| Impact Damage Detection of Toughened CFRP Laminates with Time Domain Reflectometry |
30 Jan 2013 |
13 pages |
| Authors:
Akira Todoroki; TOKYO INST OF TECH (JAPAN) DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
 | Laminated Carbon Fiber Reinforced Polymer (CFRP) composites are very effective in weight saving in aeronautical structural components. It is, however, difficult to detect damage such as delamination, matrix cracks, and local fiber breakages caused by low velocity impact loading. In the previous study in 2009, Time Domain Reflectometry (TDR) method was applied to a unidirectional laminated CFRP structure for the first time. In 2010, the research applied the TDR method ... |
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| Next Generation Structural Composite Using Surface Grown Carbon Nanotubes |
Oct 2012 |
34 pages |
| Authors:
Mahmoud R Taha; NEW MEXICO UNIV ALBUQUERQUE
|
| The goal of the project was to develop the next generation of structural composites with enhanced impact ]resistance capabilities over the current technology using carbon nanotubes (CNTs) and to understand the basic science behind this development. Our objectives included 1 ] Investigating methods to grow CNTs on the surface of carbon fabrics 2 ] Investigating methods to uniformly disperse CNTs in carbon fabrics 3 ] Investigating methods to fabricate carbon ... |
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| Multifunctional Hybrid Composites for Thermal Materials |
03 Aug 2012 |
36 pages |
| Authors:
Ajit Roy; Chris Muratore; Sergei Shenogin; Sabyasachi Ganguli; Jay Lee; Vikas Varshney; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
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| Hierarchical carbon fiber morphology for tailored thermal properties in heterogeneous materials systems was studied. Achieving the appropriate thermal interface morphology is essential Interfaces: CNT-CNT; CNT-polymer; CNT-carbon fiber. |
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| Experimental and Theoretical Studies of Carbon Nanotube Hierarchical Structures in Multifunctional Hybrid Composites |
02 Aug 2012 |
32 pages |
| Authors:
Mrinal C Saha; M C Altan; D Resasco; B P Grady; D Papavassiliou; K Mullen; A Striolo; OKLAHOMA UNIV NORMAN
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| Nanoscale reinforcement is locally segregated at the microscopic scale with controlled orientation. During this study, uniform growth of CNFs and CNTs was achieved on large carbon fabric. Catalyst loading, reaction time, catalyst deposition, and hydrogen dilution were found to affect the growth morphology. Carbon fiber with CNT showed slight increase in tensile properties and thermal conductivity at both fiber and composite levels. However, slight decrease in interfacial properties of CNT-grown ... |
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| Active Structural Fibers for Multifunctional Composite Materials |
31 Jul 2012 |
24 pages |
| Authors:
Henry A Sodano; FLORIDA UNIV GAINESVILLE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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| Fluid Structure Interaction Effects on Composites Under Low Velocity Impact |
Jun 2012 |
77 pages |
| Authors:
Ryan P Conner; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| In this study composite materials were tested in different fluid environments to determine the role of Fluid Structure Interaction with these composites under a lower velocity impact. The purpose of this research is to develop a better understanding of possible marine applications of composite materials. This was done using a low velocity impact machine and two composite types. The first composite is made from a multi-ply symmetrical plain weave 6 ... |
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| Carbon Fiber and Tungsten Disulfide Nanoscale Architectures for Armor Applications |
Jun 2012 |
121 pages |
| Authors:
Michael J Moberg; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The objective of this research was to generate shock-resistant materials based on inorganic fullerene type tungsten disulfide (IF-WS2) and carbon nanocomposite structures for personal protection armor systems. The aim was to develop a new generation of composites that combine the known energy absorbing properties of carbon nanofibers, with the shock absorbing properties reported for IF-WS2 structures. Various methods were explored to generate the desired WS2-carbon fiber composite. Experimentation revealed that ... |
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| Biobased Carbon Fibers and High-Performance Thermosetting Resins for Use in U.S. Department of Defense Applications |
