High-Cycle Fatigue Behavior of a Self-tapping Timber Screw Under Axial Tensile Loading

High-Cycle Fatigue Behavior of a Self-tapping Timber Screw Under Axial Tensile Loading
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轴向拉伸载荷下自攻木螺钉的高周疲劳行为

DOI:
10.1007/s11668-020-00863-4
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发表时间:
2020
影响因子:
1.2
通讯作者:
Sieder
Sieder
中科院分区:
--
文献类型:
--
作者:
Niebuhr;Sieder

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在轴向拉伸载荷R= 0.1时,研究了自攻木材螺钉的高周疲劳行为。基于71个有限寿命和长寿命区域的疲劳试验,得到了螺纹区失效和头部撕裂的失效模式的Wöhler曲线。与现有类似测试结果的比较表明,在长寿状态下行为相同,在有限寿命状态下存在微小差异,这不能令人信服地完全归因于测试条件的变化或受检人群的差异。根据EN 1993-1-9,细节类别50的疲劳验证被发现是高度保守的,而细节类别100被高估了在有限寿命区域中观察到的疲劳行为。除了现有的关于自攻螺钉疲劳行为的观察外,还可以对螺钉的几何和程序差异的决定性进行第一次评估。
The high-cycle fatigue behavior of a self-tapping timber screw is examined for axial tensile loading withR= 0.1. Based on 71 fatigue tests in the finite-life and long-life regime, Wöhler curves are derived for the failure modesthread area failureandhead tear off. Comparisons with existing results of similar tests show equal behavior in the long-life regime and slight differences in the finite-life regime which cannot convincingly be attributed exclusively to either varying testing conditions or differences in the examined population. The fatigue verification according to EN 1993-1-9, detail category 50, is found to be highly conservative, whereas detail category 100 is shown to overestimate the observed fatigue behavior in the finite-life regime. Adding to existing observations on the fatigue behavior of a self-tapping screw, a first assessment of the decisiveness of geometrical and procedural differences in the screws can be made.
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