Damage evolution in creep of SCS-6/Ti-24Al-11Nb metal-matrix composites
- Dayton Univ., OH (United States)
An experimental study is presented of the creep behavior of a model SCS-6/Ti-24Al-11Nb composite with the main objective of understanding its damage evolution under sustained loading at high temperature. Tensile creep tests were conducted in the 650-815 C temperature range. All tests were conducted in laboratory air on specimens fabricated from unidirectional panels. The specimens were loaded with tensile axis parallel to (0) fiber. The strain vs. time plot showed three distinct stages of deformation-creep-like behavior. The total creep strain to failure was found to be less than the strain for fiber failure. Matrix cracking and cracking of the edge fibers were found to initiate as early as in the primary stage. There was indication of load transfer from matrix to fiber all along the primary region. Evidence of fiber failure was observed as early as in the initial part of the secondary stage. Crack linking and formation of a single dominant crack were found to be the main features in the early part of the tertiary stage. The single dominant crack finally leads to creep rupture upon continued testing. 5 refs.
- OSTI ID:
- 6255633
- Journal Information:
- Journal of Reinforced Plastics and Composites; (United States), Journal Name: Journal of Reinforced Plastics and Composites; (United States) Vol. 12:3; ISSN 0731-6844; ISSN JRPCDW
- Country of Publication:
- United States
- Language:
- English
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