晶体塑性有限元方法研究辐照对多晶铜力学性能的影响  

Effect of Irradiation on Mechanical Properties of Polycrystalline Copper:Crystal Plasticity Finite Element Method

作　　者：李宏明 李茂生[2] LI Hongming;LI Maosheng(Graduate School,China Academy of Engineering Physics,Beijing 100088,China;Institute of Applied Physics and Computational Mathematics,Beijing 100088,China)

机构地区：[1]中国工程物理研究院研究生院,北京100088 [2]北京应用物理与计算数学研究所,北京100088

出　　处：《计算物理》2022年第1期6-16,共11页Chinese Journal of Computational Physics

基　　金：国家磁约束核聚变能研究专项(2015GB108002)资助。

摘　　要：将辐照硬化理论与晶体塑性理论结合,运用ABAQUS有限元分析软件模拟辐照后多晶铜的拉伸过程。分析辐照效应对材料屈服强度、硬化过程、晶体变形等力学性能的影响,研究位错密度的演化及空间分布规律。数值模拟表明:辐照效应提高多晶铜的屈服应力,影响不同阶段的硬化和软化现象;辐照剂量增大导致位错密度增殖总体变缓,空间不均匀度增大;晶体的塑性变形及晶体转动也受到辐照的影响,在相同的应变条件下,辐照剂量越大,晶体塑性变形程度越小,塑性变形分布不均匀度变大,同时晶体转动程度及转动角离散度增大。Based on irradiation hardening theory and crystal plasticity theory, tensile process of irradiated polycrystalline copper was simulated with ABAQUS finite element analysis software. Effects of irradiation on mechanical properties of materials such as yield strength, hardening process, crystal deformation are analyzed. Temporal evolution and spatial distribution of dislocation density are studied. It shows that: The yield stress of polycrystalline copper is increased with irradiation and hardening and softening phenomena in different stages are affected. The increase of irradiation dose slows the proliferation of dislocation density, and increases its spatial inhomogeneity. Plastic deformation and crystal rotation are also affected by irradiation. Under same strain condition, the greater the irradiation dose is, the greater the deformation degree is and the greater the inhomogeneity of plastic deformation distribution is. Meanwhile, with the increase of irradiation dose, the degree of crystal rotation and angular dispersion increases.

关 键 词：晶体塑性有限元 辐照效应 位错 变形 

分 类 号：O733[理学—晶体学]