ISSN: 0884-6804
Page Count: 8

Fiber Pushout Test: A Three-Dimensional Finite Element Computational Simulation
Chamis, CC
Senior aerospace scientist, NASA Lewis Research Center, OH

Mital, SK
Research associate, Institute for Computational Mechanics in Propulsion, NASA Lewis Research Center, OH

Abstract

A fiber pushthrough process has been computationally simulated using a three-dimensional (3-D) finite element method. The interphase material is replaced by an anisotropic material with greatly reduced shear modulus, such that the simulation becomes linear up to the fiber pushthrough load. Such a procedure is easily implemented and is computationally very effective. It can be used to predict fiber pushthrough load for a composite system at any temperature. The average interface shear strength obtained from pushthrough load can easily be separated into its two components: one that comes from frictional stresses and the other that comes from chemical adhesion between fiber and the matrix and mechanical interlocking that develops as a result of shrinkage of the composite because of phase change during the processing. Step-by-step procedures are described to perform the computational simulation, to establish bounds on interfacial bond, and to interpret interfacial bond quality.

Keywords:
fibers, interface, interphase, pushthrough, pushout, shear strength, bonding, simulation, residual stress, thermal stress

Paper ID: CTR10069J
DOI: 10.1520/CTR10069J
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