Prediction of Brittle Fracture from Defects at Groove Face of Complete Joint Penetration Welded Joints
Prediction of Brittle Fracture from Defects at Groove Face of Complete Joint Penetration Welded Joints
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全焊缝坡口面缺陷预测脆性断裂
DOI：
10.1007/s40194-016-0334-8
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Azuma;K.;Akahoshi;T.;Iwashita;T.
本文讨论了用威布尔应力法代替韧性标度模型法预测焊缝端部缺陷处脆性断裂的适用性。梁-横隔板节点模型，它的目的是代表一个连接的I形截面梁RHS柱成员通过隔膜，在循环荷载下进行了测试。梁翼缘和横隔板之间的连接采用全接头熔透坡口焊。试样在梁底部翼缘的焊缝根部存在不连续性，这些不连续性是通过在焊接前将铜板插入槽中或通过使用电火花线切割加工产生的。利用有限元分析方法对不同缺陷尺寸下的脆性断裂进行了预测。用临界威布尔应力预测的断裂力矩与含气孔等缺陷试件的试验结果相吻合。
This paper concerns the applicability of the Weibull stress approach, instead of toughness scaling model approach, for prediction of brittle fracture initiated at defects existing at the weld terminations. Beam-to-diaphragm joint models, which were designed to represent a connection of an I-section beam to RHS column member with through diaphragms, were tested under cyclic loads. Complete joint penetration groove welds were used for the connection between the beam flange and the diaphragm. Specimens had those discontinuities at the roots of welds to the beam bottom flanges, which were created by inserting copper plates into the grooves before welding or by using wire electrical discharge machining. The prediction of brittle fracture with a variety of defect sizes by using the FE analysis was conducted. The fracture moment predicted by using the critical Weibull stress accorded with the test results of specimen with defects such as the blowhole.