Determination of the R?Curve from the Strength?XIndentation Load Relation
Journal
Journal of the American Ceramic Society
Journal Volume
78
Journal Issue
8
Pages
2237-2239
Date Issued
1995
Author(s)
Abstract
Strength as a function of indentation load has been measured to evaluate toughness versus crack size curves (i.e., R?curves) of ceramics. In the past, this evaluation is achieved by generating a family of global stress intensity versus crack size curves (i.e., K?curves) at each indentation load and its corresponding strength, and then fitting an envelope of tangency points to these curves. This envelope yields the R?curve. A methodology is proposed in the present study to define the point in the K?curve at which the R?curve intersects. This methodology complements the conventional ¡§tangency condition¡¨ approach in determining the R?curve from the experimental strength?indentation load relation. Copyright ? 1995, Wiley Blackwell. All rights reserved
Type
journal article