淬火工艺有限元模拟中弹塑性比例系数的计算方法

淬火过程是一个温度、相变、应力应变相互影响的材料非线性过程。根据淬火过程的特点,提出了一种新的计算弹塑性比例系数的方法,使用该方法可以求解过渡单元的弹塑性比。在模拟过程中,为了提高计算精度、减少计算时间,提出了两种加速弹塑性比例系数收敛的方法:弹性逼近法和插值方法。应用弹性逼近法和插值方法对无相变冷却过程和有相变冷却过程进行有限元模拟,将模拟所得应力变化曲线与实验结果相比较。结果表明,弹性逼近法和插值方法可以显著减少弹塑性比例系数的迭代次数,计算得到的应力值与实验结果吻合较好。

The calculating method of elastic-plastic ratio in the FEMsimulation process of quenching

Quenching technology is a complex process of non-linear material with the effect of temperature, phase-transformation and stress/strain each other. According to the characters of quenching, a new method of calculating the elastic-plastic ratio is presented in the paper, this method can be applied to calculate the elastic-plastic ratio of the transition elements in the quenching process effectively. In order to improve the calculation accuracy and save the calculation time, the elasticity approximation method and the power interpolation method that can accelerate the convergence of elastic-plastic ratio are presented in the paper. The two methods are used to simulate the cooling process without phase transformation and the cooling process with phase transformation, the simulation results of stresses are contrasted with the corresponding experiment results. The comparison shows that, the simulation results are consistent with the experiment results, the two methods can reduce the iteration number of elastic-plastic ratio remarkably.