Fracture failure analysis and structure improvement on thread joint of turbine shaft

Liu, Yang; Lian, Zhanghua; Shaohu, Liu; Luo, Tong

doi:10.1016/j.engfailanal.2020.104625

Cited by 5 publications

(3 citation statements)

References 25 publications

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“…Based on the theoretical analysis and experimental research, scholars studied the load distribution characteristic on the fortification surface under different working conditions. [9][10][11][12] With the rapid development of computer technology, many numerical methods are proposed. Due to the low cost and convenience of implementation, scholars studied the dynamic mechanical response of underground fortification under blast load based on numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Influence of explosion distance on the dynamic mechanical response of underground fortification

Lin

Chen

Gan

et al. 2023

J. Phys.: Conf. Ser.

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Many key military targets have been moved underground to improve the battlefield survivability. To study the influence of explosion distance on the dynamic mechanical response of underground fortification, the full-time numerical simulation is conducted based on the CDEM numerical method. First, four numerical simulations corresponding to different explosion distances are conducted. Then, the displacement characteristic of underground fortification and rock mass is analyzed. Finally, the fracture characteristic of underground fortification and rock mass is analyzed. The numerical results show that the damage degree of underground fortification and rock mass weakens with the increase of explosion distance. When the distance increases from 5 m to 20 m, the volume of rock entering the underground fortification decreases from 24.78 m3 to 0 m3. The time-history curve of crack ratio has the four-stage characteristic, and it increases rapidly during the explosion initiation process. As the explosion distance increases, the top concrete wall mainly undergoes tensile fracture.

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Section: Introductionmentioning

confidence: 99%

Influence of explosion distance on the dynamic mechanical response of underground fortification

Lin

Chen

Gan

et al. 2023

J. Phys.: Conf. Ser.

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“…7 In the working process of starting motors, the stress of splines is affected by many factors. There are many reasons for the failure of splines, mainly including material defects, 8,9 heat treatment defects, [10][11][12][13] stress concentration during mechanical processing, 11,12 installation errors, 4,[13][14][15][16] and design errors. 16,17 In recent years, researchers have paid attention to the contact response of spline tooth surfaces.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of spline coupling in an engine starting motor

Zhao

Liu

Xie

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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A failure analysis of starting motor is performed using analytical method and finite element method. The influence of external load and material properties on the stress characteristics were discussed. For 45 steel internal spline, the maximum contact stress is greater than the allowable contact stress. This may cause internal splines failure. The bending stress and shear stress are less than the corresponding allowable stress. To be specific, when the maximum 130 N/m applied to the spline coupling in finite element analysis, the contact stress, bending stress, and shear stress are 260, 144, and 40 MPa, respectively. The corresponding allowable contact stress, allowable bending stress, and allowable shear stress are 197, 400, and 200 MPa, respectively. The stress value at the addendum and side of internal spline is maximum, which has good consistency with the failure position of experimental test. In fact, the calculation results obtained from analytical study may have the possibility of underestimating or overestimating the true stress state. This is mainly because analytical study has certain limitations. Therefore, it is necessary to use finite element method to analyze the stress state of the spline structure under design loads and determine whether its strength meets the design requirements.

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“…If a structure is free of defects or defects have occurred during operation, the defects shall not reach the critical values to ensure safe operation of the structure. Evaluation of the degree of defects in threaded joints is a complex process that requires both theoretical and experimental investigation after the identification of the defect or crack [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Durability of Threaded Joints

et al. 2021

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The article deals with the determination of the resistance to cyclic loading of the threaded joints of pressure vessels and defective elements according to the failure mechanics criteria. Theoretical and experimental studies do not provide a sufficient basis for the existing calculation methods for the cyclic strength of the threaded joints of pressure vessels. The short crack kinetics in the threaded joints, a shakedown in one of the joint elements of pressure vessels, i.e., in the bolt or stud, has not been studied sufficiently. The calculation methods designed and improved within the study were based on theoretical and experimental investigations and were simplified for convenient application to engineering practice. The findings could be used to investigate the shakedown of studs of a different cross-section with an initiating and propagating crack. Value: the developed model for the assessment of durability of the threaded joints covers the patterns of resistance to cyclic failure (limit states: crack initiation, propagation, final failure) and shakedown (limit states: progressive shape change and plastic failure). Analysis-based solutions of plastic failure conditions and progressive shape change were accurate (the result was reached using a two-sided approach; the solutions were obtained in view of the parameters of the cyclic failure process in the stud (bolt) and based on experimental investigations of the threaded joints).

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Fracture failure analysis and structure improvement on thread joint of turbine shaft

Cited by 5 publications

References 25 publications

Influence of explosion distance on the dynamic mechanical response of underground fortification

Influence of explosion distance on the dynamic mechanical response of underground fortification

Failure analysis of spline coupling in an engine starting motor

Assessment of the Durability of Threaded Joints

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