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

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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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.

Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut125-136
Sivumäärä12
JulkaisuINTERNATIONAL JOURNAL OF FATIGUE
Vuosikerta99
TilaJulkaistu - 1 kesäkuuta 2017
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

ID: 11247527