论文标题
DP钢的损伤引发和积累的差异：数值和实验分析
The differences of damage initiation and accumulation of DP steels: a numerical and experimental analysis
论文作者
论文摘要
许多研究已经检查了双相钢的损伤行为。这是一个引起人们兴趣的话题，因为理解成型过程中损害的机制可以使钢的生产具有提高的性质和损害耐受性。但是，重点很少在该钢类类别的代表之间的比较上，而量化损伤状态的数值模拟未被充分使用。因此，这项研究比较了在汽车行业中使用的两个双相钢（DP800和DP1000）的损坏开始和积累。另外，为每种材料校准具有耦合损伤演化的现象学损伤力学模型的参数集。组合分析表明，DP800的损害较早开始，其中损坏积累阶段延长。对于DP1000，损害仅在物质故障之前不久才成核。材料模型能够正确预测行为，而实验分析证实了光学和SEM术的预测。
Many studies have examined the damage behaviour of dual-phase steels already. It is a topic of high interest, since understanding the mechanisms of damage during forming processes enables the production of steels with improved properties and damage tolerance. However, the focus was rarely on the comparison between representatives of this steel class, and the numerical simulation for the quantification of damage states was not thoroughly used. Therefore, this study compares the damage initiation and accumulation of two dual-phase steels (DP800 and DP1000), which are used in the automotive industry. Additionally, parameter sets of a phenomenological damage mechanics model with coupled damage evolution are calibrated for each material. The combined analysis reveals an earlier initiation of damage for the DP800, where the damage accumulation phase is prolonged. For DP1000 the damage nucleates only shortly before material failure. The material model is able to correctly predict the behaviour, while experimental analysis confirms the prediction via light optical and SEM metallography.
