OS0605 高清浄度弁ばね鋼の超高サイクル回転曲げ疲労特性に関する研究(OS6-2 内部破壊とそのメカニズム,OS-6 金属材料の超高サイクル疲労と信頼性評価)

概要

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In order to investigate the very high cycle fatigue properties of high cleanliness valve spring steel, rotating bending fatigue tests were performed by means of dual-spindle rotating bending fatigue testing machine. Fracture surfaces of failed specimens were observed by a scanning electron microscope (SEM) and fracture mechanisms of this material were discussed from view points of fractography and fracture mechanics. As results, it was found that the interior-initiated fracture would occur even for specimens without non-metallic inclusions inside the material. This fact suggests that the interior clack takes place at a certain kind of microstructural defect.
一般社団法人日本機械学会の論文
2011-07-16