The effect of hole shape on the extent of fatigue life improvement by cold expansions

Rana, Muhammed Sohel; Makabe, Chobin; Fujiwara, Genkichi

doi:10.1016/j.engfailanal.2009.02.001

Cited by 29 publications

(9 citation statements)

References 20 publications

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“…The main results obtained are as follow: (1) In the present experimental conditions, the higher the load applied to the indentation, the longer the fatigue life was obtained. (2) The crack growth behavior was improved in the vicinity of the indentation region or area. 3The hardness distribution and residual stress distribution caused an improvement in the behavior of crack growth.…”

Section: Discussionmentioning

confidence: 99%

“…It is a common issue for fatigue cracks emanating from notches during overloading operations to be a concern for designer. Several mechanical processes for enhancement of the fatigue life are performed [1][2][3][4]. For example, a method commonly promoted in the aeronautical industry is to drill a stop hole and apply cold working to notches or holes [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Several mechanical processes for enhancement of the fatigue life are performed [1][2][3][4]. For example, a method commonly promoted in the aeronautical industry is to drill a stop hole and apply cold working to notches or holes [1,2]. Reducing stress concentration at the crack tip and the Improvement of Fatigue Life by Indentation and Hole Expansion 337 development of compressive residual stress on the crack growth path are causes for the improvement of fatigue life.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Fatigue Life of a Holed Specimen of Aluminum-Alloy 2024-T3 by Indentation and Hole Expansion

Ferdous

Makabe

Miyazaki

et al. 2012

Int. J. Mod. Phys. Conf. Ser.

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A method of improving the fatigue life and crack growth behavior of a center holed specimen was investigated. Local plastic deformation was applied around the hole by indentation to achieve the purpose. A series of fatigue tests was conducted on aluminum-alloy 2024-T3. Push-pull tests were performed under a stress ratio of R= -1 and a frequency of 10Hz. The observations of the crack initiation and growth were performed with a microscope, and hardness around the hole was measured by Vickers hardness testing machine. In the present study, the longest fatigue life was observed in the case of an indentation specimen with the highest load. The indentation was performed on both sides of the hole edges. The crack growth rate was decreased by indentation or expansion of the material around the hole. From the experimental results, it is found that the fatigue life and crack growth behavior of a holed or notched specimen can be improved by a simple technical method that is related to the local plastic working.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improvement of Fatigue Life of a Holed Specimen of Aluminum-Alloy 2024-T3 by Indentation and Hole Expansion

Ferdous

Makabe

Miyazaki

et al. 2012

Int. J. Mod. Phys. Conf. Ser.

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“…More then, a geometrical solution for the hole or the mandrel were proposed. For example, Jang and coworkers [30] proposed to apply a chamfer into the hole and Rana, Makabe and Fujiwara [31] used a quasi elliptical shaped pin mandrel to optimize residual stresses around the hole edge. The present work proposes to optimize the residual stress profile resulting by a cold expansion technique.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis and Optimization of the Residual Stresses Distribution Induced by Cold Expansion Technique

Baltach

Djebli

Bendouba

et al. 2018

Frattura Ed Integrità Strutturale

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This paper presents a numerical investigation about the influence of mandrel shape on residual stresses induced by the cold expansion procedure. Thus, ball and tapered pin are used for cold expanding the plate. As, the entrance face presents the lowest residual stresses throughout the hole thickness, we propose to solve this problem by varying the mandrel taper degree, instead of applying a double expansion. The obtained results show that the tapered pin is more suitable for the cold expansion. More, low taper increases the residual stresses at the entrance, reaching the values generated at the exit face.

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“…Jang et al 14 proposed a new method that involved chamfering of the holes before cold expansion, and the results of its experimental implementation revealed significant fatigue-life improvement compared to cold expansion without chamfering. Rana et al 15 implemented similar fatigue-life enhancement techniques and conducted fatigue tests to investigate the effect of the chamfer shape on the improvement of the fatigue life of a cold-expanded hole.…”

Section: Introductionmentioning

confidence: 99%

Effects of chamfering, cold expansion, bolt clamping, and their combinations on fatigue life of aluminum–lithium alloy single plate

Huang

Guan

et al. 2018

Advances in Mechanical Engineering

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The objective of this study was to establish the effects of cold expansion, chamfering, bolt clamping, and their combinations on the fatigue life of an aluminum-lithium alloy single plate. Fatigue tests were conducted to quantify the antifatigue effects of the different techniques. A scanning electron microscope was used to perform fracture analyses of the used specimens, and the residual stresses were measured using an X-ray diffraction device. In addition, threedimensional finite element models of the specimens were established and used to characterize their stress states, and the Smith-Watson-Topper method was used to predict the fatigue lives of the specimens. The fatigue test results showed that all the considered processes improved the fatigue life of the pristine specimen. The most effective was a combination of 3.2% cold expansion, 1-mm chamfering, and bolt clamping using a 6.4-N m torque, which improved the fatigue life of the pristine specimen by a factor of 15.5. The finite element method results also revealed that this combination decreased the maximum stress and confirmed its superiority in relation to the other fatigue-life enhancement techniques in terms of the anti-fatigue effect. The Smith-Watson-Topper method underestimated the specimen fatigue life, but the accuracy satisfied engineering requirements.

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The effect of hole shape on the extent of fatigue life improvement by cold expansions

Cited by 29 publications

References 20 publications

Improvement of Fatigue Life of a Holed Specimen of Aluminum-Alloy 2024-T3 by Indentation and Hole Expansion

Improvement of Fatigue Life of a Holed Specimen of Aluminum-Alloy 2024-T3 by Indentation and Hole Expansion

Numerical Analysis and Optimization of the Residual Stresses Distribution Induced by Cold Expansion Technique

Effects of chamfering, cold expansion, bolt clamping, and their combinations on fatigue life of aluminum–lithium alloy single plate

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