基于微观损伤机理的延性裂纹扩展行为分析  

Extension of ductile fracture based on micro-plastic damage

作　　者：朱智军[1] 荆洪阳[1] 徐连勇[1] 霍立兴[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《焊接学报》2006年第8期67-70,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50275107)

摘　　要：在考虑材料内部塑性损伤的基础上,通过有限元数值方法(特殊单元模型法),编制了求解韧性断裂特征参量的程序,模拟材料的韧性断裂过程。通过单轴拉伸试验的模拟结果,得出反映材料微观损伤的控制参量,再根据该参量对同种材料的标准三点弯曲试验进行定量预测,即实现从一种试验结果预测同种材料的其它试验结果。结果表明,在韧性裂纹扩展时,考虑塑性损伤的特殊单元模型能够很好地描述材料的韧性断裂过程,可以实现同种材料不同试验间相互预测的目的。Considering the inner micro plastic damage ,using the finite element method (the computational cell model) and compiling the program to get parameters controlled ductile crack growth, the process of ductile fracture was simulated. The parameters to controll ductile crack growth were gotten from the simulating uniaxial tension test, which means that tests of the same material can be forecasted each other based the cell model. The results indicate that the prediction is in a good agreement with the experiment, and the cell model gives a good description of ductile crack growth.The prediction between different tests of the same material is reasonable.

关 键 词：塑性损伤 有限元数值方法 试验 韧性断裂 

分 类 号：TH404[机械工程—机械制造及自动化]