非比例循环加载下316不锈钢晶体塑性数值模拟

Numerical Simulation under Nonproportional Cyclic Loading Path

综合 Weng和 Bassani硬化律 ,通过对它们的改造 ,建立了一个适合于描述单晶循环硬化的单晶硬化律 ,并提出了适用于非比例循环加载条件下开动滑移系的预测方案 ,在此基础上 ,采用林同骅多晶塑性模型建立了适用于非比例循环加载条件下数值模拟迭代格式 .该模型用于预测3 1 6不锈钢材料在拉压对称循环加载路径、方型和圆型路径下的复杂循环变形行为 ,其预测结果与实验结果吻合良好 .

The theory of single crystalline constitutive model which is able to describe cyclic hardening behavior was established. Based on it, a numerically iterative plan with Lin's model was built, which is suited to the case of nonproportional cyclic loading path. The slipping system was forecasted. After that, the present model was applied to the description of complex cyclic deformation behavior of 316 stainless steel. A proportional cyclic path and two typical kinds of nonproportional cyclic paths were numerically simulated. The predictions are in good agreement with the experimental results.