Dynamic evolution of microstructure during laser shock loading and spall failure of single crystal Al at the atomic scales

2018 ◽  
Vol 124 (20) ◽  
pp. 205901 ◽  
Author(s):  
Sergey Galitskiy ◽  
Dmitry S. Ivanov ◽  
Avinash M. Dongare
Keyword(s):  
Single Crystal ◽  
Shock Loading ◽  
Dynamic Evolution ◽  
Laser Shock ◽  
Evolution Of Microstructure ◽  
Spall Failure

Dynamic Evolution of Defect Structures during Spall Failure of Nanocrystalline Al

MRS Advances ◽  
2016 ◽  
Vol 1 (58) ◽  
pp. 3853-3858
Author(s):  
Kathleen Coleman ◽  
Garvit Agarwal ◽  
Avinash M. Dongare
Keyword(s):  
Shock Loading ◽  
Spall Strength ◽  
Dynamic Evolution ◽  
Defect Structures ◽  
Deformation And Failure ◽  
Average Grain Size ◽  
Initial Shock ◽  
Dynamics Simulations ◽  
20 Nm ◽  
Spall Failure

ABSTRACTThe dynamic evolution and interaction of defects under the conditions of shock loading in nanocrystalline Al with an average grain size of 20 nm is investigated using molecular dynamics simulations for an impact velocity of 1 km/s. Four stages of defect evolution are identified during shock deformation and failure that correspond to the initial shock compression (I), the propagation of the compression wave (II), the propagation and interaction of the reflected tensile waves (III), and the nucleation, growth, and coalescence of voids (IV). The results suggest that the spall strength of the nanocrystalline Al system is attributed to a high density of Shockley partials and a slightly lower density of twinning partials (twins) in the material experiencing the peak tensile pressures.

Understanding the plasticity contributions during laser-shock loading and spall failure of Cu microstructures at the atomic scales

2021 ◽  
Vol 198 ◽  
pp. 110668
Author(s):  
Marco J. Echeverria ◽  
Sergey Galitskiy ◽  
Avanish Mishra ◽  
Remi Dingreville ◽  
Avinash M. Dongare
Keyword(s):  
Shock Loading ◽  
Laser Shock ◽  
Spall Failure

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

Ultra-Speed Plastic Deformation of TC6 Sheet Induced by Laser Shock Loading

2006 ◽  
pp. 612-616
Author(s):  
Ji Chang Yang ◽  
Jian Zhong Zhou ◽  
Yong Kang Zhang ◽  
Su Min Yin ◽  
Ai Xin Feng ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Shock Loading ◽  
Laser Shock

Characterization of Plastic Deformation Induced by Microscale Laser Shock Peening

2004 ◽  
Vol 71 (5) ◽  
pp. 713-723 ◽  
Author(s):  
Hongqiang Chen ◽  
Jeffrey W. Kysar ◽  
Y. Lawrence Yao
Keyword(s):  
Plastic Deformation ◽  
Single Crystal ◽  
Crystal Lattice ◽  
Electron Backscatter Diffraction ◽  
Fem Analysis ◽  
Copper Sample ◽  
Laser Shock Peening ◽  
Lattice Rotation ◽  
Laser Shock ◽  
Shock Peening

Electron backscatter diffraction (EBSD) is used to investigate crystal lattice rotation caused by plastic deformation during high-strain rate laser shock peening in single crystal aluminum and copper sample on 110¯ and (001) surfaces. New experimental methodologies are employed which enable measurement of the in-plane lattice rotation under approximate plane-strain conditions. Crystal lattice rotation on and below the microscale laser shock peened sample surface was measured and compared with the simulation result obtained from FEM analysis, which account for single crystal plasticity. The lattice rotation measurements directly complement measurements of residual strain/stress with X-ray micro-diffraction using synchrotron light source and it also gives an indication of the extent of the plastic deformation induced by the microscale laser shock peening.

Dynamic Spallation in Uranium under Laser Shock Loading

2019 ◽  
Vol 36 (2) ◽  
pp. 026201
Author(s):  
Da-Wu Xiao ◽  
Hua Shu ◽  
Dong-Li Zou ◽  
Chao Lu ◽  
Li-Feng He
Keyword(s):  
Shock Loading ◽  
Laser Shock

Dynamic fracture characteristics of brass foil subjected to laser shock loading

2014 ◽  
Author(s):  
Chao Zheng ◽  
Zhong Ji ◽  
Jie Fu ◽  
Yunhu Zhu ◽  
Libin Song ◽  
...  
Keyword(s):  
Dynamic Fracture ◽  
Shock Loading ◽  
Laser Shock ◽  
Fracture Characteristics
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