Mode-II shielding-curve of Al2O3 from measurement of cone crack angles
- 50 Downloads
Many ceramic materials exhibit the effect of an increasing crack growth resistance during crack extension. Especially in the case of coarse-grained materials, cracks generally follow the grain boundaries, leave the original crack plane and produce a crack-face roughness. In the theoretical analysis forces transmitted by local links between the two crack faces are smoothed and replaced by so-called continuous bridging stresses acting against the crack opening. As the consequence of such bridging stresses, there exists a shielding stress intensity factor term that shields the crack tip partially from the applied loads. This effect as a reason for the occurrence of R-curves is well documented in literature for cracks under pure mode-I loading conditions .
In addition it has to be expected that crack-face interactions will also affect crack extension under pure or superimposed mode-II loading as for instance outlined in literature for frictional crack-face interactions [2, 3, 4]. In ...
KeywordsStress Intensity Factor Crack Length Cone Angle Shear Traction Applied Stress Intensity Factor
- 7.Munz D, Fett T (1999) CERAMICS, failure, material selection, design. Springer-Verlag, HeidelbergGoogle Scholar