Paper number 257
|TIME AND TEMPERATURE DEPENDENCE OF FLEXURAL FATIGUE STRENGTH FOR PITCH-BASED CFRP|
Masayuki Nakada1, Yasushi Miyano1, Masayuki Ikeda1, and Shinichi Takemura2
1Materials System Research Laboratory, Kanazawa Institute of Technology,
Yatsukaho, Matto, Ishikawa 924-0838, Japan
2Central Technical Research Laboratory, Nippon Oil Company, Ltd.
Chidori-Cho Nakaku, Yokohama 231-0815, Japan
|Summary||The flexural fatigue behavior of three types of unidirectional CFRP laminates, combined with three types of pitch-based carbon fibers and single type of matrix epoxy resin, were evaluated at several levels of loading rate and temperature. The CSR (constant strain-rate) and the fatigue behavior of these CFRPs were found to be remarkably dependent on time and temperature. The time-temperature superposition principle for the CSR strength of the CFRPs holds also for these fatigue strengths, although these time-temperature shift factors do not always agree with that of the viscoelastic behavior of the matrix resin. The master curves of flexural fatigue strength for three types of CFRP were obtained, and the characteristics of these fatigue strengths were clarified from these master curves.
||Keywords|| pitch-based carbon fiber, CFRP, flexural behavior, fatigue, time and temperature dependent properties.
Theme : Mechanical and Physical Properties
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