High-cycle fatigue behaviour of a timber-to-timber connection with self-tapping screws under lateral loading

High-cycle fatigue behaviour of a timber-to-timber connection with self-tapping screws under lateral loading
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使用自攻螺钉的木材与木材连接在横向载荷下的高周疲劳行为

DOI:
10.1007/s00107-021-01699-x
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发表时间:
2021
影响因子:
2.6
通讯作者:
Sieder
Sieder
中科院分区:
材料科学2区
文献类型:
--
作者:
Niebuhr;Sieder

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采用自攻螺钉的木材与木材连接的高周疲劳行为,通过紧固件在弯曲下由于其对准横向载荷方向进行了测试。循环试验采用正弦非反向加载(),加载频率为5 Hz。根据Johansen的理论(欧洲屈服模型),所检查的连接被设计为准静态破坏机制,每个剪切面有两个塑性铰,这反映在观察到的疲劳破坏中。基于在有限寿命状态下的4种名义应力水平上进行的30次循环试验,得到了各自的Wöhler-curve,由于考虑到单个试件的比密度,与试验数据显示出高度的一致性。结果表明,与轴向载荷相比,所测试的紧固件在弯曲下表现出优越的疲劳性能。提出了一种简单的安全边方法,用于将Wöhler-curves用于螺纹紧固件的轴向加载到紧固件弯曲的当前情况,扩展了轴向加载下行为的现有和未来研究结果的可能应用领域。
The high-cycle fatigue behaviour of a timber-to-timber connection with self-tapping screws is examined with the fasteners under bending due to their alignment lateral to the load direction. The cyclic tests were carried out with a sinusoidal non-reversed load () with a loading frequency of 5 Hz. The examined connection is designed for the quasistatic failure mechanism with two plastic hinges per shear plane according to Johansen’s theory (European Yield Model), which is mirrored in the observed fatigue failure. Based on 30 cyclic tests on four nominal stress levelsin the finite-life regime the respective Wöhler-curve is obtained, showing high conformity with the test data due to a consideration of the specific density of the individual specimens. It is shown that the examined fasteners show a superior fatigue behaviour under bending compared to axial loading. A simple safe-side approach for the application of Wöhler-curves for axial loading of threaded fasteners to the present case of fastener bending is proposed, extending the field of possible applications for the results of existing and future studies of the behaviour under axial loading.
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发表时间: 1991
期刊: Holz als Roh- und Werkstoff
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