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Materials 2018, 11(7), 1182; https://doi.org/10.3390/ma11071182

Fatigue Life Prediction for Transverse Crack Initiation of CFRP Cross-Ply and Quasi-Isotropic Laminates

1
Department of Applied Mechanics and Aerospace Engineering, Waseda University, Tokyo 169-8555, Japan
2
Kagami Memorial Research Institute for Material Science and Technology, Waseda University, Tokyo 169-0051, Japan
*
Author to whom correspondence should be addressed.
Received: 4 June 2018 / Revised: 2 July 2018 / Accepted: 5 July 2018 / Published: 10 July 2018
(This article belongs to the Special Issue Carbon Fiber Reinforced Polymers)
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Abstract

Carbon fiber reinforced plastic (CFRP) laminates are used as main structural members in many applications. Transverse cracks that form in 90° layers of CFRP laminates are mostly initial damage in the case where tensile loading is vertically applied to the 90° layers of CFRP laminates, and they are the origin of more serious damage of delamination and fiber breakage. It is thus important to predict quantitatively the transverse crack initiation of CFRP laminates subjected to cyclic loading to ensure the long-term reliability of the laminates. The initiation and multiplication behaviors of transverse cracks strongly depend on the laminate configuration, thickness, and thermal residual stress. Therefore, a model based on the Walker model was proposed to predict transverse crack initiation in CFRP cross-ply and quasi-isotropic laminates under cyclic loading in the present study. The usefulness of the proposed model was verified with 10 different CFRP laminates formed from four different prepregs with epoxy resin matrices. The analysis results were in good agreement with experimental results. The fatigue life was expressed with three constants, which related to the fatigue strength reduction, the normalized fatigue strength at N = 1 cycle, and the contribution of stress amplitude to the fatigue life, and they are independent of the laminate configuration. View Full-Text
Keywords: carbon fiber reinforced plastic laminates; transverse crack; fatigue; initiation; prediction carbon fiber reinforced plastic laminates; transverse crack; fatigue; initiation; prediction
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Hosoi, A.; Kawada, H. Fatigue Life Prediction for Transverse Crack Initiation of CFRP Cross-Ply and Quasi-Isotropic Laminates. Materials 2018, 11, 1182.

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