Some roles of mechanics in the prediction of life in metal matrix composites
- Texas A&M Univ., College Station, TX (United States)
In the current presentation the author will attempt to underscore the need for cooperative research between materials engineers and mechanicians by discussing the example of the much studied titanium matrix/silicon carbide fiber systems, commonly called TMC`s (titanium matrix composites). There are a variety of matrix materials under study, including Ti- 1 5-3, Ti-6-2-4-2, Ti Beta21 S, and a variety of titanium aluminides. The fiber is generally either SCS-6 or sigma. Both are trade names for CVD formed fibers; the former has a carbon substrate, whereas the latter has a tungsten substrate. Composites are fabricated from these constituents by a variety of techniques, including tape casting, powder mats, foil-fiber-foil hot pressing, HIPing, arc spraying, and plasma spraying. Complications arise from the fact that many of the titanium based matrix materials undergo substantial oxidation at temperatures in excess of 500/C. Prediction of life is clearly dependent on the development of an accurate processing model, as residual stresses develop during cool down. Since it is known that surface embrittlement due to oxidation can have a detrimental effect on life, it is also imperative to include this effect in life prediction models. Finally, the evolution of microstructural damage is a key to effective life prediction. The author will discuss recent research performed at Texas A&M University dealing with the thermomechanics of the above three effects. It will be shown that with an accurate mechanics framework predictions can be utilized to help develop improved models for predicting life in advanced continuous fiber MMC`S.
- OSTI ID:
- 175159
- Report Number(s):
- CONF-950686-; TRN: 95:006111-0071
- Resource Relation:
- Conference: Joint applied mechanics and materials summer meeting, Los Angeles, CA (United States), 28-30 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of AMD - MD `95: Summer conference; PB: 520 p.
- Country of Publication:
- United States
- Language:
- English
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