Multiaxial Fatigue Study on Transversal Attachments under constant amplitude proportional and non-proportional loadings
Multiaxial Fatigue Study on Transversal Attachments under constant amplitude proportional and non-proportional loadings
复制标题
等幅比例和非比例载荷下横向附件的多轴疲劳研究
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
A. Nussbaumer
中科院分区：
文献类型：
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作者：
Martin Garcia;C. Baptista;A. Nussbaumer
在本研究中，评估了全尺寸横向附件的多轴疲劳强度，并与原始实验结果和文献中发现的其他结果进行了比较。采用低强度S235JR钢，对高强度S690QL钢的使用及非比例加载效果进行了探索性研究。研究的重点是桥梁设计中常用的无荷载角焊缝，更普遍的是主梁和支柱之间的焊缝。实验程序包括33个单轴和多轴疲劳试验，部分是在一个新的多轴装置上进行的，该装置允许在典型的焊接细节中进行比例和非比例试验。然后在三维有限元模型的帮助下，将疲劳寿命与局部方法估计的结果进行比较。结果表明，采用一些著名的局部方法进行多轴疲劳寿命评估适用于多轴应力状态下的分析。将各模型和方法的精度与考虑所有先前引用参数的实验值进行了比较。
In this study, the multiaxial fatigue strength of full-scale transversal attachment is assessed and compared to original experimental results and others found in the literature. Mild strength S235JR steel is used and an exploratory investigation on the use of high strength S690QL steel and the effect of non-proportional loading is presented. The study focuses on non-load carrying fillet welds as commonly used in bridge design and more generally between main girders and struts. The experimental program includes 33 uniaxial and multiaxial fatigue tests and was partially carried out on a new multiaxial setup that allows proportional and non-proportional tests in a typical welded detail. The fatigue life is then compared with estimations obtained from local approaches with the help of 3D finite element models. The multiaxial fatigue life assessment with some of the well-known local approaches is shown to be suited to the analysis under multiaxial stress states. The accuracy of each models and approaches is compared to the experimental values considering all the previously cited parameters.