Mechanical behavior of a fiber reinf orced ceramic composite under off-axis loading

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Abstract
The mechanical behavior and damage mechanisms of a unidirectional fiber reinforced ceramic composite (Corning's Nicalon/CAS III) was investigated under off-axis tensile loading. Specimens with six orientations (0, 15, 30, 45, 60 and 90°) of fibers with respect to loading direction were tested. Acoustic emission and replication techniques were used to monitor the initiation and progression of damage. The 0 and 15° specimens had initiation of matrix cracking during the linear portion of the stress-strain curve. The 30, 45, 60 and 90° specimens had no matrix cracking or nonlinearity in their stress-strain curves before the final failure. The test results showed that the maximum stress and Tsai-Hill failure criteria can be used to predict the failure strength of fiber reinforced ceramic composites under off-axis loading. Also, the present transformation relations for the off-axis Young's modulus and Poisson's ratio are applicable to the fiber reinforced ceramic matrix composite.