Fatigue life estimation of screws under multiaxial loading using a local approach

Sorg, Andreas; Utzinger, Johannes; Seufert, Bruno; Oechsner, Matthias

doi:10.1016/j.ijfatigue.2017.06.034

Cited by 11 publications

(6 citation statements)

References 11 publications

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“…The test of the fretting fatigue failure at the middle of the contact surface is achieved only in it. In paper [3], Schneider's method is enhanced to generate an efficient procedure for calculating the fatigue-induced damage at the screws. The failure criterion is the technical relevant incipient crack length in the first load-bearing thread turn of the screw [3].…”

Section: Literature Reviewmentioning

confidence: 99%

“…In paper [3], Schneider's method is enhanced to generate an efficient procedure for calculating the fatigue-induced damage at the screws. The failure criterion is the technical relevant incipient crack length in the first load-bearing thread turn of the screw [3]. Using the oil-based fluids in drilling, from the point of view of the fatigue strength of the tool-joints, is preferred [4].…”

Section: Literature Reviewmentioning

confidence: 99%

“…The paper [5] shows the influence of the process parameters on the quality of thread connections, notably, thread formation axial force on the opposite sides of the roots. The articles [3][4][5][6][7][8] do not demonstrate research of the screwing make-up process.…”

Section: Literature Reviewmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Working Height of a Thread Profile on Quality Indicators of the Drill-String Tool-Joint

Kopei

Onysko

Panchuk

et al. 2021

Lecture Notes in Mechanical Engineering

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Drilling oil and gas wells is always accompanied by the process of screwing and unscrewing the drill-pipe connector. Its effectiveness largely depends on the accuracy and quality of the thread profile, including the profile height's accuracy. Studies show a decrease in the contact pressures and stresses between the threaded surfaces of the box and the pin of the drill string tool-joint as the working height of the profile increases. It is a positive factor influencing the durability and reliability of the drill pipe connector. On the other hand, the same increase of the working height leads to the improvement of the screwing process itself, which is an integral part of lowering and lifting operations during the operation of drill strings. The increased contact area allows the joint to handle high make-up torques without damaging the thread profile. It is also advisable to consider the design of the roots not of around but of an elliptical profile. To ensure leak-tightness and fatigue strength, the operation of joints with a reduced value of h should be avoided.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Working Height of a Thread Profile on Quality Indicators of the Drill-String Tool-Joint

Kopei

Onysko

Panchuk

et al. 2021

Lecture Notes in Mechanical Engineering

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“…However, various discontinuous events that are mostly caused by manoeuvres and special service conditions must be respected, too. This problem significantly complicates a simulation procedure, and new non-standard methods and algorithms must be applied [3]. It is also very important to have a reliable algorithm of counting of closed hysteresis loops.…”

Section: Crosscorrelated Processesmentioning

confidence: 99%

Fatigue life prediction of mechanical structures under stochastic loading

Leitner

Figuli

2018

MATEC Web Conf.

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Abstract. Problems of fatigue life prediction of materials and structures are discussed in the paper. Service loading is assumed as a continuous loading process with possible discontinuous events, which are caused by various operating conditions. The damage in a material is due to a cumulative degradation process. The damaging process is then represented either by rain-flow matrices or by a fatigue damage function which is derived using some hypothesis of a fatigue failure criterion. Presented theoretical procedure enables a very effective estimation of a service life and/or reliable evaluation of residual life of any structures under various types of loading and environmental conditions. This approach creates a good basis for powerful expert systems in structural and mechanical engineering. The aim of the paper is to present briefly some results of analysis of load-bearing steel structure loads of special railway crane PKP 25/20i which was utilized in some specific ad relatively hard operating conditions. Virtual models of the structure were being used in an analysis of acting working dynamics loads influence to be able to forecast fatigue life of load-bearing of the crane jib.

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“…At present, research on joint threads mainly focuses on oil drill strings [6][7][8], which have a large wall thickness and a large thread design margin; hence, these structures cannot provide a direct reference for the core drilling thread design [9][10][11]. Wireline core drill strings are thin-walled structures that can be used as a reference for the thread design of core drilling tools.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization for the Thin-Walled Joint Thread of a Coring Tool Used for Deep Boreholes

et al. 2020

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Threaded joints are key components of core drilling tools. Currently, core drilling tools generally adopt the thread structure designed by the API Spec 7-1 standard. However, fractures easily occur in this thread structure due to high stress concentrations, resulting in downhole accidents. In this paper, according to the needs of large-diameter core drilling, a core barrel joint was designed with an outer diameter of Φ135 mm and a trapezoidal thread profile. Subsequently, a three-dimensional simulation model of the joint was established. The influence of the external load, connection state and thread structure on the stress distribution in the joint was analyzed through simulations, from which the optimal thread structure was determined. Finally, a connection test was carried out on the threaded joint. The stress distribution in the joint thread was indirectly studied by analyzing gas leaks (i.e., the sealing effect) under axial tension. According to the test data and the simulation results, the final joint thread structure was optimized, which lays a good foundation for the design of a core barrel.

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Fatigue life estimation of screws under multiaxial loading using a local approach

Cited by 11 publications

References 11 publications

Influence of Working Height of a Thread Profile on Quality Indicators of the Drill-String Tool-Joint

Influence of Working Height of a Thread Profile on Quality Indicators of the Drill-String Tool-Joint

Fatigue life prediction of mechanical structures under stochastic loading

Design Optimization for the Thin-Walled Joint Thread of a Coring Tool Used for Deep Boreholes

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