A structural stress-based critical plane method for multiaxial fatigue life estimation in welded joints
A structural stress-based critical plane method for multiaxial fatigue life estimation in welded joints
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DOI：
10.1111/ffe.12369
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发表时间：
2016-03
影响因子：
3.7
通讯作者：
C. Jiang;Liu Zhicheng;X. Wang;Zhan Zijie;X. Long
中科院分区：
文献类型：
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作者：
C. Jiang;Liu Zhicheng;X. Wang;Zhan Zijie;X. Long
本文的目的是提出一种新的疲劳寿命估算模型，更好地适应焊接接头受到多轴载荷。首先，定义了一个网格尺寸不敏感的结构应力，使适当地表征应力集中效应。其次，考虑多轴应力状态和加载路径的影响，在寿命预测模型中采用适当的临界平面方法，最初提出的Carpinteri和合作者。针对给定的焊接接头几何形状，在不同的载荷条件下进行了实验验证，包括单轴载荷、扭转载荷和多轴载荷。通过大量的疲劳试验数据验证了新方法的可靠性和有效性。
This paper aims at proposing a new fatigue life estimation model that is preferably adapted to welded joints subjected to multiaxial loading. First, a mesh-size insensitive structural stress is defined that enables to characterize the stress concentration effect appropriately. Second, the multiaxial stress state and loading path influence are taken into account in the lifetime prediction model by adopting a suitable critical plane method, originally proposed by Carpinteri and co-authors. Experimental verification is conducted for a given welded joint geometry under different loading conditions, including uniaxial, torsional and multiaxial loads. The reliability and effectiveness of the new method are validated through substantive fatigue testing data.