The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Michael Ortiz - One of the best experts on this subject based on the ideXlab platform.
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elastic response of water filled fiber composite tubes under shock Wave Loading
International Journal of Solids and Structures, 2013Co-Authors: L. E. Perotti, Ralf Deiterding, Kasuaki Inaba, J E Shepherd, Michael OrtizAbstract:We experimentally and numerically investigate the response of fluid-filled filament-wound composite tubes subjected to axial shock Wave Loading in water. Our study focuses on the fluid–structure interaction occurring when the shock Wave in the fluid propagates parallel to the axis of the tube, creating pressure Waves in the fluid coupled to flexural Waves in the shell. The in-house-developed computational scheme couples an Eulerian fluid solver with a Lagrangian shell solver, which includes a new and simple material model to capture the response of fiber composites in finite kinematics. In the experiments and simulations we examine tubes with fiber winding angles equal to 45° and 60°, and we measure the precursor and primary Wave speeds, hoop and longitudinal strains, and pressure. The experimental and computational results are in agreement, showing the validity of the computational scheme in complex fluid–structure interaction problems involving fiber composite materials subjected to shock Waves. The analyses of the measured quantities show the strong coupling of axial and hoop deformations and the significant effect of fiber winding angle on the composite tube response, which differs substantially from that of a metal tube in the same configuration.
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Elastic response of water-filled fiber composite tubes under shock Wave Loading
International Journal of Solids and Structures, 2013Co-Authors: L. E. Perotti, Koichi Inaba, J Shepherd, Ralf Deiterding, Michael OrtizAbstract:We experimentally and numerically investigate the response of fluid-filled filament-wound composite tubes subjected to axial shock Wave Loading in water. Our study focuses on the fluid-structure interaction occurring when the shock Wave in the fluid propagates parallel to the axis of the tube, creating pressure Waves in the fluid coupled to flexural Waves in the shell. The in-house-developed computational scheme couples an Eulerian fluid solver with a Lagrangian shell solver, which includes a new and simple material model to capture the response of fiber composites in finite kinematics. In the experiments and simulations we examine tubes with fiber winding angles equal to 45° and 60°, and we measure the precursor and primary Wave speeds, hoop and longitudinal strains, and pressure. The experimental and computational results are in agreement, showing the validity of the computational scheme in complex fluid-structure interaction problems involving fiber composite materials subjected to shock Waves. The analyses of the measured quantities show the strong coupling of axial and hoop deformations and the significant effect of fiber winding angle on the composite tube response, which differs substantially from that of a metal tube in the same configuration. © 2012 Elsevier Ltd. All rights reserved.
L. E. Perotti - One of the best experts on this subject based on the ideXlab platform.
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elastic response of water filled fiber composite tubes under shock Wave Loading
International Journal of Solids and Structures, 2013Co-Authors: L. E. Perotti, Ralf Deiterding, Kasuaki Inaba, J E Shepherd, Michael OrtizAbstract:We experimentally and numerically investigate the response of fluid-filled filament-wound composite tubes subjected to axial shock Wave Loading in water. Our study focuses on the fluid–structure interaction occurring when the shock Wave in the fluid propagates parallel to the axis of the tube, creating pressure Waves in the fluid coupled to flexural Waves in the shell. The in-house-developed computational scheme couples an Eulerian fluid solver with a Lagrangian shell solver, which includes a new and simple material model to capture the response of fiber composites in finite kinematics. In the experiments and simulations we examine tubes with fiber winding angles equal to 45° and 60°, and we measure the precursor and primary Wave speeds, hoop and longitudinal strains, and pressure. The experimental and computational results are in agreement, showing the validity of the computational scheme in complex fluid–structure interaction problems involving fiber composite materials subjected to shock Waves. The analyses of the measured quantities show the strong coupling of axial and hoop deformations and the significant effect of fiber winding angle on the composite tube response, which differs substantially from that of a metal tube in the same configuration.
