关键词: 激光喷丸, 应力波, 有限元分析, 显式算法, 隐式算法, 变形量, 残余应力

Abstract: Laser peening forming is a novel technology which employs stress waves induced by laser to form a plate. This technology is characterized by high speed, short duration, high strain rate, and non-linearity ofdeformationof materials. This article explicit dynamic analysis is implemented for shock wavesolid interaction, and implicit analysis for relaxation of pressured materials. A model is developed for numerical solution, and some key issues in finite element simulation, such as material model, pressure loading profile, and grid map, are discussed in detail. The stress and deformation field after laser peening are predicted. A series of experimentsof strip laser peening are conducted to validate the model, and the residual stresses are measured by X-ray diffraction (XRD) while deformation is measured by an arc height tester. Experimental data and numerical values are in good agreement.

Key words: laser peening, stress wave, finite element analysis, explicit algorithm, implicit algorithm, deformation magnitude, residual stresses