表面直接反射形コースティックス法によるジルコニウムセラミックスの動的応力拡大係数の解析

概要

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We constructed a dynamic fracture testing apparatus of caustics combining an ultrahigh-speed camera, Imacon 790, and a laser light source of 2 mW, and tried to apply the direct surface reflection caustic method to zirconium ceramic plates in order to investigate the dynamic fracture behavior using this system. Consequently, it is shown that the clear caustic patterns which are formed by direct surface reflection light under a dynamically loaded condition can be obtained and the applicability of this technique to dynamic fracture problems of ceramic materials is confirmed. Dynamic fracture toughness K_Id and the crack-propagation fracture toughness K_ID are determined from a sequence of caustic patterns. The dependence of K_Id on the stress intensity rate K and the relationship between K_ID and the crack velocity a of this material are revealed. Finally, we attempt to evaluate the crack arrest toughness value K_Ia by means of this technique.
社団法人日本機械学会の論文
1992-05-25