| Materials Design Principles for the Dynamic Fracture of Larminar Composite Structures |
28 FEB 2006 |
84 pages |
| Authors:
Brian N. Cox; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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 | The goal of this program of basic research is to develop engineering principles for dealing with dynamic, multiple cracking damage in laminated structures, including large scale crack bridging, due to through-thickness reinforcement, and friction. Bridging and friction are treated by materials models at the smallest scales relevant to the mechanisms. By reference to the fundamentals of the dynamic growth of single cracks, which is already largely understood, simple approaches are ... |
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| High Temperature Coatings by Pulsed Electron Beam Ablation |
AUG 2005 |
44 pages |
| Authors:
Olivier Sudre; David B. Marshall; Sergio Lucato; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| The objective of this program was to investigate the deposition and properties of new high temperature coatings using pulsed-electron-beam ablation (PEBA) and to characterize the corrosion of those compounds in relevant environments. The PEBA technique has potential advantages for depositing compounds that are known to be difficult to deposit by conventional electron-beam evaporation. The use of ablation rather than melting and evaporation avoids changes in composition associated with differing evaporation ... |
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| Mathematical Fluid Dynamics of Store and Stage Separation |
MAY 2005 |
226 pages |
| Authors:
Norman D. Malmuth; V. Shalaev; A. Fedorov; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| To address the foregoing needs, the part of our research dealing with multi-body interactions we performed research to study store interaction with cavity bay shear layers relevant to separation and delivery with emphasis on the following tasks: 1. Continue combined asymptotic and numerical modeling of store separation and multibody flow processes 2. Investigate shock interactions relevant to stage separation 3. Develop combined dynamics and aerodynamic models for analysis of store ... |
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| Structured Modeling Language for Representing Active Template Libraries (Causal Modeling) |
OCT 2004 |
35 pages |
| Authors:
Yousri M. El Fattah; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| In this report we give a high-level description of the computational approach for the Causal Modeler (CModeler) tool. The tool provides a capability for capturing the cause/effect constraints in a Special Operations plan and for reasoning tasks in support of plan execution. The input to the tool is a plan created by a human planner in a mixed initiative environment using custom graphical interface (a program called SOFTools TPE) and ... |
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| High Temperature Studies of La-Monazite |
JUL 2004 |
103 pages |
| Authors:
David Marshall; Janet B. Davis; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| This report summarizes results from a 3-year research effort aimed at gaining a basic understanding of high-temperature properties of LaP04, with a view to its application in high-temperature structural composites. Previous studies at Rockwell and the Air Force established that LaP04 has a unique set of properties that make it suitable as a weakly bonded interphase material that enables damage tolerance by decoupling damage in the matrix and the reinforcing ... |
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| Dynamic Cracking and Energy Absorption in Laminates Containing Through- Thickness Reinforcement |
FEB 2004 |
177 pages |
| Authors:
Brian N. Cox; Sridhar Narayanaswamy; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| Inertial effects in the mechanism of fiber pullout were examined, with emphasis on how the rate of propagation of stress waves along the fiber, and thence the pullout dynamics, are governed by friction and the propagation of companion waves excited in the matrix. The frictional sliding between the fiber and the matrix is described by a constant interfacial friction stress, the sign of which depends on the relative particle velocity ... |
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| Corrective Measures to Restore Corrosion Resistance Following Friction Stir Welding |
2004 |
21 pages |
| Authors:
ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| Friction stir welding (FSW) is a solid state joining process invented at TWI in 1991. This technology makes it possible to join aluminum alloys, which are difficult or impossible to weld by conventional techniques.(1-7) A schematic illustration of the FSW process is shown in Figure 1. To friction stir weld either a butt or lap joint, a specially designed cylindrical tool is rotated and plunged into the joint line. The ... |
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| Incorporation of Amorphous Metals into MEMS for High Performance and Reliability |
NOV 2003 |
41 pages |
| Authors:
John R. Porter; Jeffrey DeNatale; Natalie Gluck; Daniel Branagan; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| Amorphous or amorphous derived metals have properties that can be very different from their crystalline counterparts. Since mechanisms for crystalline slip are absent, they can have high hardness and strength and exhibit high elastic strain before failure. Increasing the elastic limit of a component metal has the potential to enable the redesign of MEMS components to achieve higher performance for a given size device. To exploit these properties, Rockwell Scientific ... |
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| Micromachined Radio Frequency (RF) Switches and Tunable Capacitors for Higher Performance Secure Communications Systems |
APR 2003 |
65 pages |
| Authors:
Jeff F. DeNatale; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| The purpose of this program is to develop and demonstrate MEMS for RF communications applications. The development activities focus on two MEMS devices: RF Switches and Tunable Capacitors. The application of these components to RF subsystems offers the potential for substantial improvements in a number of performance metrics, including size, weight, power consumption, and parts count. The advantages of MEMS technology will be demonstrated in this program by insertions of ... |
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| Combined Asymptotics and Numerical Methods in Transonic Store Interactions |
FEB 2002 |
206 pages |
| Authors:
N. Malmuth; V. Shalaev; A. Fedorov; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| Combined asymptotic and numerics procedures were coupled with dynamics equations to simulate two and three-degree of freedom store separation from cavities. New solutions were obtained that provide insight into how the shear layer can interact with the body motion and cause re-contact and ricochet with the parent body. The theoretical models simulated these phenomena by adjustment of initial launch conditions such as initial plunge and pitch velocities among other lumped ... |
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| Interphase Debonding in High Temperature Ceramic Composites |
13 SEP 2001 |
136 pages |
| Authors:
David B. Marshall; Janek B. Davis; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| Studies aimed at understanding the role of the interphase in providing a nonlinear response in oxide composites are described. Debonding and sliding of single crystal and eutectic oxide fibers coated with La-monazite caused intense plastic deformation of the LaPO4 at room temperature. Such plastic deformation mechanisms could be critical for preventing the development of very high stresses during constrained sliding of rough interfaces. A new class of machinable two-phase ceramics ... |
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| Rockwell Science Center (RSC) Technologies for WDM Components |
19 Apr 2000 |
12 pages |
| Authors:
Monte Khoshnevisan; Ken Pedrotti; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
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| RSC has been a center of excellence for more than 20 years, performing R&D on components applicable to telecomm, e.g., sources, detectors, high speed microelectronics, and other components. Technology transition to former Rockwell businesses (e.g., Conexant Systems, ROK/NTSD to Alcatel), and spin-offs (e.g., Vitesse ). New RSC initiatives target R&D and business opportunities, including those related to WDM and telecomm, for military and commercial applications. |
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