An elastic failure model of indentation damageA mechanistically consistent model for indentation damage based on elastic failure at tensile or shear overloads, is proposed. The model accommodates arbitrary crack orientation, stress relaxation, reduction and recovery of stiffness due to crack opening and closure, and interfacial friction due to backward sliding of closed cracks. This elastic failure model was implemented by an axisymmetric finite element program which was used to simulate progressive damage in a silicon nitride plate indented by a tungsten carbide sphere. The predicted damage patterns and the permanent impression matched those observed experimentally. The validation of this elastic failure model shows that the plastic deformation postulated by others is not necessary to replicate the indentation damage of brittle structural ceramics.
Document ID
19850042020
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Liaw, B. M. (Washington Univ. Seattle, WA, United States)
Kobayashi, A. S. (Washington Univ. Seattle, WA, United States)
Emery, A. F. (Washington, University Seattle, WA, United States)