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To develop reasonable analytical models and to understand better how the integrity of the fiber-matrix interface in high temperature titanium-based metal-matrix composites affects the overall transverse normal characteristics, a parametric study of various fiber-matrix interface conditions was performed. Analysis methods included both a simplified one-dimensional mathematical model and a finite element analysis using MSC/NASTRAN. First, both strong (perfectly bonded) and vanishingly weak (unbonded) interfaces were examined. Subsequently, to provide for partial bonding, a model that used an elastic-plastic interphase zone between the fiber and matrix was examined. It was found that the variation in the plastic properties (that is, yield stress and strain hardening) of this interphase zone provided the flexibility to model any level of interfacial bonding.
Captain, USAF, Air Force Institute of Technology, Wright-Patterson AFB, OH
Professor and head, Air Force Institute of Technology, Wright-Patterson AFB, OH
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