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Postfailure subsidiary cracking from indentation flaws in brittle materials

Published online by Cambridge University Press:  31 January 2011

Nitin P. Padture
Nitin P. Padture
Affiliation:
Materials Science and Engineering Laboratory, National Institutes of Standards and Technology, Gaithersburg, Maryland 20899
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Abstract

Vickers indentation sites in ceramics have been examined after specimen failure from median/radial indentation cracks. Evolution of a new cracking pattern of “ortho-lateral” cracks, originating at the intact corners of the Vickers indentation and running orthogonal to the classic-lateral cracks and parallel to the new fracture surface, has been observed. In some instances postfailure extension of the classic-lateral cracks toward the surface was also observed. Enhanced residual tensile stress from relaxation of constraints on the indentation-plastic cavity by the generation of a fracture surface is postulated to drive the subsidiary cracking. A simple qualitative model to explain this phenomenon is presented. Possible implications of such postfailure subsidiary cracking on residual-stress-driven flaws, postmortem fractography, and wear in ceramics are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 6 , June 1993 , pp. 1411 - 1417
Copyright
Copyright © Materials Research Society 1993

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References

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