Experimental Study and Life Prediction of Bolt Loosening Life under Variable Amplitude Vibration

Yang, Guangwu; Che, Chengjian; Xiao, Shoune; Yang, Bing; Zhu, Tao; Jiang, Shilin

doi:10.1155/2019/2036509

Cited by 16 publications

(8 citation statements)

References 19 publications

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“…Senthilkumar and Sendhilkumar [16] conducted experiments and found different frequency characteristics in the spectrum for different coupling types. Wang and Chen [17] carried out numerical modeling of the looseness machine to analyze the characteristics of asynchronous responses. Yang et al [18] conducted an experiment to determine the relationship between fatigue and bolt looseness.…”

Section: Literature Surveymentioning

confidence: 99%

Vibration Analysis of Steam Turbine Bearings

2022

JRSE

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The steam turbine is a rotating machine so it will continue to experience shaft shifts axially and radially which can cause vibrations. Therefore, we need a tool such as monitoring and proximity probe sensors so that vibrations in the turbine when operating can be monitored. One of the tools that can be used to detect the cause of damage to the steam turbine bearings at PT. Supreme Energy Muara Laboh (SEML) is a System One Bently Nevada application that is connected to a turbine bearing to read the spectrum and the waveform. The resulting spectrum and waveform are then analyzed according to the Mobius Institute Standard. Based on the results of the vibration analysis on the steam turbine PT. SEML shows that bearing 1 indicates unbalance, bearing wear and angular misalignment. Bearing 2 has unbalance, bearing wear, parallel misalignment and angular misalignment, bearing 3 indicates parallel misalignment, and bearing 4 indicates unbalance, parallel misalignment and angular misalignment.

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Section: Literature Surveymentioning

confidence: 99%

Vibration Analysis of Steam Turbine Bearings

2022

JRSE

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“…Bolted joints are widely used in the fields of mechanical engineering, aerospace, civil engineering and other fields due to the advantages of large connection force and convenient disassembly [1][2]. The reliability of bolted joints plays a vital role in the safety of the entire structure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Transverse Vibration Amplitude on the Loosening of Bolted Joint by Finite Element Simulation

Luo

Zhang

et al. 2022

J. Phys.: Conf. Ser.

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A detailed finite element (FE) model of M20 bolted joint is established. Using the FE model, the loosening processes of bolted joint under different transverse vibration amplitude are simulated. The results show that there exists a critical transverse vibration amplitude. When the transverse vibration amplitude is smaller than the critical transverse vibration amplitude, the bolted joint will not loosen. When it is larger than the critical transverse vibration amplitude, the bolted joint will loosen. The larger the transverse vibration amplitude is, the faster the bolted joint loosens. Based on clamping force, nut rotation angle, bolt torsion deformation and slip of thread contact surface, the mechanism of the influence of transverse vibration amplitude on the loosening of the bolted joint is analyzed.

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“…He then drew the bolt-loosening displacement-life (D-N) curve with reference to the stress-life (S-N) curve of the material and found that the D-N curve is similar to the S-N curve and also has the characteristics of double straight lines and high-and low-cycle boundaries. Yang et al [17] studied the mechanism of bolt-loosening accumulation by conducting bolt high-low and low-high transverse variable-amplitude vibration tests and established a linear accumulation model of bolt loosening similar to the material fatigue linear accumulation criterion. Based on the bolt-loosening D-N curve and the bolt looseness linear accumulation model, the bolt looseness life can be predicted.…”

Section: Introductionmentioning

confidence: 99%

Competitive Failure of Loosening and Fatigue of Bolts under Composite Excitation

Yang

Liu

Xiao

et al. 2021

Shock and Vibration

Self Cite

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At present, research on the loosening of bolts under transverse excitation and their fatigue under axial excitation has been relatively mature, but research on the competitive relationship and failure characteristics between loosening and fatigue of bolts under transverse and axial composite excitation is still insufficient. Therefore, a method to accurately determine the failure types of bolts is proposed in this study by conducting a competitive failure test of loosening and fatigue under composite excitation. According to this method, the failure types of bolts can be distinguished. The analysis results reveal that there is an obvious competitive failure relationship between the loosening and fatigue of bolts, and the failure mode is mainly affected by the ratio of the transverse and axial loads (ξ). There is a critical ξ of bolt-loosening or fatigue failure, and the critical ξ is an inherent property of the bolt and is unrelated to the load. The critical ξ of 8.8 grade M8 × 1.25 × 70 high-strength bolts under composite excitation is obtained as 0.075 mm/kN. The failure mode of bolts under composite excitation can be predicted based on the critical ξ.

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Experimental Study and Life Prediction of Bolt Loosening Life under Variable Amplitude Vibration

Cited by 16 publications

References 19 publications

Vibration Analysis of Steam Turbine Bearings

Vibration Analysis of Steam Turbine Bearings

Influence of Transverse Vibration Amplitude on the Loosening of Bolted Joint by Finite Element Simulation

Competitive Failure of Loosening and Fatigue of Bolts under Composite Excitation

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