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基于率相关的晶体塑性滑移理论,论文考虑晶体内部塑性变形产生的热以及快速热冲击作用下温度急剧变化产生热应力的热-力双向耦合效应,建立起微观单晶的瞬态热-弹-塑性耦合模型,推导出与温度有关的剪应变率和弹塑性切模量公式.根据论文建立的模型,对ABAQUS软件进行二次开发[1],数值模拟出<001>/{100}单晶Cu在单轴拉伸状态下的应力、应变与温度的关系和弹性模量的变化,结果如下:轴向应力随温度升高先呈线性增加再呈非线性减小,轴向应变随温度增加而增加;弹性模量随塑性变形的增加而降低,与分子动力学模拟的趋势[2]是一致的.数值实验表明,论文建立的模型和算法是正确合理的,且计算量远远小于分子动力学模拟.
Based on the rate-dependent crystal plastic sliding theory, the paper considers the heat generated by the plastic deformation in the crystal and the thermo-bi-directional coupling effect of the thermal stress caused by rapid thermal shock under the rapid thermal shock, and establishes the transient thermo-elastic - plastic coupling model and derive temperature-dependent shear strain rate and elasto-plastic moduli formula.According to the model established in this thesis, the secondary development of ABAQUS software [1] is carried out, and the numerical simulation of <001> / {100} The relationship between stress and strain and temperature and elastic modulus of Cu under uniaxial tension are as follows: The axial stress increases linearly with the increase of temperature and then decreases non-linearly. The axial strain changes with temperature Increases with the increase of plastic deformation.The elastic modulus decreases with the increase of plastic deformation and is consistent with the trend of molecular dynamics simulation.2 Numerical experiments show that the models and algorithms established in this paper are correct and reasonable, Molecular dynamics simulation.