Abstract
Fracture toughness tests under impact loading and ordinary loading were conducted by using notched and pre-cracked specimens of sintered alumina. The residual stress near the fracture surface was measured by X-rays. The values of fracture toughness and the residual stress distribution obtained by instrumented impact Charpy tests were nearly identical to those obtained by standard fracture toughness tests. The plastic zone size, wy was determined on the basis of the residual stress distribution beneath the fracture surfaces. The size was related to the fracture toughness value Kp and the bending strength OB through:wy = 0.048 (Kp / σ8)2For a plunger broken during service, the plastic zone size and the stress intensity factor were estimated from the residual stress distribution.
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