金属-セラミック複合材料の動的破壊靭性評価

抄録

Fracture behavior of a newly developed metal-ceramic composite has been studied. Especially the effect of impact loading has been mainly studied and fracture mechanics analysis has been carried out.
The dynamic fracture toughness at room temperature of a metal-ceramic composite has been evaluated by the absorbed energy method and by the impact load obtained from an instrumented Charpy type impact test which can easily evaluate the dynamic fracture toughness of materials.
The fracture strength of brittle material is generally apt to have values widely varied, and therefore, the value of the fracture toughness of this material should be defined statistically. Thus, its dynamic fracture toughness has been analyzed by Weibull distribution which is popularly used for the statistical analysis of the fracture strength. As a result, K_I^dyn value evaluated from Kalthoff’s formula has been found to be most reliable. Moreover, the critical flaw size has been estimated in the unnotched specimen. As a result, the flaw size has corresponded to the acicular ceramic particle size.