パンチ加工を受けた鉄鋼材料の強度特性低下とその加工部の材質変化の関係

Translated title of the contribution: Relationship between Strength Characteristics Deterioration and Material Characteristics Change of Punching Processed Steel

新留 浩太朗, 張 珂謹, 濱田 繁, 横井 龍雄, 野口 博司

Research output: Contribution to journalArticle

Abstract

<p>In steel products, the tensile strength and fatigue limit characteristics may be degraded by a punching process, and the extent of the decrease differs depending on the steel type. During static tensile loading, unstable brittle fractures can occur in the area of elastic deformation despite ductile materials. A crack along with the place with the highest shear stress first initiates when tensile loading is applied to the punched material. Furthermore, this crack initiated when a load of about two thirds of the tensile strength is applied, which is considered to charge in the tensile strength characteristics of the punched material. In the case of drill holed materials, the shear crack does not initiate. Therefore, the cause of the shear crack is considered to be in the shear-affected-zone (SAZ) by the punching process. In this study, observation of the SAZ and intermittence tensile tests were conducted on dual phase steel and precipitation harden steel to compare the two tests quantitatively. It was shown that plastic strain in the SAZ might be the cause of deterioration of the strength characteristics.</p>
Translated title of the contributionRelationship between Strength Characteristics Deterioration and Material Characteristics Change of Punching Processed Steel
Original languageJapanese
Pages (from-to)PS20
JournalM&M材料力学カンファレンス
Volume2019
Issue number0
DOIs
Publication statusPublished - 2019

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