SEDL / STP / STP1315-EB / STP11879S

A Micromechanical Fatigue Damage Model for Unidirectional Metal-Matrix Composites

Voyiadjis, GZ
Boyd professor and doctoral student, Louisiana State University, Baton Rouge, LA

Echle, R
Boyd professor and doctoral student, Louisiana State University, Baton Rouge, LA

Pages: 19    Published: Jan 1997

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Abstract

Improvements in design and the enhancement in performance of aerospace vehicles calls for the development of advanced materials capable of sustaining the increasing loading conditions while maintaining their structural integrity. Special consideration must be given to the behavior of such materials under fatigue loading conditions that dominate the flight regime loads. A micromechanical fatigue damage model for unidirectional metal-matrix composites is proposed. Damage evolution is considered at the constituent level through the application of the Mori-Tanaka averaging scheme. Individual damage criteria for the constituents are proposed and employed to define damage evolution equations for each of the consultants. The numerical results for high cycle fatigue loading are presented for variations in the material and model parameters.