Jun 2012 |
266 pages |
| Authors:
John J La Scala; Joshua Sadler; Anh-Phuong Lam; Amod Ogale; Meng Zhang; Annel Greene; Steven Chambers; III Stanzione Joseph; Richard Wool; Donghun Koo; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| Current constituent materials used to produce composites for the military are often made from both fibers and resins that are derived from petrochemical feedstocks. The use of biological resources to make advanced fibers and high-performance thermosetting resins will help reduce the dependence of military composites on the volatile cost of petroleum, thereby helping to reduce the cost of composite materials for the Department of Defense. In addition, the processes used ... |
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| Nanotailored Carbon Fibers |
27 Apr 2012 |
30 pages |
| Authors:
Han Gi Chae; NANO ENGINEERED MATERIALS CORP LAWRENCEVILLE GA
|
| Various spinning trials of polyacrylonitrile (PAN) and PAN/carbon nanotube (CNT) fibers were conducted using single- and bi-component spinning to obtain precursor fiber for carbonization. Materials parameters, such as homo- vs co-polymer, as well as different molecular weight polymers were investigated. In order to obtain better precursor fiber with circular cross-sectional shape, gelation bath composition and bath temperature were varied in the spinning process. The precursor fiber containing 0.5 to 1 ... |
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| A Finite Element Analysis of a Carbon Fiber Composite Micro Air Vehicle Wing |
22 Mar 2012 |
196 pages |
| Authors:
Theodore A Szelag; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Inaccuracies in the composite fiber orientation result in variations in the material properties. Experimental vibration data of manufactured three-ply [0/90/0] non-homogenous composite samples varied 33% from analytical results. Since the material was used in the manufacturing of a micro-air vehicle (MAV) based upon the Manduca Sexta, variance in the measured material properties and the effects on the manufacturing of the MAV wing needed to be understood. An analysis was performed ... |
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| Electromagnetic Interference Behavior of Multiwall Carbon Nanotubes and Carbon Nanofibers Composites Under Fatigue |
Mar 2012 |
151 pages |
| Authors:
Peter A Hunt; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| The United States military is researching the use of nanocomposite materials for structural applications on space vehicle systems. To reduce vehicle weight and mitigate the electromagnetic interference (EMI) brought on by the harsh space environment, today's space vehicles are made of composites coated with expensive conductive materials. Research on composites made of carbon nanotubes (CNT) and carbon nanofibers (CNF) has shown better EMI shielding performance with these materials compared to ... |
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| Verification of Accelerated Testing Methodology for Long-Term Durability of CFRP Laminates for Marine Use |
30 Jan 2012 |
78 pages |
| Authors:
Yasushi Miyano; Isao Kimpara; KANAZAWA INST OF TECHONOLOGY ISHIKAWA (JAPAN) MATERIALS SYSTEM RESEARCH LAB
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| The accelerated testing methodology (ATM) for the fatigue life prediction of CFRP laminates proposed and confirmed experimentally in the previous ONR project of Grant # N00014-01-1-0949 was verified theoretically and refined quantitatively based on the viscoelasticity of matrix resin in this ONR project. The major accomplishments of this ONR project were reported at ONR Review Meetings for Solid Mechanics Program held in September of every year at The Inn and ... |
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| An Estimation of the Potential of Carbon Fiber Reinforced Thermoplastics for Car Weight Reduction |
Nov 2011 |
7 pages |
| Authors:
Kentaro Goto; Kiyoshi Uzawa; Hideaki Murayama; Kazuro Kageyama; Keiichi Nagata; Tsuyoshi Matsuo; Jun Takahashi; TOKYO UNIV (JAPAN)
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| This paper presents an estimation of the potential for weight reduction of applying carbon fiber reinforced thermoplastics to an automotive body. More specifically, the weight change of a steel car body after a material substitution without reduction of body rigidity is evaluated. This is done by altering material properties and thickness of the selected parts of an original FEM model, LS-DYNA input file of the 1996 Dodge Neon developed by ... |
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| The Light Weight Body Structure Technologies of Lexus LFA |
Nov 2011 |
3 pages |
