QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 2434-8252
Print ISSN : 0288-4771
Strength Mismatch Effects on Charpy Absorbed Energy and CTOD Fracture Toughness
Yusuke ItoYasuhito TakashimaFumiyoshi Minami
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2017 Volume 35 Issue 2 Pages 61s-65s

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Abstract

In order to examine the difference between the sensitivity of Charpy absorbed energy, VE, and critical CTOD, δcr, to strength mismatch in welds, the numerical analysis was conducted. This study adopted the evaluation method based on the Weibull stress criterion for calculation of VE and δcr assuming that the critical Weibull stress at brittle fracture is independent of the strength mismatch as well as the loading rate. This analysis showed that the VE and δcr decreased as the location of the V-notch or crack approached welded interface. The change in VE was larger than that in δcr, because the strength mismatch caused acceleration of strain rate and decrease in temperature rise near the V-notch as well as plastic constraint. This result indicates that the sensitivity of the VE and δcr to strength mismatch is different depending on the loading rate.

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© 2017 by JAPAN WELDING SOCIETY
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