Cold expansion of rail-end-bolt holes: Finite element predictions and experimental validation by DIC and strain gauges

Carrabs, Alessandro; Elliott, Adam; Meo, Michele

doi:10.1016/j.ijfatigue.2021.106275

Cited by 19 publications

(3 citation statements)

References 66 publications

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“…Railway rails are subjected to rolling contact fatigue, therefore, characterization of the resistance to crack initiation, crack growth and final fracture is highly relevant [5,6]. Concerning this, several methods and models have been developed to estimate the severity of the stress state at the tip of fatigue cracks, formulating finite element models, or weight function solutions [6][7][8][9][10][11][12]. It is well known that pearlitic steels are characterized by a brittle behavior under quasi-static loading conditions at room temperature [13].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the fatigue and fracture properties of a fine pearlitic rail steel

Leonetti,

Schotsman

2024

Frattura Ed Integrità Strutturale

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This study reports an experimental investigation of the fatigue and fracture resistance of R350HT, a heat-treated pearlitic rail steel with refined microstructure used in rails. Monotonic tensile, rotating bending, linear elastic plane strain fracture toughness, and fatigue crack growth rate tests are presented. The results are used to outline the basic properties and are corroborated by fractographic investigation. This enables the identification of the dominant type of fracture. Regarding fatigue and fracture resistance, the investigated material shows similar properties as other pearlitic rail steels, such as R260. At room temperature, the dominating fracture is of brittle cleavage type, showing some ductile regions associated with pro-eutectoid.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on the fatigue and fracture properties of a fine pearlitic rail steel

Leonetti,

Schotsman

2024

Frattura Ed Integrità Strutturale

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“…One of the most attractive features of DIC is its ability to measure strain under full-field conditions [ 30 , 31 ]. At present, scholars have used DIC to carry out research on CE-related issues [ 32 , 33 , 34 ]. However, the SSCE process of three holes has not been studied in depth, and the DIC method is rarely used to measure the residual strain at the hole edge of multi-hole samples during the SSCE process.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Split Sleeve Cold Expansion Process on Multiple Hole Aluminum Alloy

et al. 2023

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Multiple cold expansion holes are widely used in connection areas of aircraft structures, in order to achieve uniform load transfer of the skin or connection parts. Split sleeve cold expansion (SSCE) is widely used to enhance the fatigue life of fastener holes by applying compressive residual stresses around the holes. In this study, the finite element method (FEM) was used to research the distribution and variation of residual stresses along the hole edges of 7075AA single-hole and multi-hole cold expansion (CE) specimens. Full-field strain measurements of single-hole and multi-hole specimens were performed using two-dimensional digital image correlation (DIC), and the residual stress and strain at the hole edge of the specimens measured by FEM and DIC were compared. FEM results shows that the maximum circumferential and radial residual stresses of three-hole specimens with three-hole spacing are increased by 5.37% and 31.53% compared with single-hole specimens. The maximum circumferential residual stress of three-hole specimens with four-hole spacing increases by 7.25% compared with a single hole, but the radial residual stress decreases by 12.98%. In addition, for three-hole specimens with hole spacing three times the hole diameter, the strengthening effect of SSCE in the order of middle hole, then left hole, and, finally, right hole is better than that of SSCE in the order of left to right hole. FEM and DIC full-field strain results are basically consistent.

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“…[16][17][18] Many research studies have proved that CE process can enhance fatigue life for various materials and structures under external cyclic loading. For instance, fatigue life of several types of aluminum alloy structures such as open holes, 19,20 bolted holes, 21,22 double-lap bolted joints, [23][24][25] and bonded joints 26 can be extended by CE process. Holed structures made of other materials such as magnesium alloy, 27 titanium alloy, 28,29 steel, 30 and even composites 31 can also gain some life increments treated by CE method.…”

Section: Introductionmentioning

confidence: 99%

Residual stress distribution and fatigue performance investigations of electromagnetic force-based dynamic cold expansion open-holed sheet

Zheng

Cao

Zuo

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this study, residual stress distributions and fatigue performances of electromagnetic driving dynamic cold expansion (DCE) open-holed sheets were investigated. Fatigue behaviors were tested, and residual stress fields were obtained experimentally and numerically. Furthermore, a fatigue life prediction method based on three-dimensional stress distribution was proposed. Results showed that DCE method extended higher fatigue life and produced more uniform residual stress along hole axial direction than static cold expansion (SCE) method. The stress distribution differences led to different fatigue crack initiation and propagation modes of DCE and SCE specimens. Uniform stress distributions along axial direction in DCE specimens contributed to random initiations and horizontal propagations of fatigue cracks, while the fatigue cracks in SCE specimens usually initiated at the mandrel entrance layer and propagated to the mandrel exit layer. Moreover, the predicted fatigue life results agreed well with experimental data.

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Cold expansion of rail-end-bolt holes: Finite element predictions and experimental validation by DIC and strain gauges

Cited by 19 publications

References 66 publications

Experimental investigation on the fatigue and fracture properties of a fine pearlitic rail steel

Experimental investigation on the fatigue and fracture properties of a fine pearlitic rail steel

Finite Element Analysis of Split Sleeve Cold Expansion Process on Multiple Hole Aluminum Alloy

Residual stress distribution and fatigue performance investigations of electromagnetic force-based dynamic cold expansion open-holed sheet

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