疲労き裂伝ぱ寿命がばらつかなくなるき裂長さの定量的予測

Translated title of the contribution: Quantitative prediction of crack length where fatigue crack propagation life has no scatter

相原 将敬, 濱田 繁, 野口 博司

Research output: Contribution to journalArticle

Abstract

<p>The fatigue crack growth behavior is not reproducible when a crack initiates and grows in a smooth material at a constant stress amplitude. However, a reproducible crack length <i>L</i><sub>0</sub> has been reported in which the variation in fatigue crack growth rate converges by observation of the crack growth behavior on the specimen surface. However, <i>L</i><sub>0</sub> volume has not been predicted quantitatively and the physical meaning of <i>L</i><sub>0</sub> is unknown, so it cannot be used in the design. Therefore, the authors analyzed the <i>L</i><sub>0</sub> quantitatively by analyzing the growth behavior of the three-dimensional crack front shape which grows inside the material. The aim is to develop a quantitative prediction method for <i>L</i><sub>0</sub> by analyzing the growth behavior by changing the crack front shape quantitatively. As a result, for the fatigue crack with the ideal crack shape, the possibility of the fatigue crack growth mechanism proposed by the authors was shown. For the complicated shape of the fatigue crack front shape, which depends on the hardness of the microstructures that randomly arranged in front of the fatigue crack, the difference of the stress intensity factor was explained by mechanics. It was shown that the possibility that <i>L</i><sub>0</sub> physically exists in the fatigue crack with the ideal crack front shape analyzed in this study.</p>
Translated title of the contributionQuantitative prediction of crack length where fatigue crack propagation life has no scatter
Original languageJapanese
Pages (from-to)OS0304
JournalM&M材料力学カンファレンス
Volume2019
Issue number0
DOIs
Publication statusPublished - 2019

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