摘要
文章在考虑材料内部塑性损伤的基础上,应用有限元方法对三维裂纹韧性断裂过程进行了数值模拟。通过研究多孔质材料屈服模型(G-T模型)中参数变化对初始起裂值Ji和JR阻力曲线的影响,提出了参数q2的表达式,修正了G-T模型,使其能够更好地模拟三维韧性断裂过程,与实验结果相吻合。
Aim.Existing papers in the open literature usually consider 8 parameters when applying the G-T model.We propose improving the G-T model by determining the usual q2 parameter through two extra parameters.Section 1 of the full paper briefs the G-T model.Subsection 2.2 gives eq.(7),which in full is q2=1+q2ae-rlq2b;q2a and q2b are determined through three dimensional ductile fracture numerical simulation with finite element method.The simulation results,given in Figs.7 and 8,and their analysis show preliminaril...
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2009年第6期760-764,共5页
Journal of Northwestern Polytechnical University
关键词
韧性断裂
G-T模型
有限元法
models
porous materials
G-T（Gurson-Tvergaard） model
ductile fracture
finite element method
