The results of an experimental investigation of damage in a symmetric 12-ply nicalon-reinforced calcium alumino-silicate (CAS) composite are reported. The initiation and evolution of damage under monotonic and cyclic loading is monitored using optical and scanning electron microscopy, compliance, and acoustic emission techniques. Damage thresholds are established for monotonic and cyclic loading conditions, and the bulk levels of damage are characterized using a modulus-based damage parameter.
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