DP钢损伤起始与累积的差异性：数值与实验分析
The differences of damage initiation and accumulation of DP steels: a numerical and experimental analysis
摘要：
许多研究已经检查了双相钢的损伤行为。这是一个非常有趣的话题，因为了解在成形过程中的损伤机制，使生产的钢具有更好的性能和损伤容限。然而，焦点很少是在这类钢的代表之间的比较，和数值模拟的损伤状态的量化没有得到彻底的使用。因此，本研究比较了两种双相钢（DP800和DP1000），这是在汽车工业中使用的损伤的启动和积累。此外，一个耦合损伤演化的唯象损伤力学模型的参数集校准每种材料。综合分析显示，DP800的损伤开始较早，损伤累积阶段延长。对于DP 1000，损伤仅在材料失效前不久形成。材料模型能够正确地预测行为，而实验分析通过光学和SEM金相证实了预测。
英文摘要：
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.
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