| Authors:
Nobuya Kawamura; TOYOTA MOTOR CORP AICHI (JAPAN)
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| Lexus LFA's CFRP body structure has been developed from the ground level within Toyota. The development team has spent countless hours on technical discussions, especially as most of the member were not experienced at all in CFRP material and manufacturing processes. This was the main reason why we have chosen to take the burden of the learning curve on our own, so that we understand better, the key characteristics of ... |
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| Off-Axis Ratcheting Behavior of Unidirectional Carbon/Epoxy Laminate under Asymmetric Cyclic Loading at High Temperature |
Nov 2011 |
6 pages |
| Authors:
Takafumi Suzuki; Masamichi Kawai; TSUKUBA UNIV IBARAKI (JAPAN)
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| Development of an engineering model for predicting the off-axis ratcheting behavior of a unidirectional CFRP laminate has been attempted. For this purpose, the ratcheting behavior of a unidirectional carbon/epoxy laminate under off-axis cyclic loading at high temperature is studied with emphasis on its dependence on load waveform (i.e. stress ratio) and fiber orientation. First, off-axis ratcheting tests with different levels of maximum and non-zero mean stresses are performed on coupon ... |
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| High Energy Advanced Thermal Storage for Spacecraft Solar Thermal Power and Propulsion Systems |
12 Oct 2011 |
22 pages |
| Authors:
David B Scharfe; Marcus P Young; Matthew R Gilpin; Rebecca Webb; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
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| Solar thermal propulsion offers a unique combination of high thrust and high specific impulse levels that can provide competitive advantages relative to traditional satellite propulsion systems. In order to enhance the functionality of this technology, thermal storage combined with a means of thermal-to-electric conversion is suggested, with the idea of providing a dual-mode power and propulsion system based on thermal energy. A system including silicon (moderate performance) or boron (high ... |
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| Low Strain Rate Failure of Compliant Flexures |
Oct 2011 |
28 pages |
| Authors:
Matthew J Santer; IMPERIAL COLL LONDON (UNITED KINGDOM) DEPT OF AERONAUTICS
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| This project investigates the time-dependent properties of thin carbon fiber composite flexures when they are held in a folded (stowed) configuration for long periods of time. The resulting behavior is shown to be complex and time dependent in an experimental program to determine the full field strain and evolution of microstructural damage. The program uses a developed experimental rig which uses digital image correlation to measure the strain behavior over ... |
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| Time Domain Reflectometry for Damage Detection of Laminated CFRP plate |
18 Aug 2011 |
|
| Authors:
Akira Todoroki; TOKYO INST OF TECH (JAPAN) DEPT OF MECHANICAL ENGINEERING
|
| Recently, high toughness Carbon Fiber Reinforced Polymer (CFRP) laminates are used to primary structures. The tough CFRP yields small fiber breakages when delamination crack is made in many cases. This requires a detection system of fiber breakages at low cost for large laminated CFRP structures. In the previous study, Time Domain Reflectometry (TDR) method is adopted for the detection of the fiber breakages of the CFRP plate. In the present ... |
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| A Two-Way Shape Change Polymeric Laminate with Fast, Large and Controllable Deformation in Response to Joule Heat |
12 AUG 2011 |
8 pages |
| Authors:
Hirohisa Tamagawa; GIFU UNIV (JAPAN)
|
| In this project a polymeric laminate composite was fabricated from a carbon fiber reinforced plastic (CFRP) plate and a polyvinylchloride (PVC). The PVC-CFRP laminate worked as a bimorph actuator. Bending behavior of the PVC-CFRP laminate was tested by fully submerging the laminate in a water bath and also changing the environmental temperature. It is observed that the PVC-CFRP laminate has a number of advantages compared to other polymer-based actuators: (i) ... |
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| Molten Boron Phase-Change Thermal Energy Storage to Augment Solar Thermal Propulsion Systems |
22 Jul 2011 |
7 pages |
| Authors:
