Impact damage and fatigue behavior of gamma TiAl
- Univ. of Michigan, Ann Arbor, MI (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
The relationship between impact damage and the fatigue behavior of gamma titanium aluminide has been examined. Axial fatigue specimens fabricated from cast Ti-47.9Al-2Cr-2Nb alloy and Ti-47.3Al-2.2Nb-0.5Mn-0.4W-0.4Mo-0.23Si alloy were impacted under controlled conditions with various indentor shapes to simulate manufacturing related damage in low pressure turbine blades. Damage was quantified and related to impact parameters. A measure of the ambient temperature fatigue strength in the damaged specimens was obtained by standard fatigue testing employing a step-loading approach. Fractographic studies were performed to differentiate impact damage from subsequent fatigue crack growth and to elucidate the mechanisms responsible for the dependence of fatigue strength on the severity of impact damage. A threshold-based fracture mechanics analysis of crack advance from damage zones, and its use in fatigue failure strength prediction, has been developed.
- OSTI ID:
- 293103
- Report Number(s):
- CONF-970980-; ISBN 0-87339-382-1; TRN: IM9902%%118
- Resource Relation:
- Conference: Materials Week `97, Indianapolis, IN (United States), 14-18 Sep 1997; Other Information: PBD: 1997; Related Information: Is Part Of High cycle fatigue of structural materials. Proceedings; Soboyejo, W.O. [ed.] [Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering]; Srivatsan, T.S. [ed.] [Univ. of Akron, OH (United States). Dept. of Mechanical Engineering]; PB: 618 p.
- Country of Publication:
- United States
- Language:
- English
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