【摘要】 基于一种位错动力学模型建立了非弹性应变率偏张量第二不变量与应力偏张量第二不变量之间的函数关系,由此给出一种粘塑性本构方程。确定了方程中的参数。计算了材料Ti—50A在准静态及中等应变率时的几种应力应变曲线。与已有的实验资料相比,初步计算给出令人满意的结果。更多还原

【Abstract】 Based on a dislocation dynamic model, a dependence between the second invariants of the inelastic deformation rate and those of stress deviator is proposed and thus a rate-dependent visco/plastic constitutive equation is built. The parameters in the equation are determined. The several stress-strain curves of material Ti-50A under quasi-static and mid strain rate are calculated. In comparison with the experiment data available the primary calculations have yielded fair results.更多还原