David Scharfe; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Solar thermal propulsion offers a unique combination of high thrust and high specific impulse levels that can provide competitive advantages relative to traditional satellite propulsion systems. In order to enhance the functionality of this technology, thermal storage combined with a means of thermal-to-electric conversion is suggested, with the idea of providing a dual-mode power and propulsion system based on thermal energy. A system including boron phase change material for storing ... |
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| Molten Boron Phase-Change Thermal Energy Storage to Augment Solar Thermal Propulsion Systems |
13 Jul 2011 |
|
| Authors:
Matthew R Gilpin; David B Scharfe; Anthony P Pancotti; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Solar thermal propulsion offers a unique combination of high thrust and high specific impulse levels that can provide competitive advantages relative to traditional satellite propulsion systems. In order to enhance the functionality of this technology, thermal storage combined with a means of thermal-to-electric conversion is suggested, with the idea of providing a dual-mode power and propulsion system based on thermal energy. A system including boron phase change material for storing ... |
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| Technical Operations Support III (TOPS III). Delivery Order 0081: Novel Pitch Materials for High Thermal Conductivity Carbon Fibers, Foams and Composites - Phase 3 |
JUN 2011 |
30 pages |
| Authors:
Amod A. Ogale; CLEMSON UNIV SC
|
| The overall goal of this project was to control nanotexture of pitch precursors by the introduction nanomodifiers of different aspect ratios, thereby modifying the structure of the resulting fibers. The specific objectives were to: (i) Characterize the dispersion of nanoparticles and the microstructure of the fibers; (ii) Quantify the effect of nanomodification on fiber mechanical properties; and (iii) Develop an experimental protocol to measure and model the high thermal conductivity ... |
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| Standard Operating Procedure - Manufacture of Carbon Fibre Reinforced Plastic Waveguides and Slotted Waveguide Antennas, Version 1.0 |
Jun 2011 |
29 pages |
| Authors:
Paul J Callus; Kelvin J Nicholson; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR VEHICLES DIV
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| Slotted Waveguide Antenna Stiffened Structure (SWASS) is a type of conformal load-bearing antenna structure where the top-hat cross-section stiffeners used to reinforce thin skins, or blade stiffeners in sandwich panels, serve the dual purpose of acting both as structural stiffeners and radiofrequency waveguides. Slotted waveguide antenna arrays are created by cutting slots through the outer skin and into these waveguide stiffeners. Development of the SWASS concept requires the production and ... |
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| Enclosure Fire Tests for Understanding Aircraft Composite Fire Environments (Postprint) |
Jun 2011 |
25 pages |
| Authors:
Alexander L Brown; Amanda B Dodd; Brent M Pickett; SANDIA NATIONAL LABS ALBUQUERQUE NM
|
| Composite materials are increasingly being used in aviation applications and as the amount of composite material increases, there is a greater need to develop a better understanding of composite material response in fire environments. We have recently developed an experimental and computational program to examine this problem, with a focus on understanding duration, intensity, and the underlying physics during composite fires as well as the technology and procedures to safely ... |
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| Modeling of Failure Mechanisms in Composites With Z-Pins-Damage Validation of Z-Pin Reinforced Co-Cured Composite Laminates |
01 Apr 2011 |
25 pages |
| Authors:
Jaime Aguilar; Mauricio Barrera; Guillermo Jaramillo; CENTRO DE INVESTIGACION EN TECHNOLOGIA AERONAUTICA (CITA) CALI (COLUMBIA)
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| The Epoxy Lamina (EL) concept is introduced to explain overall stiffness reduction in Z-pin reinforced composite laminates, as reported by Zhang et al., for a typical 2%-vol fibre content. The concept is applied to a quasi-isotropic laminate, whereby both the softening and strengthening effects are separated out and quantified, based upon experimental data. This study is accompanied by a FEM-based micromechanical addressing of the composite. A set of fibre arrangements ... |
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| Split-Ring Resonator Loaded Miniaturised Slot for the Slotted Waveguide Antenna Stiffened Structure |
Mar 2011 |
8 pages |
| Authors:
