G0310706 ASTM試験法による水素ガス中破壊じん性測定における問題点([G031-07]材料力学部門一般セッション:環境と材料,材料力学部門)

Translated title of the contribution: G0310706 Discussion on the Fracture Toughness Measurement in Gaseous Hydrogen on ASTM Test Method

井藤賀 久岳, 濱田 繁, 松岡 三郎

Research output: Contribution to journalArticle

Abstract

The fracture toughness, J_<Ic>, of SCM435 was investigated in 115 MPa hydrogen gas, 0.7 MPa hydrogen gas and air at room temperature. J_<Ic>ig tests were conducted in accordance with the ASTM E1820. J_<Ic>ig in 115 MPa hydrogen gas was much smaller than in 0.7 MPa hydrogen gas and air. In air, a stretched zone was formed at the tip of the fatigue pre-crack, followed by dimples. In hydrogen gas, quasi-cleavage instead of stretched zone and dimples were formed at the pre-crack tip. The fracture toughness test shown in 0.7 MPa hydrogen gas is the same as that shown in a fatigue crack growth test in 0.7 MPa hydrogen gas at a number of cycles of n = 1 and stress ratio of R = 0; and thus J_<Ic>ig in hydrogen gas is not the real fracture toughness.
Translated title of the contributionG0310706 Discussion on the Fracture Toughness Measurement in Gaseous Hydrogen on ASTM Test Method
Original languageJapanese
Pages (from-to)_G0310706--_G0310706-
Journal年次大会
Volume2014
Issue number0
DOIs
Publication statusPublished - 2014

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