Homogeneous relaxation and shock wave problems: Assessment of the simplified and generalized Bernoulli trial collision schemes

2021 ◽  
Vol 33 (3) ◽  
pp. 032004
Author(s):  
Ahmad Shoja-Sani ◽  
Ehsan Roohi ◽  
Stefan Stefanov
Keyword(s):  
Shock Wave ◽  
Bernoulli Trial ◽  
Wave Problems

Numerical Simulation on Embedded Steel Frame Concrete Blast Wall Resisting Air Shock Wave

2014 ◽  
Vol 548-549 ◽  
pp. 1763-1767
Author(s):  
Hai Jun Wang ◽  
Yong Yao ◽  
Zhao Qiang Zhang ◽  
Xiao Pan Yang ◽  
Yu Ping Zhu
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Blast Wave ◽  
Steel Frame ◽  
Wave Load ◽  
Air Blast ◽  
Explicit Finite Element ◽  
Finite Element Software ◽  
Explosion Load ◽  
Wave Problems

Embedded steel frame concrete blast walls can effectively counteract and dissipation the air-blast wave of the explosion. By contrast widely recognized air-blast wave empirical formula to verify the feasibility of the method of explosion load simplify model numerical simulation calculate the shock wave problems by using the explicit finite element software ANSYS/LS-DYNA and keywords *LOAD_BLAST. Obtained, The results of simplified explosion shock wave load by *load_blast have small difference with the actual explosion model; The destruction of the wall are mainly shear and brittle failure; The ability of Embedded steel frame blast wall resist air-blast wave significantly greater than other wall.

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.

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