Kamran Ghorbani; ROYAL MELBOURNE INST OF TECH (AUSTRALIA) SCHOOL OF ELECTRICAL AND COMPUTER SYSTEM ENGINEERING
|
| The increasing use carbon fibre reinforced polymer CFRP in modern military aircraft together with the desire for a conformal load-bearing antenna structure, has since inspired the slotted waveguide antenna stiffened structure (SWASS) concept [1]. Conventional hat stiffened or blade stiffened aircraft panels fabricated in CFRP coincidentally exhibit internal dimensions that are typical of common military waveguide bands. By machining resonant slots at half-wavelength intervals in the outer skin of the ... |
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| Cyanate Ester Resin Modified with Nano-particles for Inclusion in Continuous Fiber Reinforced Composites |
25 Feb 2011 |
58 pages |
| Authors:
Michael R Kessler; Prashanth Badrinarayanan; IOWA STATE UNIV AMES
|
| The mismatch in coefficient of thermal expansion (CTE) between the polymer matrix and low CTE carbon fibers causes development of residual stresses in polymer matrix composites (PMCs) that can lead to micro cracking and failure. This report describes the development of hybrid polymer composites comprising of a unique low viscosity bisphenol E cyanate ester resin (BECy) resin reinforced with macro scale carbon fibers and negative CTE nanoparticles. Polymer nanocomposites were ... |
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| Cyanate Ester Resin Modified with Nano-particles for Inclusion in Continuous Fiber Reinforced Composites |
25 Feb 2011 |
58 pages |
| Authors:
Michael R Kessler; Prashanth Badrinarayanan; IOWA STATE UNIV AMES
|
| The mismatch in coefficient of thermal expansion (CTE) between the polymer matrix and low CTE carbon fibers causes development of residual stresses in polymer matrix composites (PMCs) that can lead to micro cracking and failure. This report describes the development of hybrid polymer composites comprising of a unique low viscosity bisphenol E cyanate ester resin (BECy) resin reinforced with macro scale carbon fibers and negative CTE nanoparticles. Polymer nanocomposites were ... |
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| Overview of Materials R&D at Oak Ridge National Laboratory |
23 Aug 2010 |
28 pages |
| Authors:
Peter F Tortorelli; OAK RIDGE NATIONAL LAB TN MATERIALS SCIENCE AND TECHNOLOGY DIV
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| Lightweight Materials for Vehicles: Needs, Goals, and Future Technologies |
Aug 2010 |
24 pages |
| Authors:
Will Joost; DEPARTMENT OF ENERGY WASHINGTON DC
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| Performance Characterization of Polyimide-Carbon Fiber Composites for Future Hypersonic Vehicles |
Aug 2010 |
37 pages |
| Authors:
Jaime C Grunlan; K R Rajagopal; J N Reddy; TEXAS ENGINEERING EXPERIMENT STATION COLLEGE STATION
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| The US military has initiated research and development progress to develop hypersonic vehicles in the Mach 5-15 range. Two broad categories are being considered, namely: (i) vehicles that fly at low altitudes for short times (minutes) over distances of hundreds of miles and (ii) flights that are global and cover lower space orbits over periods of hours. Specifically, Air Force future vehicles need to be able to reach anywhere in ... |
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| Study of Composite Interface Strength and Crack Growth Monitoring Using Carbon Nanotubes |
Sep-2009 |
92 pages |
| Authors:
Mollie A Bily; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Interface strength of woven fabric composite layers was studied using Mode II fracture strength testing. Both carbon fiber and glass fiber composites were used with the vinyl ester resin. First, the single-step cured (i.e., co-cured) composite interface strength was compared to that of the two-step cured interface as used in the scarf joint technique. The test results showed that the two-step cured interface was as strong as the co-cured interface, ... |
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| Effectiveness of FRP in Reducing Corrosion in a Marine Environment |
Feb-2009 |
38 pages |
| Authors:
Rajan Sen; Gray Mullins; Danny Winters; K S Suh; UNIVERSITY OF SOUTH FLORIDA TAMPA
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| PROJECT GOALS: How effective is FRP in mitigating corrosion? How important is the pre-wrap repair? How feasible is it to conduct field repairs? Tests are underway to evaluate FRP's performance as a barrier. If possible, we would like to evaluate coatings that could conceivably be used to improve FRP's performance. |
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| Long Life Durability of Electrodes of Electrical Resistance Change Method for Damage Monitoring of CFRP Composite Structures |
