Edge stresses in alumina/zirconia laminates
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abstract
Using the technique of fluorescence piezospectroscopy, we determine the distribution of thermal residual stresses across the edges of three laminated alumina/zirconia composites. We develop a methodology for separating the measured stress state into microstresses that result from graintograin thermal mismatch and macrostresses that result from laminationinduced thermal mismatch between individual plies. Comparison between the measured edgestress distributions and those calculated based on a simple forcesuperposition model shows good agreement, indicating that the laminate system is well approximated as linear elastic. Given the experimental confirmation of significant edge stresses in multiply laminates, the possibility of failure initiating at composite edges must be considered in the design of surfacecompressed laminate structures with the aim of mediating the detrimental effect of surface flaws.
