Abstract
The impact resistances and fracture mirror radii (rm) of rods of several ceramic materials were measured. The fracture stresses (σf) were determined from σf vs rm−1/2 curves obtained from fiexural strength tests. An analysis, based on the assumption that the principal factor contributing to the impact energy absorbed is the energy (Ue) required to deflect the specimen to the fracture stress, indicated that the impact energy absorbed (U) per unit of specimen cross-sectional area (A) increased in proportion to the square of the maximum stress. The analysis also indicated that the slopes of the curves of U/A vs σf2 are proportional to the reciprocal of Young's modulus. Experimental data for several materials are consistent with this analysis.
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