Plastic deformation of a medium upon the interaction of shear shock waves

1982 ◽  
Vol 23 (2) ◽  
pp. 278-284 ◽  
Author(s):  
V. A. Baskakov
Keyword(s):  
Plastic Deformation ◽  
Shock Waves

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.

Plastic deformation behind strong shock waves

1986 ◽  
Vol 5 (1) ◽  
pp. 13-28 ◽  
Author(s):  
J. Weertman
Keyword(s):  
Plastic Deformation ◽  
Shock Waves ◽  
Strong Shock ◽  
Strong Shock Waves

Influence of spherical converging shock waves on high-rate plastic deformation of a copper single crystal

2006 ◽  
Vol 134 ◽  
pp. 889-894 ◽  
Author(s):  
A. V. Dobromyslov ◽  
N. I. Taluts ◽  
E. A. Kozlov ◽  
K. A. Schetkov
Keyword(s):  
Plastic Deformation ◽  
Shock Waves ◽  
Single Crystal ◽  
Copper Single Crystal ◽  
High Rate ◽  
Converging Shock Waves

Plastic Deformation in Shock Waves

1994 ◽  
pp. 382-447 ◽  
Keyword(s):  
Plastic Deformation ◽  
Shock Waves

Character of Plastic Deformation of WC-Co Alloys Worked by Shock Waves at High Temperatures

1989 ◽  
pp. 1001-1006
Author(s):  
A. Peikrishvili ◽  
E. Kutelia ◽  
G. Gotsiridze
Keyword(s):  
Plastic Deformation ◽  
Shock Waves ◽  
High Temperatures ◽  
Co Alloys

Plastic deformation and microstructural transformation of metals in shock waves

1983 ◽  
Vol 19 (5) ◽  
pp. 645-647 ◽  
Author(s):  
P. V. Makarov ◽  
T. M. Platova ◽  
V. A. Skripnyak
Keyword(s):  
Plastic Deformation ◽  
Shock Waves ◽  
Microstructural Transformation

scholarly journals Molecular Dynamics Investigation of the Influence of Voids on the Impact Mechanical Behavior of NiTi Shape-Memory Alloy

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4020
Author(s):  
Zhenwei Wu ◽  
Xiang Chen ◽  
Tao Fu ◽  
Hengwei Zheng ◽  
Yang Zhao
Keyword(s):  
Shock Wave ◽  
Molecular Dynamics ◽  
Plastic Deformation ◽  
Phase Transformation ◽  
Shape Memory Alloy ◽  
Shock Waves ◽  
Mechanical Behavior ◽  
Shape Memory ◽  
Wave Front ◽  
Niti Sma

To date, research on the physical and mechanical behavior of nickel-titanium shape-memory alloy (NiTi SMA) has focused on the macroscopic physical properties, equation of state, strength constitution, phase transition induced by temperature and stress under static load, etc. The behavior of a NiTi SMA under high-strain-rate impact and the influence of voids have not been reported. In this present work, the behavior evolution of (100) single-crystal NiTi SMA and the influencing characteristics of voids under a shock wave of 1.2 km/s are studied by large-scale molecular dynamics calculation. The results show that only a small amount of B2 austenite is transformed into B19’ martensite when the NiTi sample does not pass through the void during impact compression, whereas when the shock wave passes through the hole, a large amount of martensite phase transformation and plastic deformation is induced around the hole; the existence of phase transformation and phase-transformation-induced plastic deformation greatly consumes the energy of the shock wave, thus making the width of the wave front in the subsequent propagation process wider and the peak of the foremost wave peak reduced. In addition, the existence of holes disrupts the orderly propagation of shock waves, changes the shock wave front from a plane to a concave surface, and reduces the propagation speed of shock waves. The calculation results show that the presence of pores in a porous NiTi SMA leads to significant martensitic phase transformation and plastic deformation induced by phase transformation, which has a significant buffering effect on shock waves. The results of this study provide great guidance for expanding the application of NiTi SMA in the field of shock.

Mechanism of Compressive Residual Stress Introduction on Surfaces of Metal Materials by Water-Jet Peening

2010 ◽  
Author(s):  
Ryo Ishibashi ◽  
Hisamitsu Hato ◽  
Fujio Yoshikubo
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Shock Waves ◽  
Power Plants ◽  
Compressive Residual Stress ◽  
Water Jet ◽  
Pulse Load ◽  
Depth Profiles ◽  
Impact Processes ◽  
The Impact

Water-jet peening (WJP) has been applied to several Japanese nuclear power plants as a method of preventive maintenance against stress corrosion cracking. WJP introduces compressive residual stress reaching hundreds of micrometers in depth, comparable with shot peening (SP), and much smaller plastic deformation at the processed surfaces than SP does. The causes of these features are investigated from the perspective of the impact processes on the surfaces. Pulse-load propagation simulation through elasto-plastic calculations using a finite-element method program was applied to analyze the effects of various parameters of the impact processes on the depth profiles of the residual stress and the amount of plastic deformation on the surface of austenitic stainless steels processed with either WJP or the SP. The calculated depth profiles of residual stress and plastic deformation were similar in some degree to the experimental results of an XRD residual-stress analysis and a plastic-strain analysis using both cross-sectional hardness measurements and EBSD analysis. The analysis reveals that the depth of the compressive residual stress tends to increase as the size of the loaded spot during impact increases. The average and maximum observed load spots using WJP were 0.25 and 0.95 mm in diameter, respectively. These diameters were respectively 1.3 and 4.8 times as large as the calculated diameter of a load spot using SP. The reason that the depth of the compressive residual stress using WJP is comparable with that using SP is considered to be the fact that the sizes of the load spots during the impact with WJP are in the same range as those with SP. Shots impact the surface during the SP process, while shock waves generated by the extinction of cavitations impact the surface during the WJP process. The analysis reveals that the shots deform the surface locally with much higher surface pressure in the early stages of the impact, while shock waves deform the surface evenly throughout the wave passage across the surface. It is inferred from these analyzed results that the media impacting the surface make a difference in the hardness and microstructure of the processed surface.

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