Effect of edge distance ratio on residual stresses induced by cold expansion and fatigue life of TC4 plates

Liu, Jun; Wu, Henggui; Yang, Jinjie; Yue, Zhufeng

doi:10.1016/j.engfracmech.2013.05.012

Cited by 33 publications

(12 citation statements)

References 18 publications

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“…These areas are poorly expanded and reduce the efficiency of the process, the least compressive areas being the most vulnerable. While considering hard alloys, Liu et al [16] numerically identified relatively low circumferential residual stress in the entry side of the mandrel, of about -300 MPa and therefore far from the compressive yield stress of Ti-6Al-4V. This phenomenon was also observed by Rufin [9].…”

Section: Numerical Modelling Of the Cold Expansion Process In Hard Almentioning

confidence: 90%

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Cold expansion process on hard alloy holes-experimental and numerical evaluation

Achard

Daidié

Paredes

et al. 2016

Mechanics & Industry

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This paper presents an evaluation of the influence of the cold expansion process on the fatigue performance of holes in hard alloys, as such materials are involved in an increasing number of aeronautical applications. Fatigue enhancement could bring significant savings for numerous possible industrial applications. However, although the cold expansion of aluminium holes has been studied widely, there have been few publications concerning this process in hard alloys and there is currently very few research activities on technique dedicated to high strength metallic holes. Thus, this work aims to define an approach to understand why processes and methodologies are suitable for obtaining effective expansion of these materials. In this article, the response of expanded holes is studied, considering various experimental parameters and for a wide range of expansion ratios. The influence on the fatigue strength of Ti-6Al-4V tensile specimens is also reported for various expansion ratios, more precisely "standard" expansion ratios and high expansion ratios. Then, a specific numerical modelling of the process is presented, which enables us to understand the impact of high expansion ratios in titanium holes and the influence on fatigue performance. A very good correlation between experimental and numerical results is observed.

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Section: Numerical Modelling Of the Cold Expansion Process In Hard Almentioning

confidence: 90%

“…Furthermore, scatter on the results is large and reduces the validity of the assumptions made. More recently, two general studies have been conducted by Yan et al [15] and Liu et al [16] regarding Ti-6Al-4V hole expansion. In addition, they observe its influence on crack propagation rate.…”

Section: Hole Cold-expansion Process For Hard Alloy Applicationsmentioning

confidence: 99%

Cold expansion process on hard alloy holes-experimental and numerical evaluation

Achard

Daidié

Paredes

et al. 2016

Mechanics & Industry

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“…Because of advantages, such as low density, high specific strength, good corrosion resistance, high toughness and fatigue resistance, Ti–6Al–4V titanium (TC4) alloy is widely used in the aviation industry 1,2 . Due to their large size, the fabrication of aeronautical structural components usually requires welding.…”

Section: Introductionmentioning

confidence: 99%

Comparison of fatigue performance of TC4 titanium alloy welded by electron beam welding and laser welding with filler wire

Long

Zhang

Zhang³

et al. 2022

Fatigue Fract Eng Mat Struct

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This research compared high‐cycle fatigue (HCF) performances of joints of Ti–6Al–4V titanium (TC4) alloy with the thickness of 30 mm welded by vacuum electron beam welding (EBW) and laser welding with filler wire (LWFW) (hereinafter referred to as EBW and LWFW joints). Under test conditions, the fatigue strength of the LWFW joint is only 65% that of the EBW joint. Based on analysis, the main reason is that a larger microhardness gradient is present in the LWFW joint. The average microhardness of the weld metal (WM) of the LWFW joint is 41 HV lower than that of base metal (BM). A lot of punctate β phases in the WM of the LWFW joint may be an important reason for its softening. The research results provide data supports for the application of the EBW and LWFW of Ti alloy in the field of aviation manufacturing.

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“…The improvement in fatigue life is almost 10 times. Liu et al [28] have used cold expansion with a split sleeve to produce residuals stress fields. They have performed numerical simulations using 3D finite element modelling.…”

Section: Introductionmentioning

confidence: 99%

“…The friction effect was included in this investigation by using the elastic coulomb friction with a friction coefficient =0.1 also primary included by Chakherlou and Vogwell [27]. Also, Liu et al [28] have studied the effect of cold expansion on prediction of fatigue life using respectively SWT model [29] and WB model [30]. It was concluded that WB model give a better result than the SWT model.…”

Section: Introductionmentioning

confidence: 99%

Effect of cold expansion on improving of fatigue initiation life in Aluminium alloy

Habiri

Benachour

2018

Frattura Ed Integrità Strutturale

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In this paper, numerical investigation was carried out to quantify the effect of the cold expansion on fatigue crack initiation in Aluminium alloy. The improvement in fatigue initiation life of specimen after the cold expansion process was investigated with the drilled hole of 2024 T351 Aluminium alloy plate. The applied degree of expansion (DCE%=100 (Dd)/d) is 4.6% where the effect of friction (µ=0.2) is considered. Residual stress field is determined using 3D Finite Element Analysis and shows the presence of compressive residual stress around the hole. The results showed a high compressive residual stress near the hole in exit face of the hole and at middle of the plate thickness around the hole. Local strain approach is applied in evaluation of fatigue initiation lives under Afgrow environment code. Fatigue initiation lives are improved by the presence of the compressive residual stresses comparatively to the drilled hole without of compressive residual stresses. Also, the fatigue initiation lives are increased with the increase in stress ratio for drilled hole and expanded hole Citation: El Habiri, Med., Benachour, M., Benachour, N., Effect of cold expansion on improving of fatigue initiation life of Aluminium alloy, Frattura ed Integrità Strutturale, 46 (2018) 34-44.

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Effect of edge distance ratio on residual stresses induced by cold expansion and fatigue life of TC4 plates

Cited by 33 publications

References 18 publications

Cold expansion process on hard alloy holes-experimental and numerical evaluation

Cold expansion process on hard alloy holes-experimental and numerical evaluation

Comparison of fatigue performance of TC4 titanium alloy welded by electron beam welding and laser welding with filler wire

Effect of cold expansion on improving of fatigue initiation life in Aluminium alloy

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