The debonding mechanism of an interphase in layered and fiber-reinforced composites was investigated with an emphasis on crack deflection and penetration. A single-edged notched model consisting of three phases was analyzed by the boundary element method. The dependence of elastic fields involved in the model on elastic constant combinations was revealed. Interfacial debonding other than the competition between crack deflection and penetration may be initiated due to the high tensile and shear stress concentration before a main crack propagates to meet the next interface. The ratio of energy release rates for infinitesimal deflecting and penetrated cracks, defined as R = Gd/Gp, was computed when a main crack reached an interphase interface. The results obtained modified those for two-phase models. Discussion regarding fracture sequences observed in Ti-15-3 alloy reinforced with unidirectionally aligned SCS-6 fiber was made.
|出版ステータス||Published - 1998 9月 18|
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