Predicting Fatigue Damage of Composites Using Strength Degradation and Cumulative Damage Model (Postprint)
Journal Article - Open Access
San Diego State University San Diego United States
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This paper discusses implementation of an empirical strength and stiffness degradation scheme to predict fatigue failure and residual stiffness and strength of laminated composites. A cumulative damage accumulation approach was implemented to account for the non-constant stress levels that occur due to stress distributions arising from stiffness degradation and local failures during fatigue loading. Degradation of strength and stiffness during fatigue loading of the composite was implemented following the empirical model presented by Shokrieh and Lessard. The fatigue analysis was performed with ABAQUS finite element software employing a user-defined material subroutine UMAT developed for the material response. Implementation results were first verified for unidirectional laminate test cases, validated by predicting stress versus life S-N curves for several laminate coupons test simulations and residual strengths of Open Hole Tension OHT specimens subjected to constant amplitude fatigue loading.
- Laminates and Composite Materials