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Hiroshima University School of Dentistry, Hiroshima, japan The stress di^lrihution in bond layers of two different thicknesses (50 |j.ni and 200 Jim) was calculated by finite clement analysis for pairs of rectangular crn^Ls section metal bars bunded to each other and subjected tu four point bending. These stresses were used to aid in identification of the failure origin by use of the Weibull risk-of-raplurc (RR) functitm. Bj' use of the stress distributions, the characteristic strength from 50 p.in iKind test specimens could be correlated with that for 200 jirn bond test specimens when the failure was assumed to have an intorfacial origin. The finite element meshes were refined twice and the ruiios of characierisiic strengths were recalculated and rciTiHined virtually unchanged liy each of the mesh refincntciils. Flencc, the identification of the interface as the failure origin remained consistent^ Further, the use of stresses extrapolated to zero mesh size also produced the same ratios. Therefore, the RR calculations do not appear to be sensitive lu the mesh sizes used for the stress calculations when the meshes are comparable or when changed in a comparable manner. The results show this method can be consistent and a useful adjunct for idcntificaiion of failure origins.

Identification of failure origin through testing and the Weibull risk-of-rupture