Abstract
The relationship between the inelastic mechanical responses and the evolution of micro cracking and delamination in composites under combined cyclic loadings is discussed. Combined tension–compression stresses with several values of maximum stress and stress ratio were applied to Graphite/Epoxy laminate tubular specimens. The stress–strain hysteresis loops were measured at several stages of material damage. Salient increase of the plastic deformation and the energy dissipation was observed for cyclic loading of significant stress reversal (i. e., negative stress ratio). The effect of stress reversal on the enhancement of the plastic deformation is discussed based on the micrographical observations of the cross sections. It was observed that the delamination has mere crucial effects on the material damage than the matrix cracking; i. e., though the stress reversal accelerates the development of matrix cracking to delamination, the fatigue life depends largely on maximum value of stress.
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