On creep of unidirectional fiber composites with fiber damage
- Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Mechanical Engineering
- Cornell Univ., Ithaca, NY (United States). Dept. of Theoretical and Applied Mechanics
The roles of broken fibers in the creep of continuous fiber reinforced composites are studied theoretically. The unidirectional fiber composite is modeled using a cylindrical cell consisting of a single broken fiber and a shell of the fiber material embedded in an elastic-power law creeping matrix. The time-dependent creep behavior of the composite is calculated using finite elements; both longitudinal and transverse loads are considered. It is shown that when fibers are broken, the increase in the overall creep strain of the composite and the axial stress in the intact fibers can be significant. It is also demonstrated that applied transverse tension can reduce the composite creep strain and the normal stress in the fibers: the opposite is true with applied transverse compression. Matrix plasticity is found to have very limited effect on the creep behavior of the composite. The accuracy of the McLean formula for undamaged composite is also examined.
- OSTI ID:
- 100626
- Journal Information:
- Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 7 Vol. 43; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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