Stress Field Characteristics and Finite Element Analysis of Typical Pore Structures Caused by Laser Shock Peening
LUO Maozhong1 , CAO Ziwen2 , DAI Junyi1 , ZHOU Wenlong1 , FU Xuesong1
( 1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China; 2. Science and Technology on Power Beam Processes Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China ）
Abstract：The distribution characteristics of the residual stress field caused by laser shock peening (LSP) were studied in TB6 pore structure. The finite element model of LSP was established by ABAQUS finite element software. The constant explicit damping method was used to analyze the influence of process parameters such as LSP angle, lap length and shock number on the residual stress field of the pore structure, and compared with the experimental test results. The results show that the LSP angle has an important influence on the residual stress value at the pore inner wall. The residual stress value increases with the increase of the LSP angle. The overlapping rate has no obvious effect on the stress state of the pore angle. As the number of shock increases, the residual stress also increases, but it will gradually become saturated. Finite element results including the residual stress value and evolution trend caused by LSP have a good agreement with the experimental test results.
2020, 
