The retardation effect of combined application of stop-hole and overload on sheet steel

Lu, Yun-chao; Yang, Fangzhou; Chen, Te; Gong, Hao

doi:10.1016/j.ijfatigue.2019.105414

Cited by 9 publications

(8 citation statements)

References 41 publications

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“…Figure 12 shows a close agreement between the experimental results and the model proposed in Section 3.1. despite the significant crack growth observed at 𝑎 = 11 mm due to the drilled hole. The figure illustrates a retardation in the crack growth after the repair, leading to an overall increase in the residual fatigue life of the tested specimens [4,5]. For further comparison, Table 2 presents various estimations of fatigue life increments for steels.…”

Section: Fcg For the Expanded Sh Techniquementioning

confidence: 99%

“…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%

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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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Section: Fcg For the Expanded Sh Techniquementioning

confidence: 99%

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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“…The crack arrest behaviour of the stop-holes can be improved through optimizing the hole shape [ 21 ] and the arrangement, and by adjusting from the flank hole in front of the crack tip [ 22 ] to symmetric crack flank holes along the crack flanks [ 23 ] with different hole position. For example, Lu et al [ 24 ] studied the fatigue crack growth behaviour with the pure stop-hole effect and the combination of stop-hole and overload. It was found that the stop-hole diameter had a positive influence on the fatigue life, and the stop-hole location had a negative influence on fatigue life since the relatively extended fatigue life decreases linearly as the ratio of the stop-hole location to the width of the specimen increases.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Fracture Behaviour for Cracked Joints in Corrugated Plate Girders Repaired by Stop-Holes

Wang

Zhou²,

Wang

et al. 2023

Materials

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The efficient crack eliminated stop-hole measure was proposed to repair and reduce the stress concentration associated fracture risk of the corrugated plate girders by setting it at the critical joint of flange plate with tightened bolts and gaskets under preloading. To investigate the fracture behaviour of these repaired girders, parametric finite element analysis was conducted, focusing on the mechanical feature and stress intensity factor of crack stop-hole in this paper. The numerical model was verified against experimental results first, and then the stress characteristics due to the presence of crack open-hole were analysed. It was found that the moderate-sized open-hole was more effective than the over-sized open-hole in the reduction of stress concentration. For the model with prestressed crack stop-hole through bolt preloading, the stress concentration was nearly 50% with the prestress around open-hole increased to 46 MPa, but such a reduction is inconspicuous for even higher prestress. Relatively high circumferential stress gradients and the crack open angle of oversized crack stop-holes were decreased owing to additional prestress effects from the gasket. Finally, the shift from the original tensile area around the edge of the crack open-hole that was prone to fatigue cracking to a compression-oriented area is beneficial for the reduction of stress intensity factor of the prestressed crack stop-holes. It was also demonstrated that the enlargement of crack open-hole has limited influence on the reduction of stress intensity factor and crack propagation. In contrast, higher bolt prestress was more beneficial in consistently reducing the stress intensity factor of the model with the crack open-hole, even containing long crack.

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“…Therefore, crack arrest technology in crack propagation stage is widely used. For example overload technique [28][29][30], cold expansion [31][32][33][34], indentation (dimple) [35][36][37] and stop hole [30,35,[38][39][40][41][42]. A single overload causes crack closure, tip dullness and strain hardening near the tip.…”

Section: Introductionmentioning

confidence: 99%

“…The effects of deflecting hole on the crack direction and residual life were studied by Hu et al [42] through Extended Finite Element Method (XFEM). The comprehensive effect of stop hole and overload technology is studied by Lu [30] experimentally. Most of the above studies on stop holes are under either pure mode-I or pure mode-II.…”

Section: Introductionmentioning

confidence: 99%

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

Deng

Yin

Wang

et al. 2022

International Journal of Fatigue

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Fretting fatigue is a common structural failure phenomenon. It can greatly reduce the fatigue life of a structure, and because of the complexity of its load condition, it is a challenging research topic. This paper applies, for the first time, the widely used stop hole repair technology to a fretting fatigue specimen in crack propagation stage in order to extend its lifetime. LEFM approach is adopted for the crack propagation phase using Paris' law to predict the fatigue life. The critical plane parameter and variable length critical distance method are used together to predict the second crack initiation lifetime. This prediction method is validated by the central crack tensile fatigue experiment, which considers the stop hole. It is shown that the stop hole changes the propagation path and leads to a secondary crack initiation from the lower edge of hole. The increase of crack propagation life mainly comes from the secondary crack initiation. It is also found that the larger the radius of the stop hole, the greater the fatigue life is.

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The retardation effect of combined application of stop-hole and overload on sheet steel

Cited by 9 publications

References 41 publications

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

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

Numerical Analysis of Fracture Behaviour for Cracked Joints in Corrugated Plate Girders Repaired by Stop-Holes

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

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