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首页> 外文期刊>SAE International Journal of Materials and Manufacturing >Fatigue Evaluation of Notched Plate Specimens by the Battelle Structural Stress Method
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Fatigue Evaluation of Notched Plate Specimens by the Battelle Structural Stress Method

机译：用Battelle结构应力法对缺口试样的疲劳评估。

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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，证明了基于有限元的，网格不敏感的Battelle结构应力方法在具有不同试样类型和缺口形状的缺口试样（非焊接）的疲劳寿命预测中的适用性。使用Battelle结构应力疲劳评估程序分析了有据可查的缺口疲劳数据，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在一系列较早的出版物中得到了证明，适用于具有不同接头类型，板厚和加载方式的焊接结构。在此，针对具有缺口的结构，提出了适用于有限元建模和使用寿命模拟的类似Battelle结构应力程序。与焊接疲劳数据不同，与缺口相关的疲劳寿命的裂纹扩展部分并不总是占失效循环总数的主导。这取决于切口尖端的应力状态。同样，对于缺口疲劳数据，平均应力效应可以在S-N曲线中清楚看到。根据缺口应力的特点，提出了缺口板的结构应力计算程序。引入特征韧带尺寸以进行等效结构应力范围计算。已发现，无论缺口几何形状，缺口应力集中系数和平均应力如何，缺口试样的疲劳测试数据都可以有效地折叠到一条主S-N曲线上。所提出的程序可用于带缺口板的疲劳寿命预测。

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