A Study of Loosening and Fatigue of Bolted Joints under Transverse Vibration
A Study of Loosening and Fatigue of Bolted Joints under Transverse Vibration
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横向振动作用下螺栓接头松动与疲劳的研究
DOI：
10.4271/2005-01-1320
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
D. Socie
中科院分区：
文献类型：
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作者：
S. Hashimura;D. Socie
在小横向振动下进行了螺栓松动疲劳试验，以了解其在长寿命区域的行为。目前的研究集中在螺纹的松动疲劳机理和横向振动引起的螺纹根部名义应力的估算上。结果表明，如果螺栓在103~104次振动周期内松动，则不会出现第一螺纹根部裂纹形核等损伤，松动是由螺栓旋转引起的。然而，如果直到大约105∼106次循环才发生松动，则在所有实验中都可以在第一线的根部观察到裂纹。松动是由于裂纹的形核和扩展导致螺栓刚度的损失，进而导致螺栓旋转。结果还表明，高于阈值的初始夹紧力对螺栓连接的松动疲劳寿命没有显著影响。横向振动力的大小对松动疲劳寿命的影响最为显著。
Bolt loosening fatigue tests under small transverse vibrations have been performed to understand the behavior in the long life region. The current study is focused on the loosening-fatigue mechanism and on the estimation of nominal stress at the root of the first thread caused by transverse vibration. Results show that if a bolt has loosened within 10 3- 10 4 vibration cycles, damage such as crack nucleation at the root of the first thread is not observed, and loosening is due to bolt rotation. However, if loosening does not occur until approximately 10 5 ∼10 6 cycles, then a crack is observed at the root of the first thread in the all experiments. Loosening occurs due to loss of bolt stiffness caused by crack nucleation and propagation which then leads to bolt rotation. Results also show that the initial clamping force above a threshold level does not significantly influence the loosening-fatigue life of a bolted joint. The amplitude of the transverse vibration force is the most significant influence on the loosening-fatigue life.