01-Mar-2008 |
16 pages |
| Authors:
Akira Todoroki; TOKYO INST OF TECH (JAPAN) DEPT OF MECHANICAL ENGINEERING
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| Investigated the applicability of the electrical resistance change method through experiments of CFRP laminates [16-18]. Instead of using two or four electrodes, this research adopted multiple electrodes mounted on the surface of the target structure to identify delamination location and dimension. Orthotropic electric conductivity was also measured experimentally for three types of fiber volume fractions, and the paper revealed that electric conductivity in thickness direction of CFRP was approximately one ... |
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| Biomimetic Micro Air Vehicle Testing Development and Small Scale Flapping-Wing Analysis |
MAR 2008 |
114 pages |
| Authors:
Craig E. Svanberg; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS
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| The purpose of this research was to develop testing methods capable of analyzing the performance of a miniature flapping-wing mechanism that can later be adapted for the development a biomimetic flapping-wing micro air vehicle (MAV). Three small scale flapping mechanisms capable of single plane flapping, flapping with active pitch control, and flapping/pitch with out-of-plane movement were designed using SolidWorks. The flapping-only model was fabricated on an Objet 3-dimensional printer and ... |
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| Novel Concepts for Conformal Load-Bearing Antenna Structure |
01-Feb-2008 |
|
| Authors:
Paul J Callus; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR VEHICLES DIV
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 | This report describes the activities undertaken by the author during his Defence Science Fellowship on the topic of Conformal Load-bearing Antenna Structure (CLAS) at the Air Force Research Laboratory, Air Vehicles Directorate, Structures Division, Advanced Structural Concepts Branch (AFRL/VASA), Multifunctional Structures Team at the Wright Patterson Air Force Base, Ohio, USA, from June 2006 to August 2007. The aim of CLAS is to enhance the performance and capability of air ... |
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| Hybrid Helmet Cure Cycle Optimization |
FEB 2008 |
17 pages |
| Authors:
David M. Spagnuolo; Eugene Napadensky; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Some of the recent work involving the use of thermoplastic materials for combat helmets has shown significant weight savings and improved protection. Unfortunately, the change to thermoplastic materials brings with it some important concerns. First, the stiffness is compromised with these materials so a hybrid type of helmet (a thermoplastic shell with thermoset inner or outer skins) is needed to reduce the deflection properties. This brings us to the second ... |
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| The Effects of Hole-size and Environment on the Mechanical Behaviour of a Quasi-isotropic AS4/3501-6 Laminate in Tension, Compression and Bending |
NOV 2007 |
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| Authors:
Paul J. Callus; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR VEHICLES DIV
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| This report describes the results of open-hole-tension (OHT), open-hole-compression (OHC) and open-hole-four-point-bend (OHB) tests conducted on AS4/3501-6 quasi-isotropic [45/0/- 45/90]2s laminates in the room temperature dry (RTD) and elevated temperature wet (ETW) condition. Specimens were 38.1 mm wide with central through-holes ranging in diameter from 0.00 (unnotched) to 9.55 mm. The strain distribution near the hole in an OHT specimen was measured and found to agree well with that predicted ... |
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| Multifunctional Structural Composite Batteries for U.S. Army Applications |
SEP 2007 |
14 pages |
| Authors:
J. F. Snyder; R. H. Carter; K. Xu; E. I. Wong; P. A. Nguyen; E. H. Hgo; E. D. Wetzel; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This report is a reprint from the Proceedings of the 2006 Army Science Conference at Orlando, FL on 27 30 November 2006. We are developing structural polymeric composites with battery functionality. These devices both carry structural loads and store electrochemical energy. If designed with sufficient structural and energy efficiency, these materials could enable significant system-level weight reductions by replacing inert structural components while providing supplementary power for light load applications. ... |
