SYMPOSIA PAPER Published: 01 January 1993
STP24249S

Analysis of Thermomechanical Cyclic behavior of Unidirectional Metal Matrix Composites

Source

An analytical tool is developed to determine the three-dimensional stress state in a unidirectional composite subjected to axial loading and changes in temperature. A finite difference method is used to analyze a representative volume element of the composite which consists of concentric cylinders. The constituents are assumed to be elastic-plastic materials having temperature dependent properties. An iterative technique using the Prandtl-Reuss flow rule to determine incremental plastic strains is implemented in a computer code capable of predicting the axisymmetric triaxial stresses in a composite under thermomechanical fatigue (TMF) loading conditions. The model is verified with finite element method calculations for the problem of thermal residual stresses resulting from cool-down from the processing temperature. Results for several TMF loading conditions are compared with experimental data and 1-D predictions for a SCS-6 silicon carbide fiber and Ti-24Al-11Nb matrix composite. Significant differences are noted between results based on 1-D and 3-D approximations to the stress state in a composite and are discussed in detail.

Author Information

Coker, D
University of Dayton, Research Institute, Dayton, OH
Ashbaugh, NE
University of Dayton, Research Institute, Dayton, OH
Nicholas, T
Wright Laboratory, Wright-Patterson AFB, OH
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Details
Developed by Committee: E08
Pages: 50–69
DOI: 10.1520/STP24249S
ISBN-EB: 978-0-8031-5239-7
ISBN-13: 978-0-8031-1871-3