Effects of off-axis loading on the tensile behavior of a ceramic-matrix composite

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08085.x· OSTI ID:422716

Lynch, C S ^[1]; Evans, A G ^[2]

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1. Georgia Inst. of Tech., Atlanta, GA (United States). G.W. Woodruff School of Mechanical Engineering
2. 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, Journal Name: Journal of the American Ceramic Society Journal Issue: 12 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM SILICATES
COMPOSITE MATERIALS
EXPERIMENTAL DATA
FIBERS
FRICTION
INTERFACES
MAGNESIUM SILICATES
OPTICAL MICROSCOPY
ORIENTATION
SAMPLE PREPARATION
SILICON CARBIDES
STRAIN GAGES
STRESSES
TENSILE PROPERTIES