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Fatigue Evaluation of Notched Plate Specimens by the Battelle Structural Stress Method

机译：战役结构应力法对缺口板标本的疲劳评价

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摘要

In this paper, the applicability of the finite element-based, mesh insensitive Battelle structural stress method is demonstrated for fatigue life predictions of notched specimens (non-welded) with different specimen types, and notch shapes. Well-documented notch fatigue data were analyzed using the Battelle structural stress fatigue evaluation procedure, including notched plate fatigue data for steel and aluminum alloys. The effectiveness of the Battelle structural stress procedure has been demonstrated in a series of earlier publications for welded structures with different joint types, plate thicknesses, and loading modes. Here, a similar Battelle structural stress procedure suitable for finite element modeling and service life simulations is proposed for structures with notches. Unlike weld fatigue data, the crack propagation portion of the fatigue life associated with a notch does not always dominant the total number of cycles to failure. It depends on the stress state at the notch tip. Also, mean stress effects can be seen clearly in S-N curves for notched fatigue data. Based on the characteristics of the notch stress, a structural stress calculation procedure for notched plates is proposed. A characteristic ligament size is introduced for the equivalent structural stress range calculation. It is found that fatigue test data for notched specimens can be effectively collapsed onto a single master S-N curve regardless of notch geometry, notch stress concentration factor, and mean stress. The proposed procedure can be utilized for fatigue life predictions of notched plates.
机译：在本文中，对基于有限元的网眼短短敏感堡垒结构应力法的适用性证明了具有不同样品类型的缺口标本（非焊接）的疲劳寿命预测，以及缺口形状。使用Battelle结构应力疲劳评估程序分析了记录良好的Notch疲劳数据，包括钢和铝合金的缺口板疲劳数据。 Battelle结构应力程序的有效性已经在一系列早期的出版物中证明了具有不同关节类型，板厚度和装载模式的焊接结构。这里，提出了一种适用于有限元建模和使用寿命模拟的类似的Battelle结构应力过程，用于具有缺口的结构。与焊接疲劳数据不同，与凹口相关的疲劳寿命的裂纹传播部分并不总是占据失败的总循环总数。它取决于凹口尖端的应力状态。此外，可以清楚地在S-N曲线中看到平均应力效应，用于缺口疲劳数据。基于凹口应力的特点，提出了一种用于切口板的结构应力计算过程。引入特征韧带尺寸，用于等效结构应力范围计算。结果发现，无论缺口几何，切口应力集中因子和平均应力如何，都可以有效地折叠到单个主S-N曲线上的疲劳试验数据。所提出的程序可用于疲劳寿命预测的缺口板。

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