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Elastic response of water-filled fiber composite tubes under shock Wave Loading
International Journal of Solids and Structures, 2013Co-Authors: L. E. Perotti, Koichi Inaba, J Shepherd, Ralf Deiterding, Michael OrtizAbstract:We experimentally and numerically investigate the response of fluid-filled filament-wound composite tubes subjected to axial shock Wave Loading in water. Our study focuses on the fluid-structure interaction occurring when the shock Wave in the fluid propagates parallel to the axis of the tube, creating pressure Waves in the fluid coupled to flexural Waves in the shell. The in-house-developed computational scheme couples an Eulerian fluid solver with a Lagrangian shell solver, which includes a new and simple material model to capture the response of fiber composites in finite kinematics. In the experiments and simulations we examine tubes with fiber winding angles equal to 45° and 60°, and we measure the precursor and primary Wave speeds, hoop and longitudinal strains, and pressure. The experimental and computational results are in agreement, showing the validity of the computational scheme in complex fluid-structure interaction problems involving fiber composite materials subjected to shock Waves. The analyses of the measured quantities show the strong coupling of axial and hoop deformations and the significant effect of fiber winding angle on the composite tube response, which differs substantially from that of a metal tube in the same configuration. © 2012 Elsevier Ltd. All rights reserved.
Ralf Deiterding - One of the best experts on this subject based on the ideXlab platform.
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elastic response of water filled fiber composite tubes under shock Wave Loading
International Journal of Solids and Structures, 2013Co-Authors: L. E. Perotti, Ralf Deiterding, Kasuaki Inaba, J E Shepherd, Michael OrtizAbstract:We experimentally and numerically investigate the response of fluid-filled filament-wound composite tubes subjected to axial shock Wave Loading in water. Our study focuses on the fluid–structure interaction occurring when the shock Wave in the fluid propagates parallel to the axis of the tube, creating pressure Waves in the fluid coupled to flexural Waves in the shell. The in-house-developed computational scheme couples an Eulerian fluid solver with a Lagrangian shell solver, which includes a new and simple material model to capture the response of fiber composites in finite kinematics. In the experiments and simulations we examine tubes with fiber winding angles equal to 45° and 60°, and we measure the precursor and primary Wave speeds, hoop and longitudinal strains, and pressure. The experimental and computational results are in agreement, showing the validity of the computational scheme in complex fluid–structure interaction problems involving fiber composite materials subjected to shock Waves. The analyses of the measured quantities show the strong coupling of axial and hoop deformations and the significant effect of fiber winding angle on the composite tube response, which differs substantially from that of a metal tube in the same configuration.
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Elastic response of water-filled fiber composite tubes under shock Wave Loading
International Journal of Solids and Structures, 2013Co-Authors: L. E. Perotti, Koichi Inaba, J Shepherd, Ralf Deiterding, Michael OrtizAbstract:We experimentally and numerically investigate the response of fluid-filled filament-wound composite tubes subjected to axial shock Wave Loading in water. Our study focuses on the fluid-structure interaction occurring when the shock Wave in the fluid propagates parallel to the axis of the tube, creating pressure Waves in the fluid coupled to flexural Waves in the shell. The in-house-developed computational scheme couples an Eulerian fluid solver with a Lagrangian shell solver, which includes a new and simple material model to capture the response of fiber composites in finite kinematics. In the experiments and simulations we examine tubes with fiber winding angles equal to 45° and 60°, and we measure the precursor and primary Wave speeds, hoop and longitudinal strains, and pressure. The experimental and computational results are in agreement, showing the validity of the computational scheme in complex fluid-structure interaction problems involving fiber composite materials subjected to shock Waves. The analyses of the measured quantities show the strong coupling of axial and hoop deformations and the significant effect of fiber winding angle on the composite tube response, which differs substantially from that of a metal tube in the same configuration. © 2012 Elsevier Ltd. All rights reserved.
Joanna Austin - One of the best experts on this subject based on the ideXlab platform.
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collapse of void arrays under stress Wave Loading
Journal of Fluid Mechanics, 2010Co-Authors: Andrew B Swantek, Joanna AustinAbstract:The interaction of an array of voids collapsing after passage of a stress Wave is studied as a model problem relevant to porous materials, for example, to energy localization leading to hotspot formation in energetic materials. Dynamic experiments are designed to illuminate the hydrodynamic processes of collapsing void interactions for eventual input into device-scale initiation models. We examine a stress Wave Loading representative of accidental mechanical insult, for which the Wave passage length scale is comparable with the void and inter-void length scales. A single void, two-void linear array, and a four-void staggered array are studied. Diagnostic techniques include high-speed imaging of cylindrical void collapse and the first particle image velocimetry measurements in the surrounding material. Voids exhibit an asymmetrical collapse process, with the formation of a high-speed internal jet. Volume and diameter versus time data for single void collapse under stress Wave Loading are compared with literature results for single voids under shock-Wave Loading. The internal volume history does not fall on a straight line and is in agreement with simulations, but in contrast to existing linear experimental data fits. The velocity field induced in the surrounding material is measured to quantify a region of influence at selected stages of single void collapse. In the case of multiple voids, the stress Wave diffracts in response to the presence of the upstream void, affecting the Loading condition on the downstream voids. Both collapse-inhibiting (shielding) and collapse-triggering effects are observed.