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| Studies on Enhancing Transverse Thermal Conductivity Carbon/Carbon Composites |
06 JUL 2007 |
6 pages |
| Authors:
Lalit M. Manocha; SATISH M. MANOCHA; Ajit Roy; SOPHISTICATED INSTRUMENTS CENTER FOR APPLIED RESEARCH AND TESTING (SICART) VALLABH VIDYANAGAR (INDIA)
|
| The structure derived potential properties of Graphite such as high stiffness coupled with high thermal conductivity and low coefficient of thermal expansion have been better achieved in Carbon fibers and Carbon-Carbon composites. Consequently, the application domain of carbon-graphite based materials has increased to thermostructural components. These composites are prepared with wide range of reinforcing fibers, high strength carbon fibers to high modulus prepared from PAN, Pitch as well as CVD ... |
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| Steady-State and Dynamic Desorption of Organic Vapor From Activated Carbon With Electrothermal Swing Adsorption |
Jun-2007 |
8 pages |
| Authors:
Hamidreza Emamipour; Zaher Hashisho; Diego Cevallos; Mark J Rood; Deborah L Thurston; K J Hay; Byung J Kim; Patrick D Sullivan; ILLINOIS UNIV AT URBANA DEPT OF CIVIL AND ENVIRONMENTAL ENGINEERING
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| A new method to achieve steady-state and dynamic tracking desorption of organic compounds from activated carbon was developed and tested with a bench-scale system. Activated carbon fiber cloth (ACFC) was used to adsorb methyl ethyl ketone (MEK) from air streams. Direct electrothermal heating was then used to desorb the vapor to generate select vapor concentrations at 500 ppmv and 5000 ppmv in air. Dynamic-tracking desorption was also achieved with carefully ... |
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| The Enhancement of Composite Scarf Joint Interface Strength Through Carbon Nanotube Reinforcement |
JUN 2007 |
106 pages |
| Authors:
Randolph E. Slaff; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL AND ASTRONAUTICAL ENGINEERING
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| The objective of this research is to investigate the potentially significant improvement to scarf joint bonding achieved through the dispersion of carbon nanotubes along the interface of the composite joint. The study examines various factors that may affect carbon nanotube reinforced joint interface strength. Each composite joint consists of a vinyl-ester matrix base, DERAKANE 510-A, interlaced with a carbon fiber weave, TORAY T700CF. During the curing process the research explores ... |
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| Experimental and Numerical Analysis of a DECSMAR Structure's Deployment and Deployed Performance |
APR 2007 |
17 pages |
| Authors:
Eric L. Pollard; Thomas W. Murphey; Gregory E. Sanford; CSA ENGINEERING INC ALBUQUERQUE NM
|
| The objective of this research is to analyze the deployment and deployed performance of a recently developed, self-deployable truss architecture composed of carbon fiber reinforced plastic (CFRP) tape-spring elements and embedded shape memory alloy (SMA) flexures; this particular structural system is referred to as deployable elastic composite shape memory alloy reinforced (DECSMAR) and is representative of a concentrated, material deformation based deployable architecture. The scope of this study encompasses numerically ... |
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| Nanocomposites Derived From a Low-Color Aromatic Polyimide (CP2) and Amine-Functionalized Vapor-Grown Carbon Nanofibers: In Situ Polymerization and Characterization (Preprint) |
JAN 2007 |
55 pages |
| Authors:
David H. Wang; Michael J. Arlen; Jong-Beom Back; Richard A. Vaia; Loon-Seng Tan; DAYTON UNIV OH RESEARCH INST
|
| Vapor-grown carbon nanofibers (VGCNF) were functionalized with amine-containing pendants via a Friedel-Crafts acylation reaction with 4-(3-aminophenoxy)benzoic acid. The resulting H2N-VGCNF with ca. 5 atom% functionaliztion was in attendance during the polymerization of 2,2-bis(phtalic anhydride)-1,1,1,3,3,3-hexafluoroisopropane (6FDA) and 1,3-bis(3-aminophenoxy)benzene (APB) in N,N-dimethylacetamide (DMAc) to afford a series of polyimide (CP2)-based nanocomposite films, which contained 0.1 to 5.0 wt% of H2N-VGCNF. For comparison purposes, the pristine VGCNF (0.1-5.0 wt%) was also used in ... |
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| Multifunctional Self-Healing and Morphing Composites |
01 NOV 2006 |
9 pages |
| Authors:
T. Duenas; E. Bolanos; E. Murphy; A. Mal; F. Wudl; C. Schaffner; Y. Wang; H. T. Hahn; T. K. Ooi; A. Jha; NEXTGEN AERONAUTICS TORRANCE CA
