SYMPOSIA PAPER Published: 01 January 1996

Time-Dependent Deformation of Titanium Metal Matrix Composites


A three-dimensional finite element program called VISCOPAC was developed and used to conduct a micromechanics analysis of titanium metal matrix composites. The VISCOPAC program uses a modified Eisenberg-Yen thermo-viscoplastic constitutive model to predict matrix behavior under thermomechanical fatigue loading. The analysis incorporated temperature-dependent elastic properties in the fiber and temperature-dependent viscoplastic properties in the matrix. The material model was described and the necessary material constants were determined experimentally. Fiber-matrix interfacial behavior was analyzed using a discrete fiber-matrix model. The thermal residual stresses due to the fabrication cycle were predicted with a failed interface. The failed interface resulted in lower thermal residual stresses in the matrix and fiber. Stresses due to a uniform transverse load were calculated at two temperatures, room temperature and an elevated temperature of 650°C. At both temperatures, a large stress concentration was calculated when the interface had failed. The results indicate the importance of accurately accounting for fiber-matrix interface failure and the need for a micromechanics-based analytical technique to understand and predict the behavior of titanium metal matrix composites.

Author Information

Bigelow, CA
FAA Technical Center, Atlantic City International Airport, Atlantic City, NJ
Bahei-El-Din, YA
University of Cairo, Cairo, Egypt
Mirdamadi, M
Analytical Services and Material, Hampton, VA
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Developed by Committee: D30
Pages: 278–296
DOI: 10.1520/STP18228S
ISBN-EB: 978-0-8031-5320-2
ISBN-13: 978-0-8031-2039-6