CFRP[±45°]_4薄肉円管の繰返し引張-圧縮による疲労損傷過程

概要

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Relationship between inelastic mechanical response and the evolution of matrix cracking and delamination under axial cyclic loading is elucidated. Tension-compression loadings at several levels of maximum stress and stress ratio were applied to [±45°]_4 Graphite/Epoxy laminate tubular specimens. Significant inelastic deformation was observed under every cyclic loading condition, and the effect of stress reversal on the enhancement of plastic deformation was first discussed. Then, the relation between inelastic behavior and fatigue damage process was discussed by examining the internal state of damage. It was observed that delamination has more crucial effect on the material deterioration than the matrix cracking. The matrix cracking was observed to result from the development of interfacial debonding between fibers and matrix. The significant plastic deformation and salient hysteresis behavior were attributed mainly to this delamination. The changes in Young's modulus and total strain range in the process of fatigue damage were also elucidated.
社団法人日本材料学会の論文
1994-04-15