Microscale elastic strain evolution following damage in Ti-SiC composites

Jay C. Hanan*, Geoffrey A. Swift, Ersan Üstündag, Irene J. Beyerlein, Jonathan D. Almer, Ulrich Lienert, Dean R. Haeffner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Fiber fractures are crucial in initiating damage zones that ultimately determine the strength and lifetime of fiber-reinforced metal matrix composites. The evolution of damage in a metal matrix composite (MMC) comprised of a row of unidirectional SiC fibers (32 vol pct) surrounded by a Ti matrix was examined, for the first time, using X-ray microdiffraction. Multiple strain maps including both phases were collected in situ under applied tensile stress. The elastic axial strains were then compared to predictions from a modified shear-lag model, which, unlike other shear-lag models, considers the elastic response of both constituents. The strains showed good correlation with the model. The results confirmed, for the first time, both the need and validity of this new model specifically developed for large scale multifracture simulations of MMCS. The results also provided unprecedented insight for the model, revealing the necessity of incorporating such factors as plasticity of the matrix, residual stress in the composite, and selection of the load sharing parameter.

Original languageEnglish
Pages (from-to)3839-3845
Number of pages7
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number12
Publication statusPublished - Dec 2002
Externally publishedYes


The authors are grateful to Dr. H. Deve, 3M Corp., for providing the specimens and helpful discussions about the properties of Ti-SiC composites. They also express their sincere gratitude to Dr. I.C. Noyan, IBM Watson Research Center, for the use of his stress fixture. This study was supported by the National Science Foundation (CAREER Grant No. DMR-9985264) at Caltech and a Laboratory-Directed Research and Development Project (No. 2000043) at Los Alamos. The work at the Advanced Photon Source was supported by the United States Department of Energy, Office of Basic Energy Sciences (Contract No. W-31-109-ENG-38).

FundersFunder number
Laboratory-Directed Research and Development Project2000043
Office of Basic Energy Sciences
United States Department of Energy
National Science FoundationDMR-9985264
Los Alamos National Laboratory


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