| Modeling the Tagged-Neutron UXO Identification Technique Using the Geant4 Toolkit |
Jan 2011 |
7 pages |
| Authors:
Y Zhou; X Zhu; Y Wang; S Mitra; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
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 | It is proposed to use 14 MeV neutrons tagged by the associated particle neutron time-of-flight technique (APnTOF) to identify the fillers of unexploded ordnances (UXO) by characterizing their carbon, nitrogen and oxygen contents. To facilitate the design and construction of a prototype system, a preliminary simulation model was developed, using the Geant4 toolkit. This work established the toolkit environment for (a) generating tagged neutrons (b) their transport and interactions within ... |
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| Experimental Micromechanics Study of Lamellar TiA1 |
15 FEB 2007 |
25 pages |
| Authors:
Fu-Pen Chiang; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
|
| A unique micro-scale full field deformation measurement technique called electron speckle photography is exploited to investigate the deformation mechanism of lamellar TiAl. We find the size of the specimen used and the area of strain measurement affect the mechanical properties thus obtained. The strain distribution inside a grain is highly heterogeneous. The grain boundary is much stiffer than the interior of the grain. We also observe several interesting phenomena of ... |
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| On the Stability of Higher-Order Continuum (HOC) Equations for Hybrid HOC/DSMC Solvers |
13 JUL 2005 |
7 pages |
| Authors:
Foluso Ladeinde; Xiaodan Cai; Ramesh Agarwal; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
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| Our interest in the stability analysis of the high-order continuum (HOC) equations is motivated by the relevance to the development of a hybrid method combining such equations with the Direct Simulation Monte-Carlo (DSMC) technique for the computation of hypersonic flows in all regimes continuum, transition, and rarefied. The hybrid approach allows the effects of thermophysics (thermal and chemical non-equilibrium) and turbulence to be included much more easily than in other ... |
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| Investigating the Effect of Displacement Rate on Deformation and Failure Mechanism in Bonded Elastomers |
JUL 2005 |
7 pages |
| Authors:
Fu-Pen Chiang; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
|
| Bonded sandwich laminates are being used widely in various industries. They have been successfully used in aircraft and space structures, pipes, chemical tanks, ship hulls, and in other structural applications in which a high strength-to-weight ratio is a desirable feature. Joining structural components with adhesives provides a number of advantages. Bonding does not require rivet holes, which are stress raisers and may cause premature failure either under static or fatigue ... |
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| Student Augmentation for Crystal Growth Research |
MAY 1999 |
7 pages |
| Authors:
Vishwanath Prasad; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
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| Three graduate students and one undergraduate student were supported to pursue research in the area of crystal growth and complement the research activities of AFOSR/DARPA MURI project on integrated intelligent modeling, design and control of crystal growth processes. One doctoral student worked on integrating the radiation heat transfer model into MASTRAPP, the crystal growth model developed by the Consortium for Crystal Growth Research. He also built a parallel processing algorithm. ... |
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| Characterization of Mechanical Properties of Interphase in Glass/ Polyester Composite System |
DEC 1997 |
27 pages |
| Authors:
Fu Pen Chiang; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
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| A bimaterial pair consisting of homopolymers PMMA (polymethylmethacrylate) and PS (polystyrene) was selected for this study. A graft copolymer was used to bind the two homopolymers together. Instead of the conventional asymmetric double cantilever beam test we selected the asymmetric four-point-bend test scheme to evaluate the bimaterial system, because the latter can be employed to evaluate the effect of mode mixity. The mechanical properties of PMMA and PS are quite ... |
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| Load Transfer, Interface Characterization and Toughening Mechanism of Composites |
MAR 97 |
68 pages |
| Authors:
Fu-Pen Chiang; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
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| A Micromechanics Measurement Technique called SIEM (Speckle Interferometry with Electron Microscopy) has been developed which has a spatial resolution of 10(exp -6) m and a displacement resolution of 10(exp-9) m. It utilizes a random pattern of submicron particles as markers on a specimen. Their movements under load are used for displacement/strain calculations through a correlation scheme. It has been successfully applied to the determination of the mechanical property of composite ... |
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| Dynamic Failure Modes for Fluid-Pressure Loaded Composite Shells |
NOV 96 |
7 pages |
| Authors:
Alan S. Kushner; Toshio Nakamura; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
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| Specialized tools have been developed to elucidate the fundamental mechanisms driving the interaction between delamination crack tip conditions and local and global buckling modes in two dimensional problems of compressively loaded composite flat panels and cylindrical shells. Significant progress was made in understanding the interplay between the energy going into the fracture process and the structural deformation modes. For flat composite panels subjected to compressive loadings, it was found that ... |
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| Workstation for Process Animation and Video Analysis |
31 DEC 95 |
2 pages |
| Authors:
Vishwanath Pradas; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
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| As proposed, the infrastructure for computation, process animation and graphical analysis has been greatly improved by acquiring new equipment in the Process Modeling Laboratory. A silicon Graphics Indigo 2 workstation with enhanced RAM and storage capability, a Tektronix Dye-sublimation Color Printer (Model Phaser 440) and two SUN X-terminals together with many other peripheral devices were purchased from this grant. Special software have been acquired to create process animation videos and ... |
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| Probability Methods for the Fracture of Composite Materials. |
1994 |
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| Authors:
Robert C. Wetherhold; Anthony M. Ucci; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
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 | The reliability calculation for a composite material may be performed using a variety of approximation methods. these methods are broadly divided into fast probability intergration (fpi) methods of either first or second order, and the monte carlo based simulation methods. using the tsai-hill and tsai-wu failure criteria as examples, these methods are described and illustrated. the methods are compared for accuracy, difficulty of implementation, and sensitivity to uncertainty in the ... |
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| Trajectory Pattern Method Applied to a Turreted Weapon System. |
SEP 1993 |
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| Authors:
J. Rastegar; Q. Tu; F. Khorrami; M. Mattice; N. Coleman; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
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| The U.S. Army has built a test fixture called ATB1000 which emulates the types of nonlinearities and flexibilities found on most lightweight turreted weapon systems. In this study, the Trajectory Pattern Method is used to synthesize motion trajectories and generate inverse dynamics model based feedforward actuating signals for the test fixture. The main contribution of the present study is the derivation of the inverse dynamics model of the system in ... |
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| Development of CASI (Computer Aided Speckle Interferometry) and LSS (laser Speckle Sensor) with Application to Material Response under High Strain Rate, High Temperature, Vibration and Fatigue |
10 FEB 91 |
334 pages |
| Authors:
F. P. Chiang; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MECHANICAL ENGINEERING
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| Two noncontact, remote sensing experimental mechanics techniques using laser speckle are developed. CASI (Computer Aided Speckle Interferometry) is a full field method whereby the speckle formed on the entire specimen surface is captured by a CCD camera and digitally processed to yield stress/strain data. It has been applied to the study of gun oscillation during firing and high strain rate material testing under high temperature and high heating rate. LSS ... |
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