基于APDL语言的本征应变法重构激光冲击强化后的残余应力场  

Reconstruction of Residual Stress Field after Laser Shock Peening by Eigenstrain Method Based on APDL Language

作　　者：蔡舒鹏 张永康 CAI Shupeng;ZHANG Yongkang(School of Mechanical and Electrical Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学机电工程学院,广东广州510006

出　　处：《电加工与模具》2021年第5期52-57,共6页Electromachining & Mould

基　　金：国家自然科学基金资助项目(51775117);江苏省科技计划项目(BA2018070)。

摘　　要：激光冲击强化作为一种表面强化处理方式得到了广泛应用,此过程会在金属表层下方植入残余压应力,从而使金属的抗疲劳损伤能力和失效寿命大大提升,通过施加本征应变重构研究了激光冲击强化后金属内部的残余应力场。利用有限元软件ANSYS/LS-DYNA对单次激光冲击强化过程进行非线性显式动力学分析,将分析结果导入ANSYS/Mechanical模块进行静力分析,从而得到金属内部的残余应力分布。使用本征应变方法重构残余应力场时,首先将从后处理结果进行计算得到材料的本征应变分布,然后基于APDL语言对ANSYS进行二次开发,将得到的本征应变分布施加到相应节点上进行静力分析,应力平衡后得到的应力分布即为残余应力场。通过比较发现,该方法在测量点较少的情况下也能很好地重构残余应力场。Laser shock peening has been widely used as a surface strengthening treatment,and this process will implant residual compressive stress under the metal surface,which greatly improves its resistance to fatigue damage and failure life of the metal.The residual stress field in the metal after laser shock peening can be reconstructed by applying eigenstrain.The nonlinear explicit dynamic analysis of single laser shock peening process was carried out by using the finite element software ANSYS/LS-DYNA,and the analysis results were imported into the ANSYS/Mechanical module for static analysis,so as to obtain the residual stress distribution in the metal.When reconstructing the residual stress field by eigenstrain method,the eigenstrain distribution of the material was calculated from the post-processing results firstly,and then the obtained eigenstrain distribution was introduced into the corresponding nodes for static analysis based on the secondary development of ANSYS using APDL language.Residual stress distribution will be obtained after stress equilibrium attains.Through comparison,it was found that this method can reconstruct the residual stress field well in the case of fewer measuring points.

关 键 词：激光冲击强化 残余压应力 本征应变 APDL语言 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]