Generalized Formulation for Fatigue Assessment of Laser Stake-welded T-joints Varying Thicknesses and Loading Conditions

The present work considers the evolution of the crack tip plasticity ahead of the crack-like notches with varying the loading condition and the thickness of laser stake-welded T-joints. A general procedure is described for the fatigue assessment of the joints under different loading conditions and made of different thicknesses. The new method is based on the analyses of the first order plastic radius (according to Irwin) for pure mode I, and it is generalized to mixed mode (I+II) by using the Minimum Plastic Zone Radius (MPZR) criterion. The method is validated, in the end, with a case study and explains why the fatigue slope m varies for joints loaded under bending/tension and when the thickness is reduced. The results prove that the procedure gives an excellent estimation of the fatigue life.

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welded joints, thin plates, Laser stake-welds

DOI

10.1051/matecconf/201926903001

Citation

Gallo, P, Remes, H & Romanoff, J 2019, Generalized Formulation for Fatigue Assessment of Laser Stake-welded T-joints Varying Thicknesses and Loading Conditions. in IIW 2018 - International Conference on Advanced Welding and Smart Fabrication Technologies. vol. 269, 03001, MATEC web of conferences, EDP Sciences, International Conference on Advanced Welding and Smart Fabrication Technologies, Bali, Indonesia, 15/07/2018. https://doi.org/10.1051/matecconf/201926903001

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https://urn.fi/URN:NBN:fi:aalto-201905062896

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[article-cris] Insinööritieteiden korkeakoulu / ENG

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Generalized Formulation for Fatigue Assessment of Laser Stake-welded T-joints Varying Thicknesses and Loading Conditions

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