FAILURE PREDICTION AND CRACK PROPAGATION WITH STRESS CONCENTRATION USING COHESIVE ZONE FINITE ELEMENT ANALYSIS

Arshad Ali, Ehsanullah Kakar

Abstract


In most of the structures, failure occurs due to stress concentrations having notches, sharp corners with different radii’s due to the built in geometry of the structure, thereby tend to weaken the structure and the crack may likely to initiate, followed by crack propagation toward the weakest zone within the material. The aim of this research work is to investigate and predict the structural failure with stress concentration having sharp corners with different corner radii’s, using the finite element modelling. Stress concentration and crack propagation has been considered in detail.
In this study, cohesive zone model has been considered in greater details to investigate the stress concentration phenomenon using the finite element modelling approach based on exponential load displacement model for interfacial separation of cohesive surfaces produced by the nodal release approach after node merging mechanism.
For each model presented in this research work, a separate user input file has been developed using ANSYS APDL script language, which can later be used for specific change of various variables like crack path, corner radius, meshing, refined meshing, areas and boundary conditions along the specific regions to determine and compare results.

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