Title

Fracture criterion for bridging fibers in titanium metal matrix composites at elevated temperature

Document Type

Conference Proceeding

Date of Original Version

12-1-1994

Abstract

In this paper, a fracture criterion for bridging fibers in titanium metal matrix composites at elevated temperature is proposed. This criterion is based on the notion that in a composite subjected to cyclic loading, a competition exists between the evolving axial stress of a bridging fiber and its continuously decreasing fatigue strength. The stress build-up in the bridging fiber during fatigue crack growth of SM1240/Timetal-21S composite under different temperatures and loading frequencies is simulated using the finite element method. The life of bridging fibers was estimated from the knowledge of the fatigue crack growth behavior of the composite subjected to loading conditions similar to those used in the numerical simulation. Effects of the process-induced residual stress, test temperature and loading frequency were included in this simulation. Results of the study show that the build-up of the fiber stress is a time-dependent process while the degradation of the bridging fiber strength is both temperature and loading frequency dependent.

Publication Title

American Society of Mechanical Engineers, Materials Division (Publication) MD

Volume

51

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