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Mapping of scatter in fatigue life assessment of welded structures—a round-robin study
Welding in the World ( IF 2.1 ) Pub Date : 2021-03-17 , DOI: 10.1007/s40194-021-01099-y
Gustav Hultgren , Mansoor Khurshid , Peter Haglund , Zuheir Barsoum

A round-robin study has been carried out within a national project in Sweden with the addition of an international participant, where several industrial partners and universities are participating. The project aims to identify variation and sources of variation in welding production, map scatter in fatigue life estimation, and define and develop concepts to reduce these, in all steps of product development. The participating organisations were asked to carry out fatigue life assessment of welded box structures, which is a component in load-carrying structures. The estimations of fatigue life have also been compared with fatigue test results. Detailed drawings, loads and material data were also given to the participants. The participants were supposed to use assessment methods based on global and local stresses using the design codes or recommendations they currently use in-house. Differences were identified between both methods and participants using the same codes/recommendations. Applicability and conditions from the cases in the codes were also identified to be differently evaluated between the participants. It could be concluded that for the applied cases the nominal stress method often overestimated the fatigue life and had a high scatter in the estimations by different participants. The effective notch method is conservative in comparison to the life of tested components with little scatter between the results derived by the participants.



中文翻译:

焊接结构疲劳寿命评估中的散点图—循环法研究

在瑞典的一个国家项目中进行了一项轮循研究,另外还有一个国际参与者,几个工业合作伙伴和大学都参加了该参与者。该项目旨在在产品开发的所有步骤中,识别焊接生产中的变化和变化的来源,在疲劳寿命估算中绘制散布图,并定义和开发减少这些变化的概念。要求参与组织对焊接箱结构进行疲劳寿命评估,而焊接箱结构是承载结构的组成部分。疲劳寿命的估计值也已与疲劳测试结果进行了比较。还向参与者提供了详细的图纸,载荷和材料数据。参与者应使用他们当前使用的设计规范或建议,根据全球和局部压力使用评估方法。方法和参与者之间使用相同的代码/建议确定了差异。准则中案例的适用性和条件也被确定为在参与者之间进行了不同的评估。可以得出结论,在实际应用中,名义应力法通常会高估疲劳寿命,并且不同参与者的估算值之间存在较高的分散性。与测试组件的寿命相比,有效的陷波方法是保守的,参与者获得的结果之间几乎没有分散。方法和参与者之间使用相同的代码/建议确定了差异。准则中案例的适用性和条件也被确定为在参与者之间进行了不同的评估。可以得出结论,在实际应用中,名义应力法通常会高估疲劳寿命,并且不同参与者的估算值之间存在很大的差异。与测试组件的寿命相比,有效的陷波方法是保守的,参与者获得的结果之间几乎没有分散。方法和参与者之间使用相同的代码/建议确定了差异。准则中案例的适用性和条件也被确定为在参与者之间进行了不同的评估。可以得出结论,在实际应用中,名义应力法通常会高估疲劳寿命,并且不同参与者的估算值之间存在很大的差异。与测试组件的寿命相比,有效的陷波方法是保守的,参与者获得的结果之间几乎没有分散。可以得出结论,在实际应用中,名义应力法通常会高估疲劳寿命,并且不同参与者的估算值之间存在很大的差异。与测试组件的寿命相比,有效的陷波方法是保守的,参与者获得的结果之间几乎没有分散。可以得出结论,在实际应用中,名义应力法通常会高估疲劳寿命,并且不同参与者的估算值之间存在很大的差异。与测试组件的寿命相比,有效的陷波方法是保守的,参与者获得的结果之间几乎没有分散。

更新日期:2021-03-17
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