Third M.I.T. Conference on Computational Fluid and Solid Mechanics June 14–17, 2005  

A multiscale modeling approach to fatigue damage in discontinuous fiber polymer composites1

Ba Nghiep Nguyen*, Brian J. Tucker, Mohammad A. Khaleel
Pacific Northwest National Laboratory, PO Box 999, Richland, WA 99352, USA

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The damage process in composite materials occurs at different length scales, ranging from the scale of the constituents and defects (microscale ) to that of a composite structure (macroscale ). This paper develops a multi-scale mechanistic approach to fatigue damage in discontinuous-fiber polymer composites. The approach accounts for the damage mechanisms in addition to the constituents' properties and characteristics. It links these micro-features to the behavior of the composite structure through a series of scale transitions using computational techniques that are based on micromechanical modeling, a thermodynamics-based formulation and finite element analysis.

Keywords:  Multiscale modeling; Fatigue; Damage; Discontinuous fiber composites; Matrix cracking; Fiber/matrix debonding

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