Study of anisotropic character induced by microscale laser shock peening on a single crystal aluminum

2007 ◽  
Vol 101 (2) ◽  
pp. 024904 ◽  
Author(s):  
Hongqiang Chen ◽  
Youneng Wang ◽  
Jeffrey W. Kysar ◽  
Y. Lawrence Yao
Keyword(s):  
Single Crystal ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Anisotropic Character ◽  
Shock Peening

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.

Experimental Characterization and Simulation of Three Dimensional Plastic Deformation Induced by Microscale Laser Shock Peening

2004 ◽  
Author(s):  
Hongqiang Chen ◽  
Jeffrey W. Kysar ◽  
Y. Lawrence Yao ◽  
Youneng Wang
Keyword(s):  
Plastic Deformation ◽  
Single Crystal ◽  
Three Dimensional ◽  
Finite Size ◽  
Fem Analysis ◽  
Laser Shock Peening ◽  
Lattice Rotation ◽  
Finite Size Effect ◽  
Laser Shock ◽  
Shock Peening

Different experimental techniques and 3D FEM simulations are employed to characterize and analyze the three dimensional plastic deformation and residual strain/stress distribution for single crystal Aluminum under microscale laser shock peening assuming finite geometry. Single pulse shock peening at individual locations was studied. X-ray micro-diffraction techniques based on a synchrotron light source affords micron scale spatial resolution and is used to measure the residual stress spatial distribution along different crystalline directions on the shocked surface. Crystal lattice rotation due to plastic deformation is also measured with electron backscatter diffraction (EBSD). The result is experimentally quantified and compared with the simulation result obtained from FEM analysis. The influence of the finite size effect, crystalline orientation are investigated using single crystal plasticity in FEM analysis. The result of the 3D simulations of a single shock peened indentation are compared with the FEM results for a shocked line under 2D plain strain deformation assumption. The prediction of overall character of the deformation and lattice rotation fields in three dimensions will lay the ground work for practical application of μLSP.

scholarly journals Surface Morphology and Deformation Mechanism of Single Crystal Copper Treated by Laser Shock Peening

2014 ◽  
Vol 1016 ◽  
pp. 111-114
Author(s):  
Yuan Xun Liu ◽  
Xi Wang ◽  
Xian Qian Wu ◽  
Chen Guang Huang
Keyword(s):  
Surface Morphology ◽  
Single Crystal ◽  
Deformation Mechanism ◽  
Target Material ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Single Crystal Copper ◽  
Slip Bands ◽  
Optical Profilometer ◽  
Shock Peening

To study the relation between surface morphology and deformation mechanism of the target material under the shock, a flexible boundary loading, in laser shock peening (LSP), the macroscopic and microscopic surface morphology of a single crystal copper treated by LSP was investigated. The optical profilometer shows a 200-μm-deep pit forms on the shocked surface under LSP. The optical microscopy shows a set of parallel slip bands appear at the center of the shocked region and many vertical cross slip bands appear at the edge of shocked region. This indicates a large plastic deformation occurs by means of slip for the single crystal copper under LSP and the distributing features of slip bands correspond to the spatial distribution of the shock pressure. The results confirm that the surface morphology of materials under LSP can reflect the deformation mechanism and it can be a new method of studying the deformation mechanism of materials under LSP.

scholarly journals Surface strengthening of single-crystal alumina by high-temperature laser shock peening

2020 ◽  
Vol 9 (3) ◽  
pp. 155-161
Author(s):  
Fei Wang ◽  
Xueliang Yan ◽  
Lei Liu ◽  
Michael Nastasi ◽  
Yongfeng Lu ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Surface Strengthening ◽  
Shock Peening

Response of Thin Films and Substrate to Micro-Scale Laser Shock Peening

2006 ◽  
Vol 129 (3) ◽  
pp. 485-496 ◽  
Author(s):  
Youneng Wang ◽  
Hongqiang Chen ◽  
Jeffrey W. Kysar ◽  
Y. Lawrence Yao
Keyword(s):  
Thin Films ◽  
Single Crystal ◽  
Single Crystal Silicon ◽  
Laser Shock Peening ◽  
Experimental Result ◽  
Subgrain Structure ◽  
Laser Shock ◽  
Crystal Silicon ◽  
Micro Scale ◽  
Shock Peening

Micro-scale laser shock peening (μLSP) can potentially be applied to metallic structures in microdevices to improve fatigue and reliability performance. Copper thin films on a single-crystal silicon substrate are treated by using μLSP and characterized using techniques of X-ray microdiffraction and electron backscatter diffraction (EBSD). Strain field, dislocation density, and microstructure changes including crystallographic texture, grain size and subgrain structure are determined and analyzed. Further, shock peened single crystal silicon was experimentally characterized to better understand its effects on thin films response to μLSP. The experimental result is favorably compared with finite element method simulation based on single-crystal plasticity.

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