10CrNi8MoV钢的拉伸塑性应变物理本构模型

Physical Constitutive Model of Tensile Plastic Strain for 10CrNi8MoV Steel

研究了10CrNi8MoV钢不同温度和应变速率下的拉伸应力-应变曲线。根据位错动力学将流变应力分解为热激活应力和非热激活应力,忽略粘拽阻力的影响。通过对塑性变形过程的分析,在Kocks热激活方程中引入位错间距演化函数,并用线性强化模型描述非热激活应力的变化,建立了10CrNi8MoV钢的物理本构模型。该模型对10CrNi8MoV钢在低应变速率和较宽的温度范围内的塑性变形行为有较好的描述结果。

The tensile stress-strain curves of 10 CrNi8 MoV steel are obtained by controlling the temperature and the strain rate.The flow stress is decomposed into thermal activation stress and non-thermal activation stress according to dislocation dynamics,and the influence of viscous resistance is ignored.Based on the analysis of plastic deformation process,a dislocation spacing evolution function is introduced into Kocks thermal activation equation,and the change of non-thermal activation stress is described by linear strengthening model,so the physical constitutive model of 10 CrNi8 MoV steel is established.The model can well describe the plastic deformation behavior of 10 CrNi8 MoV steel in the condition of low strain rate and wide temperature range.