Numerical simulation and experimental validation of a ductile damage model for DIN 1623 St14 steel
Numerical simulation and experimental validation of a ductile damage model for DIN 1623 St14 steel
复制标题
DOI：
10.1007/s00170-010-2831-z
复制
发表时间：
2011-03
期刊：
影响因子：
--
通讯作者：
F. Haji Aboutalebi;M. Farzin;M. Poursina
中科院分区：
文献类型：
--
作者：
F. Haji Aboutalebi;M. Farzin;M. Poursina
St14钢（DIN 1623）因其优异的可成形性和低廉的价格而广泛应用于钣金成形工业。本文研究了St14钢在复杂成形条件下的损伤行为，以减少昂贵的试验次数。采用标准拉伸试验和维氏显微硬度试验确定了St14钢的损伤参数。建立了一个完全耦合的弹塑性损伤模型，并将其实现为显式代码。利用该模型预测了钻孔和缺口试样的损伤扩展和裂纹萌生以及韧性断裂行为。由于采用了平面应力算法，该模型可以快速预测零件的变形和损伤行为，对薄板材料具有较好的预测效果。并进行了实验验证。结果表明，结合连续损伤力学（CDM）的有限元分析可以作为预测St14钢韧性损伤和断裂的可靠工具。
St14 steel (DIN 1623) is widely used in sheet metal forming industries because of its remarkable formability and also its low price. In this paper, damage behaviour of St14 steel is studied in order to be used in complex forming conditions with the goal of reducing the number of costly trials. Damage parameters of St14 steel have been determined by using standard tensile and Vickers micro-hardness tests. A fully coupled elastic-plastic-damage model has been developed and implemented into an explicit code. With this model, damage propagation and crack initiation, and ductile fracture behaviour of drilled and notched specimens are predicted. The model can quickly predict both deformation and damage behaviour of the part because of using plane stress algorithm, which is valid for thin sheet metals. Experiments are also carried out to validate the results. It is concluded that finite element analysis (FEA) in conjunction with continuum damage mechanics (CDM) can be used as a reliable tool to predict ductile damage and fracture of St14 steel.