Thermomechanically coupled damage model for operating loads – predicting service life of formed parts (C01)

发展的各向异性和梯度增强的延性损伤(与塑性耦合)模型被扩展为准脆性损伤(与能量释放率耦合)，以适用于更高循环的操作。数值实现是在变分的、热力学耦合的环境中通过有效的时间均匀化进行的。除了标定和验证外，实验分析还表征了成形引起的初始损伤对循环性能的影响。运行条件的影响是根据相关的加载路径、几何形状、热处理和试验温度来量化的，并通过相关的机制来表征。

The developed anisotropic and gradient-enhanced model for ductile damage (coupled to plasticity) is extended by quasi-brittle damage (coupled to the energy release rate) for operations at higher cycles. The numerical implementation takes place by an efficient time homogenization in a variational, thermodynamically coupled setting. In addition to calibration and validation, the experimental analysis characterizes the influence of forming-induced initial damage on the cyclic performance. The effect of operation conditions is quantified with respect to relevant load paths, geometries, heat treatments, and test temperatures and is characterized by the associated mechanisms.