Numerical analysis of crack propagation in fretting fatigue specimen repaired by stop hole method

Deng, Qingming; Yin, Xiaochun; Wang, Dagang; Wahab, Magd Abdel

doi:10.1016/j.ijfatigue.2021.106640

Cited by 18 publications

(5 citation statements)

References 53 publications

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“…In order to study the influence of crack stop holes on the failure behavior of granite samples, for some samples with pre-crack inclination angle equal to 45 °, a crack stop hole was drilled near each end of the pre-crack for comparative analysis. The function of the crack stop hole is to prevent further propagation of cracks in areas where stress is easily concentrated (Deng et al, 2022). Nevertheless, the role of crack stop hole in this study is to change the crack growth path, therefore, it is arranged near the route of wing crack propagation, as shown in Figure 1.…”

Section: Test Sample and Equipmentmentioning

confidence: 96%

Failure characteristics and the law of the energy evolution of granite with different pre-crack inclination angles under uniaxial compression loading

Zhao

Zhang

et al. 2023

Front. Earth Sci.

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Cracks affect the strength of rock masses and eventually threaten their stability in engineering. In order to study the fracture characteristics and mechanical properties of cracked rocks, uniaxial compression tests of pre-cracked granite samples with a central circular through hole were carried out by using MTS816 rock mechanics testing system. The inclination angles of different pre-cracks are 0°, 15°, 30°, 45°, 60°, 75°, and 90° respectively, and the influence of the crack stop hole near the crack tip on the failure behavior of pre-cracked samples is also considered. The results indicate that, compared with the intact sample, the peak strength of pre-cracked samples decreases significantly and is related to the pre-crack inclination angle. The failure mode of the sample varies with the pre-crack inclination angle, and the crack stop hole near the crack tip also has a certain influence on the crack growth to a certain extent. However, in terms of failure mode and its transformation law, the influence of central circular through hole and crack stop hole can be ignored. Generally speaking, the larger the inclination angle of the pre-crack, the more the total energy required for failure of the sample, and the more the stored elastic strain energy. Before the peak strength, the elastic strain energy of the sample is greater than the dissipated energy, after the peak strength, the dissipated energy gradually exceeds the elastic strain energy due to energy conversion. It is found that the pre-crack reduces the energy storage capacity of the sample, and the total energy is ultimately dominated by sample integrity. The dissipated energy rate increases first, then decreases, and finally increases again, the inflection points are the end of micro-crack closure and the peak strength, respectively. The crack stop hole changes the law of energy evolution to a certain extent, which can improve the ability of rocks to accumulate energy when designed at an appropriate position, so as to improve its load-bearing capacity in a certain range. The results display the mechanical properties of pre-cracked granite samples under uniaxial compression and are conducive to its application in engineering.

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Section: Test Sample and Equipmentmentioning

confidence: 96%

Failure characteristics and the law of the energy evolution of granite with different pre-crack inclination angles under uniaxial compression loading

Zhao

Zhang

et al. 2023

Front. Earth Sci.

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“…Vantadori and Zanichelli [16] used the shot peening treatment on the contact surface in order to improve the life of fretting fatigue-affected components. In the same context, the crack growth path in the fretting fatigue specimen repaired by the stop hole method has been carried out by Deng et al [17]. They have shown a significant impact on the fretting fatigue crack propagation lifetime.…”

Section: Introductionmentioning

confidence: 97%

Numerical Analysis of Geometrical Parameters Effect on Contact Zone Under Fretting Fatigue Loading

Chaouch

Baltach

Benhamena

2022

Advances in Materials Science

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The fatigue process under fretting conditions is characterized by small oscillatory movements due to vibrating or cyclic loads between two surfaces in contact. Two phenomena can arise as a consequence: the surface wear of the bodies in contact, giving rise to the so-called fretting wear. The second phenomenon concerns crack nucleation in the contact region, causing a reduction in the fatigue strength of the component subjected to cyclic loading. This process is called “fretting fatigue”. In the present study, finite element models (2D-FEM) are provided to demonstrate the effect of pad radius on the contact parameters such as: contact pressure, shear traction, stresses, sliding, size of contact line and crack nucleation and its location along the contact line of aeronautical Al2024 alloy under fretting fatigue loading. Six numerical models are utilized to describe the effect of changing pad radii on contact stresses and damage of crack nucleation. The Ruiz parameter criterion should be used to predict the location of crack initiation in the contact zone. Comparison of the finite element results shows that there is a good agreement between the numerical modeling predictions with those analytical results. The stress field, relative slip, and damage parameters in fretting fatigue loading were highlighted. The pad radius substantially affects the distribution of contact parameters. Particular attention must be taken into consideration to this variable when analyzing the structure in fretting fatigue.

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“…Since in practice many components cannot be replaced as soon as the cracks are discovered, repair procedures are widely used to extend their residual lives, either by retarding the growth of fatigue cracks, or else by returning the fatigue process to the crack initiation phase. Many crack repair techniques are available, and some of them are relatively simple to implement, such as bonded composite patches [1][2][3], stop-holes (SH) [4][5][6][7][8][9][10][11], and grinding hammer peening [12][13][14]. However, other repair techniques are not so simple, like pulsed electron beam irradiation, metal crack stitching, vee-and-weld, and laser additive crack cladding [15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Estimation Model of Repaired Components with the Expanded Stop-Hole Technique

Velilla-Díaz,

Pinzón,

Guillén-Rujano

et al. 2024

Metals

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Fatigue crack growth tests are conducted to assess the efficacy of the stop-hole crack repair method. This straightforward and widely adopted technique involves drilling a hole at the crack tip and subsequently enlarging it using a pin inserted into the hole. A fracture mechanics-based model is proposed to estimate the extension of fatigue life achieved through the implementation of the stop-hole technique. The model’s predictions are validated using data obtained from fatigue crack growth tests conducted on both unrepaired and repaired M(T) specimens, following the guidelines outlined in the ASTM E647 standard. The error of the fracture mechanics-based model was 1.4% in comparison with the fatigue tests.

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Numerical analysis of crack propagation in fretting fatigue specimen repaired by stop hole method

Cited by 18 publications

References 53 publications

Failure characteristics and the law of the energy evolution of granite with different pre-crack inclination angles under uniaxial compression loading

Failure characteristics and the law of the energy evolution of granite with different pre-crack inclination angles under uniaxial compression loading

Numerical Analysis of Geometrical Parameters Effect on Contact Zone Under Fretting Fatigue Loading

Fatigue Life Estimation Model of Repaired Components with the Expanded Stop-Hole Technique

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