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effect of Loading Wave profile on hydrodynamic void collapse in detonation initiation
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010Co-Authors: Andrew B Swantek, Ratnesh K Shukla, Joanna AustinAbstract:We experimentally and numerically investigate void collapse as a mechanism for detonation initiation in porous energetic materials under a stress-Wave Loading condition, representative of accidental mechanical insult. In contrast to the step Loading of a shock, a stress Wave induces a ramp Loading, where length scales of the Wave may be comparable to the void size. Using an inert and transparent polymer material, we decouple the reactive and material aspects of void collapse, and focus instead on the hydrodynamic process of interactive void collapse. Diagnostic techniques include high speed shadowgraph movies of the collapsing voids and particle image velocimetry in the surrounding material. Two dimensional finite volume simulations compare the interaction of a single void undergoing ramp and shock Wave Loading. Voids exhibit asymmetric collapse, with formation of a high speed jet that originates from proximal wall of the void. Data obtained, including internal volume histories and collapse times of current experiments and simulations, are reported and compared with shock-induced cavity collapse data from the literature.
Q An - One of the best experts on this subject based on the ideXlab platform.
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dynamic response of phenolic resin and its carbon nanotube composites to shock Wave Loading
Journal of Applied Physics, 2011Co-Authors: Bedri Arman, Q An, Tapan Desai, D L Tonks, Tahir Cagin, William A GoddardAbstract:We investigate with nonreactive molecular dynamics simulations the dynamic response of phenolic resin and its carbon-nanotube CNT composites to shock Wave compression. For phenolic resin, our simulations yield shock states in agreement with experiments on similar polymers except the “phase change” observed in experiments, indicating that such phase change is chemical in nature. The elastic–plastic transition is characterized by shear stress relaxation and atomic-level slip, and phenolic resin shows strong strain hardening. Shock Loading of the CNT-resin composites is applied parallel or perpendicular to the CNT axis, and the composites demonstrate anisotropy in Wave propagation, yield and CNT deformation. The CNTs induce stress concentrations in the composites and may increase the yield strength. Our simulations suggest that the bulk shock response of the composites depends on the volume fraction, length ratio, impact cross-section, and geometry of the CNT components; the short CNTs in current simulations have insignificant effect on the bulk response of resin polymer. © 2011 American Institute of Physics. doi:10.1063/1.3524559
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shock Wave Loading and spallation of copper bicrystals with asymmetric σ3 110 tilt grain boundaries
Journal of Applied Physics, 2010Co-Authors: Timothy C Germann, Davis L Tonks, Q AnAbstract:We investigate the effect of asymmetric grain boundaries (GBs) on the shock response of Cu bicrystals with molecular dynamics simulations. We choose a representative Σ3〈110〉tilt GB type, (110)_1/(114)_2, and a grain size of about 15 nm. The shock Loading directions lie on the GB plane and are along [001] and [221] for the two constituent crystals. The bicrystal is characterized in terms of local structure, shear strain, displacement, stress and temperature during shock compression, and subsequent release and tension. The shock response of the bicrystal manifests pronounced deviation from planar Loading as well as strong stress and strain concentrations, due to GBs and the strong anisotropy in elasticity and plasticity. We explore incipient to full spallation. Voids nucleate either at GBs or on GB-initiated shear planes, and the spall damage also depends on grain orientation.
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melting of cu under hydrostatic and shock Wave Loading to high pressures
Journal of Physics: Condensed Matter, 2008Co-Authors: Q An, Lianqing Zheng, Oliver TschaunerAbstract:Molecular dynamics simulations are performed to investigate hydrostatic melting and shock-induced melting of single crystal Cu described by an embedded-atom method potential. The thermodynamic (equilibrium) melting curve obtained from our simulations agrees with static experiments and independent simulations. The planar solid–liquid interfacial energy is found to increase with pressure. The amount of maximum superheating or supercooling is independent of pressure, and is 1.24 ± 0.01 and 0.68 ± 0.01 at a heating or cooling rate of 1 K ps−1, respectively. We explore shock Loading along three main crystallographic directions: , and . Melting along the principal Hugoniot differs considerably from and , possibly due to different extents of solid state disordering. Along , the solid is superheated by about 20%, before it melts with a pronounced temperature drop. In contrast, melting along and is quasi-continuous, and premelting (~7%) is observed.
