This paper considers the multi-axial stress-strain-failure response of two commercially woven ceramic matrix composites. The different failure mechanisms of uni-axially stressed tows and woven composites are addressed. A model is postulated in which the local transverse and shear stressing, arising from the weave, instantaneously deactivate wake debonding and fiber pullout and initiates dynamic fiber failure; hence, triggering catastrophic failure of the axially stressed region of the tow. The model is shown to predict experimentally measured stress-strain-failure results for the woven composites considered. Simple stress-strain-failure models are also proposed for tows subjected to axial-transverse and axial-shear loadings, but due to the lack of experimental data they have not been validated.
Issue Section:
Research Papers
Keywords:
ceramics,
failure (mechanical),
shear strength,
stress-strain relations,
woven composites,
CMCs,
tows,
multi-axial loading,
fiber pullout deactivation,
stress-strain response
Topics:
Ceramic matrix composites,
Failure,
Fibers,
Stress,
Wakes,
Composite materials,
Shear stress
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.Copyright © 2011
by American Society of Mechanical Engineers
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