Abstract
The effect of macroscopic residual stresses on the fracture resistance and stable/unstable crack growth in Si 3N 4/Si 3N 4–30 wt% TiN layered ceramics has been investigated. The laminates were manufactured using rolling and hot pressing techniques. An apparent fracture toughness K app was calculated as a function of the crack length parameter ã = Y( α) a 1/2 for the laminates with residual compressive or tensile stresses in the top layers. The toughness increases in the layers with a compressive stress with increasing crack length, and it decreases in the layers with a tensile stress as the crack continues to grow. An explanation for the experimentally measured and calculated K app values is proposed. The existence of the threshold stress and the stable/unstable crack growth conditions is discussed.
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