|
| Highly innovative work towards development of a new class of materials called "Multifunctional Composites (MCs)" for multi-role structural aircraft skin applications possessing both self-healing and morphing functionality has been achieved. Proof of concept was demonstrated showing that a low volume-fraction (5-10%) of magnetic particles is sufficient for enabling self-healing of an approximate 150 micron x 5000 micron crack in a mendomer polymer using inductive heating. It was also demonstrated that ... |
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| Electrothermal Desorption of CWA Simulants from Activated Carbon Cloth |
SEP 2006 |
15 pages |
| Authors:
Patrick D. Sullivan; Joseph D. Wander; Kolin C. Newsome; AIR FORCE RESEARCH LAB TYNDALL AFB FL MATERIALS AND MANUFACTURING DIRECTORATE
|
| The use of activated carbon fabrics (ACFs) that are desorbed electrothermally, also known as the Joule effect, is explored as a potential method to create a regenerating chemical warfare agent (CWA) filter. Electrical resistance vs. temperature measurements are presented for Kynol(TM)-based ACF and compared with results for ACFs produced from toehr substrates. Adsorption and desorption results for dimethyl methylphosphonate (DMMP) demonstrate that organophosphate compounds can be effectively desorbed from ACF. ... |
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| Nano-Particle Control of Void Formation and Expansion in Polymeric and Composite Systems |
JUL 2006 |
11 pages |
| Authors:
James C. Seferis; WASHINGTON UNIV SEATTLE DEPT OF CHEMICAL ENGINEERING
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| The research focused on carbon fiber reinforced epoxy composites with varying dispersions of montmorillonite and nanoprosity, processed with either prepreg or Vacuum Resin Transfer Mold (VARTM) technologies. The most significant advancements and conclusions in this final report include interlayer modification of composites at the nanoscale and characterization of the interlayer behaviour of nanoparticles and nanoporous composites, as well as VARTM processing of nanoclay filled composites. |
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| Deployment Repeatability Testing of Composite Tape Springs for Space Optics Applications |
MAY 2006 |
15 pages |
| Authors:
Jonathan T. Black; Jeffrey A. Whetzal; Brett J. deBlonk; Jack J. Massarello; KENTUCKY UNIV LEXINGTON
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| Tape springs are of interest to the space structures community because of their high packaging ratios, ability to self-deploy, and high stiffness-to-mass ratios. The current drive to lightweight telescopes has focused mostly on decreasing the mass of the mirrors; yet decreasing the mass of the support structure may also generate significant mass savings. Here the use of carbon-fiber-composite tape springs is examined as a potential support structure of a secondary ... |
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| Manufacture and Experimental Analysis of a Concentrated Strain Based Deployable Truss Structure |
MAY 2006 |
11 pages |
| Authors:
Juan M. Mejia-Ariza; Thomas W. Murphey; Eric L. Pollard; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
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| A truss structure was built and tested to advance deployable structures technology based on the concentrated strain approach. In 3rd order hierarchy systems, this architecture has the potential to provide a 10 fold improvement in mass efficiency, and demonstrate a linear compaction ratio that is five times better than current technology. A 101.6 cm x 12.7 cm x 12.7 cm test article was fabricated, and a buckling test and analysis ... |
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| Vapor Grown Carbon Fiber/Hybrid Organic-Inorganic Matrix Composites. Nanometer-sized Silsesquiozane Phase Chemically Bound in a Matrix |
28 APR 2006 |
16 pages |
| Authors:
Jr Pittman Charles U.; MISSISSIPPI STATE UNIV MISSISSIPPI STATE DEPT OF CHEMISTRY
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| The goals of our research under AFOSR Grant number F49620-99-0191 (continued under F49620-02-0260) were to explore the preparation, properties and applications of organic matrix resin nanocomposites. The dispersed nanophases selected for this work included: (1) Polyhedral oligomeric silsesquioxane chemicals (POSS macromers) of three types: those with no polymerizable group, those with one reactive function and those with eight reactive functions. At first this included only the T8-POSS family (R8Si8O12), but ... |
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Reports by Keyword(s)
CARBON FIBERS
