Effects of off-axis loading on the tensile behavior of a ceramic-matrix composite
- Georgia Inst. of Tech., Atlanta, GA (United States). G.W. Woodruff School of Mechanical Engineering
- Harvard Univ., Cambridge, MA (United States). Div. of Applied Sciences
A 0{degree}/90{degree} ceramic-matrix composite (CMC) comprised of Nicalon fibers in magnesium aluminosilicate (MAS) has been loaded in tension in three orientations relative to the fiber direction: 0, 30, and 45{degree}. The off-axis loaded samples exhibit inelastic deformation at appreciably lower stresses than samples loads at 0{degree}. Matrix cracking governs the inelastic strains in all orientations. But, important differences in the morphologies and sequencing of the cracks account for the differences in the stress levels. Off-axis failure also occurs at substantially lower stresses than on-axis failure. On-axis composite failure is governed by fiber fracture, but off-axis failure involves matrix-crack coalescence. To facilitate interpretation and modeling of these behaviors, the interface friction and debond stresses have been determined from hysteresis measurements.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 422716
- Journal Information:
- Journal of the American Ceramic Society, Vol. 79, Issue 12; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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