Research on Numerical Calculation Method of Critical Load for Bolt Loosening under Transverse Loading

doi:10.3901/JME.2018.05.173

Abstract

Abstract: In order to evaluate the anti-loosening ability of bolt and guide the selection of the bolt in use, a numerical formula of critical load for bolt loosening is obtained through the force analysis in different circumferential positions of thread. Inhibiting localized thread slip is the condition of avoiding loosening in the formula derivation. The critical loads of the M5 bolts under 2 000 N and 2 500 N preloads are tested by the transverse vibration device and calculated by the numerical formula, respectively. The results show that the critical loads obtained by test and calculation are 302.5 N and 280.3 N for the bolt with 2 000 N preload, 372.5 N and 350.4 N for the bolt with 2 500 N preload. The relative errors between the test and calculation results are 7.3% (2 000 N) and 5.9% (2 500 N) respectively, confirming the accuracy and reliability of the numerical formula. Then, the effect of the structure parameters of bolt on the critical load for bolt loosening is analyzed based on the numerical formula. The results show that increasing the clamping load, the thread friction coefficient, the bolt diameter, the thread angle, and decreasing the clamping length, the lead angle, can contribute to increasing this critical load, and improve the anti-loosening ability of bolt.

Key words: bolt, critical load, localized slip, loosening, numerical calculation

CLC Number:

TH122

ZHANG Mingyuan, LU Liantao, TANG Mingming, ZENG Dongfang. Research on Numerical Calculation Method of Critical Load for Bolt Loosening under Transverse Loading[J]. Journal of Mechanical Engineering, 2018, 54(5): 173-178.

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