A nonintrusive technique using scanning laser acoustic microscopy (SLAM) for measuring the localized strain of ceramics was developed for a LAS monolithic, a SiC/LAS monofilament composite, and a SiC/CAS unidirectionally reinforced composite. The localized strain analysis was used to assess residual stresses due to processing. A correlation between the relaxation stress and the fracture behavior of each material was found and shown to correspond to matrix microcracking and secondary cracks.
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