Journal
COMPOSITE STRUCTURES
Volume 215, Issue -, Pages 85-97Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2019.02.041
Keywords
Chopped carbon fiber chip-reinforced composite; Tension-tension fatigue behavior; Crack initiation and propagation; Multi-scale fatigue model
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Funding
- Ford Motor Company
- U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) [DE-EE0006867]
- HPC System at Ford Motor Company
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In present study, the fatigue damage behavior of chopped carbon fiber chip-reinforced composite has been experimentally and numerically investigated. A large scatter is exhibited in the S-N diagram due to the random distribution of carbon fiber chips, and therefore a new analysis procedure is proposed to link the local microstructure to the fatigue behavior of the bulk material. Interrupted fatigue tests are also performed so that microstructure characterization can be conducted on the tested samples to analyze the crack initiation and propagation. Inspired from the experimental findings, a multi-scale progressive damage fatigue model is proposed to predict the fatigue behavior. The model incorporates a new stochastic chip-packing algorithm for microstructure reconstruction along with continuum damage models into the representative volume element (RVE) model in ABAQUS/Explicit. The simulation results based on the proposed model are in good agreement with the experimental data in terms of cracking modes and predicted life.
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