Healing fatigue damage by laser shock peening for copper film

Liu, Xiaodong; Shang, De‐Guang; Li, Ming; Jin, Jia; Chen, Tao; Guo, Y. B.; Barkey, Mark E.

doi:10.1016/j.ijfatigue.2013.03.013

Cited by 20 publications

(11 citation statements)

References 18 publications

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“…Therefore, how to improve the fatigue property of the components has been the focus of the research. In recent years, some healing methods for metallic material have been studied by scholars, such as radial cold expansion of holes, low plasticity burnishing, laser irradiation, plasma nitriding and LSP …”

Section: Healing Methodsmentioning

confidence: 99%

“…Therefore, the damage variable D can be defined as the ratio of the damage energy dissipation with the fatigue ductility:

D = \frac{W_{D}}{W_{f}}

where W D is the consumed fatigue ductility for the damaged specimen, which is the sum of the consumed plastic strain energy per cycle, and W f is the fatigue ductility for the original specimen, which is the total plastic strain energy during the fatigue process. The fatigue ductility for material can also reflect the mechanical performance, which also can describe the fatigue strength of micro‐structural component, such as Kanda et al Liu et al found that the variation of the fatigue ductility, the sum of plastic strain energy per cycle, can be used to describe the change of fatigue life before and after LSP. According to the Ref.…”

Section: Fatigue Damage‐healing Modelmentioning

confidence: 99%

“…In recent years, some healing methods for metallic material have been studied by scholars, such as radial cold expansion of holes, 17 low plasticity burnishing, 17 laser irradiation, 18,19 plasma nitriding 20 and LSP. 21 Laser shock processing is a new surface treatment technique similar to shot peening. In recent years, several attempts have been made in the literature [22][23][24][25][26] for researching the influence of LSP.…”

Section: H E a L I N G M E T H O Dmentioning

confidence: 99%

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A nonlinear fatigue damage‐healing model for copper film by LSP

Zhang

Shang

Liu

et al. 2014

Fatigue Fract Eng Mat Struct

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The healing variable and enhancement variable were first defined by the fatigue ductility, and then based on the relationship of the damage variable, the healing variable and the enhancement variable, a nonlinear fatigue damage‐healing model was proposed for predicting the fatigue life of the healed copper film by laser shock peening (LSP). The nonlinear fatigue damage cumulative process was considered in the model for the original specimen without LSP under constant and variable amplitude loadings. The results showed that the proposed nonlinear fatigue damage‐healing model can predict the residual fatigue life for the damaged copper film specimen well.

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Section: Healing Methodsmentioning

confidence: 99%

“…Therefore, the damage variable D can be defined as the ratio of the damage energy dissipation with the fatigue ductility:

D = \frac{W_{D}}{W_{f}}

Section: Fatigue Damage‐healing Modelmentioning

confidence: 99%

Section: H E a L I N G M E T H O Dmentioning

confidence: 99%

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A nonlinear fatigue damage‐healing model for copper film by LSP

Zhang

Shang

Liu

et al. 2014

Fatigue Fract Eng Mat Struct

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“…Compared with the total fatigue lives for the undamaged and damaged specimens by LSP, the optimum parameters are obtained, which energy density is 10 × 10 3 Jm −2 and pulse number is 18 . In this investigation, the fatigue lives of notched specimens with different damage degrees were analysed under the condition of the optimum parameters.…”

Section: Methodsmentioning

confidence: 99%

“…Compared with the total fatigue lives for the undamaged and damaged specimens by LSP, the optimum parameters are obtained, which energy density is 10 × 10 3 Jm À2 and pulse number is 18. 23 In this investigation, the fatigue lives of notched specimens with different damage degrees were analysed under the condition of the optimum parameters. In order to investigate the variation of fatigue life with the change of laser parameters, two groups of fatigue tests were conducted, changing only one parameter at a time.…”

Section: E X P E R I M E N T a L P R O C E D U R Ementioning

confidence: 99%

Residual life prediction for healing fatigue damaged copper film by laser shock peening

Liu

Shang

Zhang

et al. 2013

Fatigue Fract Eng Mat Struct

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A B S T R A C T A healing method for fatigue damage was studied by laser shock peening (LSP) with excimer laser for polycrystalline copper film. It is found that work hardening due to LSP could be responsible for the improvement of residual fatigue lives for the damaged and undamaged specimens by LSP, and the hardening degree for the damaged specimen by LSP is obviously higher than that for the undamaged specimen by LSP. In this paper, two basic mechanisms were identified. One is the dissipated energy enhancement mechanism, which improves the fatigue life caused by laser shock stress, and the other is the healing mechanism, which leads to a further improvement. Based on the two mechanisms, a residual fatigue life prediction method is proposed by the view of energy consumption before and after LSP. The predicted lives by the proposed method agree well with the experimental results.Keywords laser shock peening; work hardening; dissipated energy enhancement mechanism; healing mechanism; life prediction.coefficient for the original specimen by LSP k D ¼ hardening coefficient for the damaged specimen by LSP m ¼ modified exponent of hardening degree N 0 ¼ fatigue life for original specimen N D ¼ consumed life of the damaged specimen N DEEM ¼ improved fatigue life caused by the extra plastic strain energy for the original specimen by LSP N D DEEM ¼ improved fatigue life caused by the extra plastic strain energy for the damaged specimen by LSP N LSP D¼0 ¼ fatigue life for the original specimen by LSP N HM ¼ pure healing life caused by HM N r ¼ residual life of the damaged specimen by LSP n′ ¼ cyclic hardening exponent of the material ΔW p0 ¼ plastic strain energy for the original specimen without LSP ΔW LSP;D p ¼ plastic strain energy for the damaged specimen with LSP ΔW LSP;D¼0 p ¼ plastic strain energy for the original specimen with LSP Δσ ¼ stress range Δε p ¼ plastic strain range Δε p0 ¼ plastic strain range of specimen without LSP Δε LSP p ¼ plastic strain range of specimen with LSP Δε LSP;D¼0 p ¼ plastic strain range of the original specimen with LSP Δε LSP;D p ¼ plastic strain range for the damaged specimen by LSP

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Crack Retardation of Damage Through Enhanced Crack Closure Effect Induced by Laser Peening

Cheng

2019

Lecture Notes in Mechanical Engineering

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Healing fatigue damage by laser shock peening for copper film

Cited by 20 publications

References 18 publications

A nonlinear fatigue damage‐healing model for copper film by LSP

A nonlinear fatigue damage‐healing model for copper film by LSP

Residual life prediction for healing fatigue damaged copper film by laser shock peening

Crack Retardation of Damage Through Enhanced Crack Closure Effect Induced by Laser Peening

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