基于幂指数硬化模型的细观损伤参数标定方法

Calibration Method of Microscopic Damage Parameter Based on Power Exponential Hardening Model

损伤参数的标定一直是GTN细观损伤模型在工程应用中的瓶颈,参数选取的合理与否直接影响模拟结果的准确程度。本文提出了一种基于幂指数硬化模型的细观损伤参数的标定方法,利用响应面法建立了硬化参数与损伤参数的函数关系;再利用硬化参数建立了误差评价函数来确定损伤参数。以双相钢DP780为例,进行单向拉伸及槽型件成形数值仿真,并与试验结果进行了对比,验证了本文方法的准确性和有效性。

The calibration of damage parameters were always the bottleneck of GTN microscopic damage model in engineering application. Whether parameter selection was reasonable or not directly affected the accuracy of the simulation results. This paper proposed a calibration method of microscopic damage parameter based on the power exponential hardening model. The method not only designed a test which used the response surface method to establish function relation between hardening parameter and damage parameter,but also established the error evaluation function based on hardening parameter to determine the damage parameter. Taking DP780 as example,the uniaxial tensile and slot part forming numerical simulation were conducted. Compared with experimental results,this method was proved to be accurate and effective.