Influence of crack tip plasticity on the slope of fatigue curves for laser stake-welded T-joints loaded under tension and bending

Pasquale Gallo; Heikki Remes; Jani Romanoff

doi:10.1016/j.ijfatigue.2017.02.025

Influence of crack tip plasticity on the slope of fatigue curves for laser stake-welded T-joints loaded under tension and bending

Pasquale Gallo^*, Heikki Remes, Jani Romanoff

^*Corresponding author for this work

Department of Energy and Mechanical Engineering

Research output: Contribution to journal › Article › Scientific › peer-review

18 Citations (Scopus)

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Abstract

The paper investigates the crack tip plasticity of laser stake-welded T-joints when loaded in tension and bending. Irwin's first-order plastic zone size is kept equal for the selected load levels, and finite element (FE) analyses are carried out to investigate the stress redistribution in the plastic zone varying the applied loads. The results allow us to explain why the fatigue slope m is different for bending and tension. Moreover, a new method is proposed that permits the number of cycles to failure under bending to be derived directly from the tension fatigue curve, employing an effective J-integral. The results prove that the method is able to give an estimation of the number of cycles to failure under bending with a very good approximation and acceptable errors.

Original language	English
Pages (from-to)	125-136
Number of pages	12
Journal	International Journal of Fatigue
Volume	99
DOIs	https://doi.org/10.1016/j.ijfatigue.2017.02.025
Publication status	Published - 1 Jun 2017
MoE publication type	A1 Journal article-refereed

Keywords

Crack tip plasticity
Fatigue assessment
Fatigue strength
Laser stake-welds
Slope of fatigue curve

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10.1016/j.ijfatigue.2017.02.025

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Cite this

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title = "Influence of crack tip plasticity on the slope of fatigue curves for laser stake-welded T-joints loaded under tension and bending",

abstract = "The paper investigates the crack tip plasticity of laser stake-welded T-joints when loaded in tension and bending. Irwin's first-order plastic zone size is kept equal for the selected load levels, and finite element (FE) analyses are carried out to investigate the stress redistribution in the plastic zone varying the applied loads. The results allow us to explain why the fatigue slope m is different for bending and tension. Moreover, a new method is proposed that permits the number of cycles to failure under bending to be derived directly from the tension fatigue curve, employing an effective J-integral. The results prove that the method is able to give an estimation of the number of cycles to failure under bending with a very good approximation and acceptable errors.",

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N2 - The paper investigates the crack tip plasticity of laser stake-welded T-joints when loaded in tension and bending. Irwin's first-order plastic zone size is kept equal for the selected load levels, and finite element (FE) analyses are carried out to investigate the stress redistribution in the plastic zone varying the applied loads. The results allow us to explain why the fatigue slope m is different for bending and tension. Moreover, a new method is proposed that permits the number of cycles to failure under bending to be derived directly from the tension fatigue curve, employing an effective J-integral. The results prove that the method is able to give an estimation of the number of cycles to failure under bending with a very good approximation and acceptable errors.

AB - The paper investigates the crack tip plasticity of laser stake-welded T-joints when loaded in tension and bending. Irwin's first-order plastic zone size is kept equal for the selected load levels, and finite element (FE) analyses are carried out to investigate the stress redistribution in the plastic zone varying the applied loads. The results allow us to explain why the fatigue slope m is different for bending and tension. Moreover, a new method is proposed that permits the number of cycles to failure under bending to be derived directly from the tension fatigue curve, employing an effective J-integral. The results prove that the method is able to give an estimation of the number of cycles to failure under bending with a very good approximation and acceptable errors.

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KW - Fatigue strength

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Influence of crack tip plasticity on the slope of fatigue curves for laser stake-welded T-joints loaded under tension and bending

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Keywords

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