C/Aハイブリッド一方向FRP積層板の疲労挙動の時間および温度依存性

概要

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To investigate the time and temperature dependences of the fatigue behavior of carbon/aramid hybrid unidirectional FRP laminates (C/A hybrid FRP) in which CFRP layer was sandwiched between two AFRP layers, three point bending fatigue tests for CFRP, AFRP and C/A hybrid FRP were conducted at several levels of temperature and frequency. The flexural fatigue strengths of CFRP, AFRP and C/A hybrid FRP depended on temperature and frequency, and the reciprocation law between time and temperature held for these strengths. The flexural fatigue fracture of C/A hybrid FRP was classified into two modes by temperature, frequency and number of cycles to failure N_f. One is triggered by the tensile fracture of AFRP layer in the range of low temperature, high frequency and low N_f. where the fatigue strength changes scarcely with temperature, frequency and N_f. The other is triggered by the compressive fracture of CFRP layer in the range of high temperature, low frequency and high N_f Where the fatigue strength decreases remarkably with temperature, frequency and N_f.
社団法人日本材料学会の論文
1991-02-15