Practical microstructure-informed dual-scale simulation for predicting hole expansion failure of hyper-burring steel
Practical microstructure-informed dual-scale simulation for predicting hole expansion failure of hyper-burring steel
复制标题
用于预测超毛刺钢扩孔失效的实用微观结构双尺度模拟
DOI：
10.1016/j.ijmecsci.2019.04.010
复制
发表时间：
2019
影响因子：
7.3
通讯作者：
H. Han
中科院分区：
文献类型：
--
作者：
S. Park;Jinwook Jung;K. I. Kim;H. Kim;Sungil Kim;K. Oh;Myoung;H. Han
建立了一个实用的双尺度有限元模型，用于预测超翻边钢板的扩孔成形性。这种数值方法诉诸各向同性的宏观尺度孔扩张模拟计算孔边缘附近的变形历史，因为它们是已知的潜在的裂缝萌生部位。在低微尺度模型中，变形历史被用作边界条件，用于计算钢板的局部断裂。微观模拟利用位错密度为基础的本构模型和微观结构为基础的代表性体积元（RVE），与现实的晶粒形态取自实验显微镜。在孔边缘区域的断裂起始进行评估，从微观尺度模拟使用四个经常采用的非耦合韧性断裂模型，使临界断裂应变的定义。所提出的双尺度模型可以更好地预测孔边附近的故障启动和位置时，模型参数进行校准，不仅考虑到孔边的变形历史，但也局部应力三轴性。此外，建议的双尺度模型被应用于分析微观结构对扩孔率的影响，通过提供洞察晶粒尺寸和晶界特性的影响。
A practical dual-scale finite element model is developed to enable the formability prediction in the hole expansion of a hyper-burring steel sheet. This numerical approach resorts to the isotropic macroscale hole expansion simulation for calculating the deformation histories near the hole edge, since they are known to be the potential fracture initiation site. The deformation histories are used as boundary conditions in the lower microscale model for calculating the local fracture of the steel sheet. The microscale simulation utilizes the dislocation density based constitutive model and a microstructure-based representative volume element (RVE), with realistic grain morphology taken from experimental microscopy. The fracture initiation at the hole edge region is evaluated from the microscale simulation using four frequently employed uncoupled ductile fracture models, which enable the definition of the critical fracture strain. The proposed dual-scale model can better predict the failure initiation and location near the hole edge when the modeling parameters are calibrated taking into account not only the deformation histories of the hole edge, but also the local stress triaxiality. Moreover, the proposed dual-scale model is applied to analyze the microstructure effect on the hole expansion ratio by providing the insights into the effect of grain size and grain boundary characteristics.
DOI：
10.1016/j.jmatprotec.2009.11.014
发表时间：
2010-03-01
影响因子：
6.3
作者：
Mori, Ken-ichiro;Abe, Yohei;Suzui, Yoshio
通讯作者：
Suzui, Yoshio