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Journal of Composite Materials
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Long-term Fatigue Strength Prediction of CFRP Structure Based on Micromechanics of Failure

Hongneng Cai

Materials System Research Laboratory, Kanazawa Institute of Technology 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan, hongneng{at}neptune.kanazawa-it.ac.jp

Yasushi Miyano

Materials System Research Laboratory, Kanazawa Institute of Technology 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan

Masayuki Nakada

Materials System Research Laboratory, Kanazawa Institute of Technology 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan

Sung Kyu Ha

Department of Mechanical Engineering, Hanyang University, 1271 Sa1-dong Ansan-si, Gyunggi-do 426-791, Korea

A prediction method for the fatigue strength of polymer composites under arbitrary frequency, load ratio and temperature was developed with the combined method of the micromechanics of failure (MMF) developed by Ha and the accelerated testing methodology (ATM) developed by Miyano and Nakada. The time— temperature dependent master curves of MMF/ATM critical parameters were constructed by tensile and compressive static and fatigue tests for the longitudinal and transverse directions of unidirectional CFRP under various temperatures based on the three-dimensional micromechanics of fibers and matrix resin and the time— temperature superposition principle which holds for the viscoelastic behavior of matrix resin. These master curves can be used to predict the fatigue strength of composite structures with multi-directional laminations at any time, temperature, and number of cycles to failure. The applicability of MMF/ATM combined method to predict the long term strength of CFRP structures was experimentally confirmed by prediction of the open hole compression fatigue strength of the quasi-isotropic CFRP laminates.

Key Words: accelerated testing methodology • fatigue strength • failure prediction • micromechanics of failure • constituent-based strength analysis.

Journal of Composite Materials, Vol. 42, No. 8, 825-844 (2008)
DOI: 10.1177/0021998307088611
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Yuanchen Huang, Kyo Kook Jin, and Sung Kyu Ha
Effects of Fiber Arrangement on Mechanical Behavior of Unidirectional Composites
Journal of Composite Materials, September 1, 2008; 42(18): 1851 - 1871.
[Abstract] [PDF]