Modelling of micromechanical fracture using a cohesive finite element method

Zhou, Min; Zhai, Jun
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p623
Academic Journal
A micromechanical model is used to characterize material failure at the meso length scale. Numerical simulations are based on a cohesive finite element model. A bilinear cohesive law is used to characterize the process of material separation. This paper discusses the solution convergence of the numerical model. Crack tip cohesive zone size and the stiffness reduction introduced by embedded cohesive surfaces are found to significantly influence the solution convergence in the numerical implementation. Upper and lower bounds for the finite element size needed for mesh independence are obtained. Numerical examples are given to illustrate the solution convergence. The effect of interphase bounding strength on damage and failure mode in a ceramic composite microstructure is analyzed.


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