ABSTRACT DAVE, GAURAV. Progressive Damage Analysis of Composite laminates under Fatigue: A Step-Based Method. (Under the direction of Dr. Mark Pankow). The performance of a step-based method as a progressive damage analysis (PDA) for modeling fatigue in fiber reinforced composites is investigated. This approach involves using the built-in continuum damage model in the commercial finite element software Abaqus TM which is based on a cohesive traction-separation law. A step-based degradation of in-plane and out-of-plane properties is added to simulate fatigue loading. The fidelity of the model rests on the number of steps used to degrade properties, and two such binning strategies are demonstrated to highlight the difference. Single element studies are followed by performing simulations on open-hole configurations with two shell element formulations. The difference in the formulations is in their ability to model delamination failure in composites, which consequently changes the computational cost involved. The results of the open-hole configurations are compared to the experimental data published by the Air Force Research Laboratory (AFRL) and other state of the art PDA methods. The aforementioned results were all a part of an exercise to evaluate how fatigue is modeled by the available methods. In this work, tension-tension fatigue simulations followed by residual tension simulations are performed for one laminate sequence, and the same is repeated as a blind prediction for another complicated laminate sequence. The model is evaluated based on the damage in the specimen after 300K/200K cycles, as well as the residual strength and stiffness of the specimen. The effect of degrading out-of-plane properties under fatigue on the overall performance is also investigated. The model is found to perform fairly well for the first laminate sequence, with
Progressive Damage Analysis of Composite laminates under Fatigue: A Step-Based Method
Jun 16, 2023
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