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

The laser shocking to the Al2O3 ceramics was proceeded, and the fracture microphology that formed from the strong laser shock processing (LSP) was analyzed by the Scanning electron microscopy (SEM). It was discovered that the feature of ceramics responds differently when the laser energy was changed. The brittle fracture that consists of intergranular fracture and cleavage fracture was the main mode under high energy laser shocking (laser pulse enegry: 42J); the macroscopical fracture characteristic was the radial crack. When the laser energy reduced to a fit level (25J), the brittle fracture of ceramics appears to the characteristic of plastic deformation, its fracture microphology appears lots of slippage lines, and the macroscopical feature of radial crack under 42J become subulate crack. While the energy reduced to 15J, the Al2O3 ceramics did not fracture, its micro-hardness ascended, a feature of micro-plastic deformation was existed under the low energy. The reason of the brittle materials appears to the feature of plastic deformation was analyzed.

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Analysis the Dynamic Strain of AM60 Magnesium Alloy by Means of a Single Laser Shock Processing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.314-316.1876 ◽

2011 ◽

Vol 314-316 ◽

pp. 1876-1880

Author(s):

Ai Xin Feng ◽

Gui Feng Nie ◽

Fen Shi ◽

Chuan Chao Xu ◽

Huai Yang Sun ◽

...

Keyword(s):

Plastic Deformation ◽

Magnesium Alloy ◽

Dynamic Response ◽

Dynamic Strain ◽

Strain Gauges ◽

Laser Shock ◽

Laser Shock Processing ◽

One Dimensional ◽

Spot Center ◽

Shock Processing

In order to study the dynamic response of metal of laser shock processing, dynamic strain curves of AM60 Magnesium alloy during laser shock processing were measured by resistance strain gauges. Dynamic strain curves of three equiangular rosette near the shock spot and three strain gauges of different distances from the spot center were studied. The results indicated that the strain rate of AM60 Magnesium alloy decreased and plastic deformation increased with increasing impact times. And one dimensional strain hypothesis of laser shock processing was reasonable.

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Characterization of Plastic Deformation Induced by Microscale Laser Shock Peening

Journal of Applied Mechanics ◽

10.1115/1.1782914 ◽

2004 ◽

Vol 71 (5) ◽

pp. 713-723 ◽

Cited By ~ 52

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.

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Dynamic Spallation in Uranium under Laser Shock Loading

Chinese Physics Letters ◽

10.1088/0256-307x/36/2/026201 ◽

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

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A Study of the Microstructure and Hardness of Ti-5Al-2Sn-2Zr-4Mo-4Cr by Laser Shock Peening

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.84-85.471 ◽

2011 ◽

Vol 84-85 ◽

pp. 471-475 ◽

Cited By ~ 4

Author(s):

Wei Feng He ◽

Yu Qin Li ◽

Xiang Fan Nie ◽

Rui Jun Liu ◽

Qi Peng Li

Keyword(s):

Shock Wave ◽

Plastic Deformation ◽

Titanium Alloy ◽

High Strain ◽

The Other ◽

Laser Shock Peening ◽

Microscopic Structure ◽

Laser Shock ◽

High Strain Rate Deformation ◽

Shock Peening

In this paper, the microstructure and hardness of Ti-5Al-2Sn-2Zr-4Mo-4Cr titanium alloy with and without laser shock peening (LSP) were examined and compared. The titanium alloy samples were laser shock peened with different layers at the same power density. The microscopic structure after LSP are tested and analyzed by SEM and TEM. The results indicated that LSP changed the microstructure evidently. After 3 layers laser shock peening, there are nanocrystallization in the LSP zone. The shock wave provided high strain rate deformation and generated high-density dislocations in the material. Multiple severe plastic deformation caused by 3 to 5 LSP layers helped to rearrange the resultant dislocation, to form dislocation networks, leading to the formation of nanocrystallites. On the other hand, the microhardness across the polished surfaces of the titanium materials with and without LSP was measured. It is obvious that the laser shock peening improved the microhardness of the Ti-5Al-2Sn-2Zr-4Mo-4Cr for about 16% at the surface, and the affected depth is about 300 microns from the surface.

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