Influence of diaphragm properties on shock wave transmission

Shock Waves ◽  
2005 ◽  
pp. 801-806 ◽  
Author(s):  
S. B. Murray ◽  
F. Zhang ◽  
K. B. Gerrard ◽  
P. Guillo ◽  
R. C. Ripley
Keyword(s):  
Shock Wave ◽  
Wave Transmission

Detonation-to-shock wave transmission at a contact discontinuity

Shock Waves ◽  
2018 ◽  
Vol 28 (5) ◽  
pp. 981-992 ◽  
Author(s):  
J. T. Peace ◽  
F. K. Lu
Keyword(s):  
Shock Wave ◽  
Contact Discontinuity ◽  
Wave Transmission

Properties of Shoe Insert Materials Related to Shock Wave Transmission During Gait

1995 ◽  
Vol 16 (12) ◽  
pp. 778-786 ◽  
Author(s):  
Arturo Forner ◽  
Ana-Cruz García ◽  
Enrique Alcántara ◽  
José Ramiro ◽  
Juan-Víctor Hoyos ◽  
...  
Keyword(s):  
Shock Wave ◽  
Loss Tangent ◽  
Mechanical Characteristics ◽  
Wave Transmission ◽  
Heel Strike ◽  
High Loss ◽  
Selection Of

The influence of the mechanical characteristics of certain insole materials in the generation and transmission of heel strike impacts while walking was studied. Three insole materials were selected according to their mechanical characteristics under heel strike impacts. The selection of materials has made it possible to distinguish the effect of rigidity and loss tangent in the transmission of heel strike impacts. A lower rigidity and a high loss tangent have been shown to reduce the transmission of impacts to the tibia. A low rigidity was seen to significantly increase the transmission of impacts from tibia to forehead.

Atomistic investigation of phase transition in solid argon induced by shock wave transmission

2013 ◽  
Vol 86 (8) ◽  
pp. 838-853 ◽  
Author(s):  
Maryam Mahnama ◽  
Reza Naghdabadi ◽  
Mohammad Reza Movahhedy
Keyword(s):  
Phase Transition ◽  
Shock Wave ◽  
Wave Transmission ◽  
Solid Argon

scholarly journals Experimental and Numerical Investigation of the Mechanism of Blast Wave Transmission Through a Surrogate Head

2014 ◽  
Vol 9 (3) ◽  
Author(s):  
Yi Hua ◽  
Praveen Kumar Akula ◽  
Linxia Gu ◽  
Jeff Berg ◽  
Carl A. Nelson
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
Numerical Model ◽  
Shock Tube ◽  
Blast Wave ◽  
Wave Transmission ◽  
Surface Strain ◽  
Transmission Mechanisms ◽  
Blast Wave Propagation ◽  
The Brain

This work is to develop an experiment-validated numerical model to elucidate the wave transmission mechanisms through a surrogate head under blast loading. Repeated shock tube tests were conducted on a surrogate head, i.e., water-filled polycarbonate shell. Surface strain on the skull simulant and pressure inside the brain simulant were recorded at multiple locations. A numerical model was developed to capture the shock wave propagation within the shock tube and the fluid-structure interaction between the shock wave and the surrogate head. The obtained numerical results were compared with the experimental measurements. The experiment-validated numerical model was then used to further understand the wave transmission mechanisms from the blast to the surrogate head, including the flow field around the head, structural response of the skull simulant, and pressure distributions inside the brain simulant. Results demonstrated that intracranial pressure in the anterior part of the brain simulant was dominated by the direct blast wave propagation, while in the posterior part it was attributed to both direct blast wave propagation and skull flexure, which took effect at a later time. This study served as an exploration of the physics of blast-surrogate interaction and a precursor to a realistic head model.

A new type of defect structure in 124-superconducting oxide revealed by HREM

1991 ◽  
Vol 49 ◽  
pp. 1092-1093
Author(s):  
R. Sharma ◽  
B.L. Ramakrishna ◽  
N.N. Thadhani ◽  
D. Hianes ◽  
Z. Iqbal
Keyword(s):  
Shock Wave ◽  
Defect Structure ◽  
Neutron Radiation ◽  
Weak Links ◽  
Defect Structures ◽  
New Materials ◽  
New Type ◽  
Current Densities ◽  
Processing Techniques ◽  
Microstructural Studies

After materials with superconducting temperatures higher than liquid nitrogen have been prepared, more emphasis has been on increasing the current densities (Jc) of high Tc superconductors than finding new materials with higher transition temperatures. Different processing techniques i.e thin films, shock wave processing, neutron radiation etc. have been applied in order to increase Jc. Microstructural studies of compounds thus prepared have shown either a decrease in gram boundaries that act as weak-links or increase in defect structure that act as flux-pinning centers. We have studied shock wave synthesized Tl-Ba-Cu-O and shock wave processed Y-123 superconductors with somewhat different properties compared to those prepared by solid-state reaction. Here we report the defect structures observed in the shock-processed Y-124 superconductors.

Investigation of shock-wave deformation history from recovered structure

1986 ◽  
Vol 44 ◽  
pp. 434-435
Author(s):  
M.A. Mogilevsky ◽  
L.S. Bushnev
Keyword(s):  
Shock Wave ◽  
Plastic Deformation ◽  
Dislocation Density ◽  
Shock Waves ◽  
Shock Front ◽  
Single Crystals ◽  
Residual Deformation ◽  
Deformation Structure ◽  
Deformation History ◽  
Deformation Velocity

Single crystals of Al were loaded by 15 to 40 GPa shock waves at 77 K with a pulse duration of 1.0 to 0.5 μs and a residual deformation of ∼1%. The analysis of deformation structure peculiarities allows the deformation history to be re-established.After a 20 to 40 GPa loading the dislocation density in the recovered samples was about 1010 cm-2. By measuring the thickness of the 40 GPa shock front in Al, a plastic deformation velocity of 1.07 x 108 s-1 is obtained, from where the moving dislocation density at the front is 7 x 1010 cm-2. A very small part of dislocations moves during the whole time of compression, i.e. a total dislocation density at the front must be in excess of this value by one or two orders. Consequently, due to extremely high stresses, at the front there exists a very unstable structure which is rearranged later with a noticeable decrease in dislocation density.

Electron microscopy study of shock synthesis of silicides

1993 ◽  
Vol 51 ◽  
pp. 1162-1163
Author(s):  
Kenneth S. Vecchio
Keyword(s):  
Shock Wave ◽  
Plastic Deformation ◽  
Close Contact ◽  
Microscopy Study ◽  
High Energy ◽  
Electron Microscopy Study ◽  
Powder Materials ◽  
Porous Powder ◽  
Wave Effects ◽  
Wave Passage

Shock-induced reactions (or shock synthesis) have been studied since the 1960’s but are still poorly understood, partly due to the fact that the reaction kinetics are very fast making experimental analysis of the reaction difficult. Shock synthesis is closely related to combustion synthesis, and occurs in the same systems that undergo exothermic gasless combustion reactions. The thermite reaction (Fe2O3 + 2Al -> 2Fe + Al2O3) is prototypical of this class of reactions. The effects of shock-wave passage through porous (powder) materials are complex, because intense and non-uniform plastic deformation is coupled with the shock-wave effects. Thus, the particle interiors experience primarily the effects of shock waves, while the surfaces undergo intense plastic deformation which can often result in interfacial melting. Shock synthesis of compounds from powders is triggered by the extraordinarily high energy deposition rate at the surfaces of the powders, forcing them in close contact, activating them by introducing defects, and heating them close to or even above their melting temperatures.

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