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Abstract

In this work, a finite element model is developed to predict the progressive fatigue damage and the life of the composite laminate with different layup sequences based on the longitudinal, transverse, and in-plane shear fatigue characteristic of a carbon/epoxy laminate. In order to consider the stochastic laminate’s properties from element-to-element in the model and due to probable initial flaws and impurities, the laminate’s stiffness and strength are randomly generated using a Gaussian distribution function. Sudden and gradual material properties degradation are applied during fatigue. The procedure of stress analysis, failure analysis, and material property degradation are programmed using UMAT (user-defined material) and USDFLD (user-defined field variables) subroutines in ABAQUS. The predicted fatigue life of the finite element analysis for different layups is in good agreement with the experimental results.

Keywords

Laminates fatigue damage mechanics finite element analysis stochastic material properties

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Finite element simulation of fatigue life prediction in carbon/epoxy laminates

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