Influence of laser shock wave propagation characteristics on dynamic plastic deformation of micro-dimple on E690 steel surface

doi:10.13251/j.issn.0254-6051.2022.06.045

Abstract

Abstract: Influence of laser shock times and shock wave propagation characteristics on dynamic plastic deformation of micro-dimple during multiple shocks was studied by using the software ABAQUS to analyze the propagation law of stress waves in E690 high-strength steel and the dynamic plastic strain of the micro-dimple on the steel surface. Then the accuracy of the simulation was verified by designed experiments. The results show that the attenuation of the stress wave caused by the shock pressure in the depth direction of the material shows the characteristics of first fast and then slow. The attenuation speed of the stress wave during the third shock and fourth shock is basically close. Affected by the synergistic effect of surface waves and longitudinal waves during the dynamic propagation of shock waves, the overall plastic deformation depth of the micro-dimple surface decreases along the center of the spot radially to the surroundings. Comparing the test results and simulation results of plastic deformation in the depth direction of micro-dimple after shocking for 1-4 times, the maximum error is 4.80%, indicating that the simulation model is accurate and reliable. Simultaneously, as the times of shock increase, the increasing trend of hardness slows down, and the micro-dimple surface appears hardening saturation after four shocks.

Key words: E690 high-strength steel, laser shock micro-dimple, shock wave propagation, dynamic plastic strain, numerical simulation

CLC Number:

Wang Zhimin, Huang Chunling, Cao Yupeng. Influence of laser shock wave propagation characteristics on dynamic plastic deformation of micro-dimple on E690 steel surface[J]. Heat Treatment of Metals, 2022, 47(6): 253-258.

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