一种预测双相钢有效力学性能的方法

A method for predicting effective mechanical properties of dual phase steels

在渐近均匀化方法基础上,假设双相钢的结构为周期排列,通过ANSYS参数设计语言建立周期性边界条件,用ANSYS有限元程序对3种平面应变模型的单胞进行求解,得到双相钢的有效弹塑性性能,并与其他计算结果进行比较。研究结果表明:渐近均匀化方法能较好地模拟双相钢的力学性能;当马氏体体积分数小于13.0%时,3种平面应变模型预测的结果相差不大;当马氏体体积分数较大时,3种平面应变模型预测的结果相差较大,其中以正方形排列的单胞能较好地预测双相钢的有效力学性能。

Based on the asymptotic homogenization theory, the periodic boundary conditions for the unit cell were established by using the ANSYS parametric design language. The problem of the unit cell was solved by finite element method and the effective elasto-plastic properties of dual phase steels were obtained. The calculated results show that the effective mechanical properties of the dual phase steel can be well simulated by the asymptotic homogenization method, for the dual phase steels with martensite volume fraction less than 13%, the results predicted with the three plane strain models are quite similar. With martensite volume fraction increasing, the results for the three models are different, and the unit cell of square array can well predict the effective pro-perties of dual phase steels with higher martensite volume fraction.