Fracture failure analysis and research on thread joint of drive shaft shell of positive displacement motor

Liu, Yang; Lian, Zhanghua; Zou, Jiayan; Deng, Cangsong; He, Ying

doi:10.1016/j.engfailanal.2020.104805

Cited by 13 publications

(5 citation statements)

References 25 publications

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“…Subsequently, the drive axle assembly was subjected to simulations such as 1G load drive axle assembly side slip, 4G load drive axle assembly vertical bending, 4G load drive axle assembly vertical bending under overload conditions, drive axle assembly side slip under overload conditions, side slip simulation after 4G impact under overload conditions, and ultimate side slip simulation under overload conditions. These simulations aimed to scrutinize the plastic deformation and stress distribution of the drive axle casing as well as the drive shaft [48].…”

Section: Cae Evaluationmentioning

confidence: 99%

Failure Mechanism of Rear Drive Shaft in a Modified Pickup Truck

Huang,

Wang,

et al. 2024

Metals

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This paper investigates the failure mechanism of the rear drive shaft in a modified pickup truck which had operated for about 3000 km. The investigation included macroscopic and microscopic evaluation to document the morphologies of the fracture surface, measurement of the material composition, metallographic preparation and examination, mechanical testing, and finite element modelling and calculations. The results obtained suggest that rotation-bending fatigue was the primary cause of the drive shaft failure. The crack initiation is located in the root of the machined threads on the drive shaft surface and expanded along the side of the machining line surface. The main cause of fatigue cracks is attributable to a high stress concentration owing to a large unilateral bending impact under overload. Meanwhile, the bidirectional torsional force also produces a higher stress concentration and thus accelerates the fatigue crack to expand radially along the surface. Furthermore, the hardness of the central section of the drive shaft was marginally below standard. This deficiency results in harm to the bearings and other mechanical components, as well as expediting the enlargement of cracks. Finite element analysis revealed significant contact stress between the bearing and drive shaft, with stress levels exceeding the fatigue limit stress of the parent material. This highlights the need for reevaluation of the heat treatment process and vehicle loading quality to enhance the drive shaft’s longevity.

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Section: Cae Evaluationmentioning

confidence: 99%

Failure Mechanism of Rear Drive Shaft in a Modified Pickup Truck

Huang,

Wang,

et al. 2024

Metals

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“…Yang Chao et al [9][10][11] In order to further clarify the influence of cementing quality on the force deformation of the completion casing during the large-scale fracturing process of the deep gastight reservoir in Daqing. Wang Y et al [12][13][14][15][16][17]. A thermo-mechanical coupling model and analysis method for analyzing the mechanical response of casing cement ring formation was established.…”

Section: Introductionmentioning

confidence: 99%

Research on the influence of heat release from cement hydration on the mechanical properties of casing

Li,

Tian,

Shen

et al. 2024

J. Phys.: Conf. Ser.

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In order to study the influence of cement hydration heat release on the mechanical properties of casing, this paper calculates the wellbore temperature and pressure field based on the mathematical model of steady-state heat conduction of casing-cement ring-formation rock, establishes a mathematical model for the mechanical evaluation of cement hydration heat release and casing interaction, and performs finite element calculation and experimental simulation of the effect of cement hydration heat release on casing loss, and the results show that the results show: Along the axial direction of the wellbore, the maximum stress on the entire cement ring occurs in the lower position of the cement ring, and the maximum deformation on the casing occurs in the middle position. The axial stress variation range of the middle part of the casing is 50MPa, and the strain is 0.12%; The axial stress variation range of the outer ring is 235MPa, and the strain is 0.09%; The circumferential stress of the middle part varies from 500MPa to 0.255%. It is found that the stress and strain in the middle part of cement sheath are large, and yield is prone to occur. Under the action of cement hydration heat release, the long-axis elliptical deformation of (7.15∼31.8) mm occurs in the casing, that is, a large ovality is produced, which weakens the collapse strength of the casing. Two repeated tests showed that under the cement hydration heat release condition at the casing loss position, the temperature change of 60°C caused the increase of axial force of casing column and the increase of annular air pressure, which caused the non-uniform deformation of casing under the composite load of external extrusion and compression axial force.

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“…Zexin et al [5,6] considered the effects of material properties, thread lead angle, and nonlinear contact on the casing joint and used a finite element model to analyze the internal stress distribution of the coupling under the bending moment load, elucidating the fatigue damage evolution process of the casing joint. Yosuke et al [7][8][9] studied the thread bearing capacity through torque Processes 2024, 12, 1253 2 of 18 testing and the finite element method, and the maximum stress on the external thread approached the material yield limit. In the torque test, when the torque reached the upper limit, the torque of the threaded connection exceeded the standard torque value, resulting in excessive preloading of the threaded connection.…”

Section: Introductionmentioning

confidence: 99%

Research on Thread Seal Failure Mechanism of Casing Hanger in Shale Gas Wells and Prevention Measures

Mou,

Xie,

Wei

et al. 2024

Processes

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The strength and sealing failure of the connecting thread of the casing head mandrel hanger causes huge economic losses. One of the major challenges is the thread seal failure mechanism of the casing hanger in the wellhead during pressure testing in shale gas wells. In order to analyze the failure causes of connecting threads and put forward improvement measures, a typical case of a well accompanied by a hanger seal failure is analyzed in this paper, and a series of material tests are carried out. The microstructure and mechanical properties of casing materials and hanger materials could meet the field requirements. It is concluded that both the hanger material and casing material are characterized with significant ductile fracture. A three-dimensional model of the hanger and casing system is established, and the mechanical behavior is calculated for the connecting thread under different working conditions. The results showed that the connection degree of the hanger–casing is insufficient at the torque recommended by the manufacturer because of the difference in wall thickness between the box thread of the hanger and the box thread of the joint according to the connection degree of the coupling casing. It is seen that the high contact pressure ring of zone three on the sealing surface plays an effective sealing role under the manufacturer’s recommended torque (20,465 N·m). Finally, when the torque is increased by 25%, the maximum contact pressure between the pin thread of the casing and the box thread of the hanger can fully meet the internal pressure from the wellbore pressure test and the internal pressure strength required for subsequent operations.

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Fracture failure analysis and research on thread joint of drive shaft shell of positive displacement motor

Cited by 13 publications

References 25 publications

Failure Mechanism of Rear Drive Shaft in a Modified Pickup Truck

Failure Mechanism of Rear Drive Shaft in a Modified Pickup Truck

Research on the influence of heat release from cement hydration on the mechanical properties of casing

Research on Thread Seal Failure Mechanism of Casing Hanger in Shale Gas Wells and Prevention Measures

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