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Transformation zones, crack shielding, and crack-growth resistance of Ce-TZP/alumina composite in mode II and combined mode II and mode I loading by Guang-Yong Lin; Dinesh K Shetty is a Engineering article available to read on EtoBox.

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Crack-tip transformation zones, crack shielding and crack-growth-resistance (R-curve) behaviors of a transformation-toughened ceria-partially stabilized zirconia-alumina (Ce-TZP/alumina) composite were studied in mode II and combined mode I and mode II loading using compact-tension-shear (CTS) specimens. The mode II and mode I stress intensities for both the initial straight cracks and the subsequent kinked cracks were assessed by the method of caustics using geometrically equivalent specimens of polymethyl methacrylate (PMMA). The angle of formation of the transformation zones as well as of extension of the cracks increased systematically with increasing ratio of the mode II and the mode I stress intensities and approached a value of h à 1⁄4 À72°in pure mode II loading. This angle was close to the angle for maximum hoop tension in the stress field of a mode II crack (h à 1⁄4 À70:5°). A crack-initiation toughness envelope was constructed on a K I -K II diagram using the critical loads for incremental crack extension. The crackinitiation toughness in pure mode II loading was less than the corresponding toughness in mode I loading. This result was consistent with calculations that in

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Author

Guang-Yong Lin; Dinesh K Shetty

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0013-7944)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)