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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.7: Operations, Applications, and Components >FRACTURE ASSESSMENT OF WELDED JOINT WITH GEOMETRICAL DISCONTINUITY USING THE WEIBULL STRESS
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FRACTURE ASSESSMENT OF WELDED JOINT WITH GEOMETRICAL DISCONTINUITY USING THE WEIBULL STRESS

机译：威布尔应力的几何不连续性焊接接头断裂评估

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Recently the Weibull stress is used as a fracture driving force parameter in fracture assessment. The Weibull stress is derived from a statistical analysis of local instability of micro cracks leading to brittle fracture initiation. The critical Weibull stress is expected to be a critical parameter independent of the geometrical condition of specimens.Fracture toughness test using 3-point bending and tensile tests of welded joint specimens with geometrical discontinuity were conducted in order to study the applicability of fracture assessment procedure based on Weibull stress criterion. Steel plates prepared for this study had tensile strength of 490 Mpa for structural use. Two kinds of welded joint specimens, "one-bead welded joint" and "multi-pass welded joint" were prepared for fracture toughness test by using gas metal arc welding. In tensile test specimen, corner flaws were introduced at the geometrical discontinuity part at where stress concentration is existed. Three dimensional elastoplastic finite element analyses were also carried out using the welded joint specimen models in order to calculate the Weibull stress. The critical loads for brittle fracture predicted by the Weibull stress criterion from CTOD test results of one-bead and multi-pass welded joint specimens show fairly good agreement with experimental results of welded joint specimens with geometrical discontinuity.
机译：最近，在断裂评估中将威布尔应力用作断裂驱动力参数。威布尔应力来自对导致脆性断裂开始的微裂纹的局部不稳定性的统计分析。 Weibull应力是与试样几何条件无关的关键参数。为了研究断裂评估程序的适用性，采用具有几何不连续性的焊接接头试样进行了三点弯曲和拉伸试验，以进行断裂韧性试验。根据Weibull应力准则。为本研究准备的钢板的抗拉强度为490 Mpa，可用于结构用途。制备了两种焊缝试样：“单焊缝焊缝”和“多道焊缝”，以利用气体保护金属弧焊进行断裂韧性测试。在拉伸试样中，在存在应力集中的几何不连续部分引入了拐角缺陷。为了计算威布尔应力，还使用焊接接头样本模型进行了三维弹塑性有限元分析。由Weibull应力准则根据单焊道和多道次焊接接头试样的CTOD测试结果预测的脆性断裂临界载荷与几何不连续的焊接接头试样的实验结果显示出相当好的一致性。

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