Debonding mechanisms in the presence of an interphase in composites

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...

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Bibliographic Details
Published in:Acta materialia 1998-09, Vol.46 (15), p.5237-5247
Main Authors: Liu, Y.-F., Tanaka, Y., Masuda, C.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Dispersion-, fiber-, and platelet-reinforced metal-based composites
Exact sciences and technology
Materials science
Other materials
Physics
Specific materials
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Summary: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= G d/ G p, 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.
ISSN:1359-6454
1873-2453
DOI:10.1016/S1359-6454(98)00222-5