Rate-Dependent Cohesive Zone Modeling of Unstable Crack Growth in an Epoxy Adhesive
Rate-Dependent Cohesive Zone Modeling of Unstable Crack Growth in an Epoxy Adhesive
复制标题
DOI：
10.1080/15376490802540556
复制
发表时间：
2005-01
影响因子：
2.8
通讯作者：
Dhaval P. Makhecha;R. Kapania;E. Johnson;D. Dillard;G. Jacob;J. M. Starbuck
中科院分区：
文献类型：
--
作者：
Dhaval P. Makhecha;R. Kapania;E. Johnson;D. Dillard;G. Jacob;J. M. Starbuck
本文提出了一个率相关的环氧树脂胶粘剂的断裂模型的发展和数值实现。先前的模式I断裂试验下进行的准静态，位移控制加载的铝双悬臂梁（DCB）与环氧树脂粘接表现出不稳定的裂纹扩展的粘合剂。本文报道了由散装胶粘剂制成的紧凑拉伸试样在十字头打开速度增加时的I型断裂试验结果。紧凑拉伸试验结果表明，临界应变能释放率随十字头速度的增加而减小，在十字头速度为1 m/s时，临界应变能释放率约为其准静态值的20%。基于压实拉伸试验数据，建立了两种速率相关的粘结区模型。假设了裂纹面上的力与张开位移和张开速度之间存在内聚-内聚关系。这些速率相关的凝聚区模型在界面有限元中实现，以模拟粘合剂中的离散裂纹扩展。从模拟的DCB测试的反作用力的历史是在良好的协议与测试数据仅使用率相关的界面元素来模拟的粘合剂。
This paper presents the development and numerical implementation of a rate-dependent fracture model of an epoxy adhesive. Previous mode I fracture tests conducted under quasi-static, displacement controlled loading of an aluminum double cantilever beam (DCB) bonded with the epoxy exhibited unstable crack growth in the adhesive. Results from mode I fracture tests of compact tension specimens made from bulk adhesive at increasing cross head opening speeds are reported in this paper. The compact tension tests results showed a decreasing critical strain energy release rate with increasing cross head speed, with the critical energy release rate at 1 m/s cross head speed equal to about 20% of its quasi-static value. Two rate-dependent cohesive zone models are formulated based on the compact tension test data. A cohesive de-cohesive relationship was postulated between the tractions acting across the crack faces and the opening displacement and opening velocity. These rate-dependent cohesive zone models are implemented in an interface finite element to model discrete crack growth in the adhesive. The reaction force history from simulation of the DCB test is in good agreement with the test data using only the rate-dependent interface element to model the adhesive.