Fatigue life modelling under variable amplitude multiaxial loading: Comparison between fatigue criterion and incremental modelling

Fabricio Dal Cero Coelho (1) , Quochuy Vu (2) , Damien Halm (3) , Yves Nadot (1)

1 ENDO - ENDOmmagement et durabilité [Institut Pprime]
2 HUST - Hanoi University of Science and Technology
3 PPrime [Poitiers] - Institut Pprime [UPR 3346]

This study deals with fatigue of a 1045 carbon steel subjected to a cyclic tension-torsion spectrum combining in-phase and out-of-phase loadings and including overload, representative of an automotive chassis loading type. The experimental lifetimes are compared to the results of two different approaches. The first one combines a multiaxial fatigue criterion able to describe out of phase loading and a non-linear damage rule. The second one is based on an incremental mesoscale plasticity/damage model. It is shown that the criterion involving a non-linear damage rule is able to describe the experimental result for full spectrum (with overload) but the identification of the non-linearity is a function of spectrum type. The incremental approach gives better results for both spectra (with and without overloads) and does not need specific parameter identification.

Mots clés: Life prediction; Complex loading spectrum; Non linear cumulative damage; Plasticity/damage model

Domaines: Mécanique des fluides [physics.class-ph]; Matériaux; Polymères

Fabricio Dal Cero Coelho, Quochuy Vu, Damien Halm, Yves Nadot. Fatigue life modelling under variable amplitude multiaxial loading: Comparison between fatigue criterion and incremental modelling. International Journal of Fatigue, 2018, 117, pp.461-470. ⟨10.1016/j.ijfatigue.2018.08.013⟩. ⟨hal-02318924⟩