Effect of Transverse Load and Preload on the Fracture Life of Bolts

doi:10.12068/j.issn.1005-3026.2024.01.009

Abstract

Abstract:

Bolted joints are widely used in various industries for their simplicity and reliability， but the fatigue fracture of bolts is still a very prominent problem. Therefore， to accurately predict the bolt fracture failure life， the fatigue crack propagation experiments of bolt materials are conducted to obtain the fracture parameters of bolt materials， so that the Paris model can be established. Then the finite element method is applied with fatigue crack propagation experiments for calibration and achieves better results， which provides a basis for the calculation of the bolt fracture failure life. Finally， considering the influence of bolt pretension and transverse load on bolt fractures， a cracked bolt finite element model is established and the bolt failure life is quantitatively analyzed by the finite element method. The results show that the transverse load and bolt preload have a large effect on the stress intensity factor and bolt life.

Key words: bolt fracture, failure life, finite element calculation, transverse load, quantitative analysis

CLC Number:

TG 519.1

Xing-lin MIAO, Xian-zhen HUANG, Peng-fei DING, Zhi-qun ZHENG. Effect of Transverse Load and Preload on the Fracture Life of Bolts[J]. Journal of Northeastern University(Natural Science), 2024, 45(1): 68-75.

Figures/Tables 14

Fig. 1 Fatigue crack propagation experiment testing system

Fig. 2 Sample size drawing（unit：mm）

Fig. 3 Experimental results of fatigue crack growth of 25CrNiMo material

Fig. 4 Calculation process

Fig. 5 Comparison of experimental and simulation results

Fig. 6 Bolt calculation model

Fig. 7 Stress calculation results of bolt

Fig. 8 Effect of total load on type I stress intensity factor

Fig. 9 Effect of different preload forces on type I stress intensity factor

Fig. 10 Effect of different preload forces on type III stress intensity factor

Fig. 11 Effect of different preload forces on fatigue life

Fig. 12 Effect of different transverse loads on type I stress intensity factor

Fig. 13 Effect of different transverse loads on type I stress intensity factor

Fig. 14 Effect of different transverse loads on fatigue life

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