摘要
研究利用虚拟裂纹闭合法(VCCT)和通用有限元程序计算裂纹扩展能量释放率(G).利用开发的接口单元,将VCCT集成于有限元软件中.基于这一原理,通过ABAQUS用户单元子程序UEL编写9,16,20节点接口单元,将VCCT法集成于8节点和20节点6面体网格中,直接通过有限元计算输出能量释放率,无需进行复杂的后处理.最后,通过2个算例对该接口单元进行了验证.结果表明,利用所编写的界面单元能够得到准确的计算结果,同时提高了计算效率.
Computation of the energy release rate （G） based on the virtual crack closure technique （VCCT） and finite element method is presented. The process is really redundancy when calculating the G value by processing the results of finite element method. However, the VCCT method can be implemented into finite element software by developing the interface element. Based on the principle, 9,16,20 node interface element were compiled via the ABAOUS userdefined element （UEL） procedure. Then they can be integrated into the 8 node and 20 node finite element and output the G value by the finite element analysis. At last, two examples are presented to validate these interface elements. The results show that the proposed interface elements can be used to compute the precise G, and the computational efficiency is improved.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2010年第1期37-41,共5页
Transactions of Beijing Institute of Technology
基金
国家部委预研项目(40402010105)
关键词
能量释放率
虚拟裂纹闭合法
接口单元
有限元法
energy release rate
virtual crack closure technique
interfacial element
FEM
