103 破損解析におけるフラクトグラフィの役割(設計・生産技術現場における強度信頼性と安全性の確保)

概要

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Fractography is one of the indispensable key technology for failure analysis in failed machine components and structures. In this paper, in the beginning, it is described on a brief history of fractography. It is also described on a role and a procedure of fractography in failure analysis. Then it is briefly described on the availability of fractography by use of a couple of examples analyzed by fractography. First some characteristics of failed hot forging die quantitatively analyzed by use of stretched zone width are exemplified. Then characteristics of corrosion fatigue failure of steam turbine blades such as corrosion pit at initiation area and intergranular fracture at propagation area are also demonstrated. The possibility of quantitative analysis of corrosion fatigue fracture surface by use of brittle striation spacing also demonstrated based upon the quantitatively analyzed data of corrosion fatigue fracture surface of ship structural steel in sour crude oil environment. Finally future Problems on fractography are touched in brief.
一般社団法人日本機械学会の論文
2001-03-27