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Apparent fracture toughness of Si3N4-based laminates with residual compressive or tensile stresses in surface layers
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UNSPECIFIED (2005) Apparent fracture toughness of Si3N4-based laminates with residual compressive or tensile stresses in surface layers. ACTA MATERIALIA, 53 (2). pp. 289-296. doi:10.1016/j.actamat.2004.09.022 ISSN 1359-6454.
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Official URL: http://dx.doi.org/10.1016/j.actamat.2004.09.022
Abstract
The effect of macroscopic residual stresses on the fracture resistance and stable/unstable crack growth in Si3N4/Si3N4-30 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 a = Y(alpha)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,,pp values is proposed. The existence of the threshold stress and the stable/unstable crack growth conditions is discussed. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TN Mining engineering. Metallurgy |
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Journal or Publication Title: | ACTA MATERIALIA | ||||
Publisher: | PERGAMON-ELSEVIER SCIENCE LTD | ||||
ISSN: | 1359-6454 | ||||
Official Date: | January 2005 | ||||
Dates: |
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Volume: | 53 | ||||
Number: | 2 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 289-296 | ||||
DOI: | 10.1016/j.actamat.2004.09.022 | ||||
Publication Status: | Published |
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