JSME International Journal Series A Solid Mechanics and Material Engineering
Online ISSN : 1347-5363
Print ISSN : 1344-7912
ISSN-L : 1344-7912
Mesoscopic Fracture Mechanism of Mode II Delamination Fatigue Crack Propagation in Interlayer-Toughened CFRP
Satoshi MATSUDAMasaki HOJOShojiro OCHIAI
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1997 Volume 40 Issue 4 Pages 423-429

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Abstract

Delamination crack growth behavior under mode II cyclic loading was investigated with interlayer-toughened CFRP laminate, T800H/3900-2. Fatigue tests under a constant maximum energy release rate showed that the growth rate was independent of the crack length. Then, load-shedding tests were carried out under various stress ratios. The fatigue crack growth resistance of the interlayer-toughened CFRP was higher than that of conventional CF/epoxy. The crack growth rate under various stress ratios was well correlated to the stress intensity range near the threshold region. Thus, the mechanism of fatigue fracture under mode II loading is completely different from that under mode I loading. Fractographic observation showed that the fatigue fracture occurred on the principal shear stress plane. Large hackle patterns which are typical for static mode II tests were not observed under fatigue loading. A mesoscopic fracture model was proposed to explain the microscopic observation and the stress ratio dependence.

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