Strength Mismatch Effects on Charpy Absorbed Energy and CTOD Fracture Toughness
Strength Mismatch Effects on Charpy Absorbed Energy and CTOD Fracture Toughness
复制标题
强度失配对夏比吸收能和 CTOD 断裂韧性的影响
DOI：
10.2207/qjjws.35.61s
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Minami Fumiyoshi
中科院分区：
文献类型：
--
作者：
Ito Yusuke;Takashima Yasuhito;Minami Fumiyoshi
为了考察夏比吸收能VE和临界CTOD δcr对焊缝强度失配的敏感性之间的差异，进行了数值分析。采用基于Weibull应力准则的评价方法计算VE和δcr，假定脆性断裂的临界Weibull应力与强度失配和加载速率无关。分析表明，V型缺口或裂纹位置越靠近焊接界面，VE和δcr越小。由于强度失配导致V形缺口附近应变速率加快、温升降低以及塑性约束，VE的变化大于δcr。这一结果表明，VE和δcr对强度失配的敏感性取决于加载速率而不同。
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.