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Abstract
Al2O3–ZrO2 and MgO–ZrO2 layered composites were fabricated in such a way that the outer layers of bar-shaped specimens consisted of the oxide (Al2O3 or MgO) and unstabilized ZrO2, while the bulk consisted of the oxide and partially stabilized ZrO2. During cool-down from the sintering or the annealing temperature, the outer layers expanded because of the tetragonal → monoclinic transition in ZrO2, thereby creating compressive stresses in the outer layers and tensile stresses in the bulk. Residual stresses were determined using a strain gage technique in which a strain gage was mounted on one face while the opposing face was incrementally ground off. Measurement of the strain as a function of thickness permitted the evaluation of residual stresses using pertinent equations from simple beam theory.
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