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

•Fatigue lifetimes of samples subjected to complex multiaxial spectrum are measured.•Different simulation tools to predict fatigue lifetime are evaluated.•Incremental damage model can forecast lifetime with and without overload. This study deals with fatigue of a 1045 carbon steel subjected to a cyc...

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Bibliographic Details
Published in:International journal of fatigue 2018-12, Vol.117, p.461-470
Main Authors: Dal Cero Coelho, F., Vu, Q.H., Halm, D., Nadot, Y.
Format: Article
Language:English
Subjects:
Carbon steels
Chassis
Chemical Sciences
Comparative analysis
Complex loading spectrum
Criteria
Damage
Damage assessment
Experiments
Fatigue life
Fluid mechanics
Life prediction
Linearity
Load
Material chemistry
Materials fatigue
Mechanics
Modelling
Non linear cumulative damage
Nonlinearity
Parameter identification
Physics
Plasticity/damage model
Polymers
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Summary:•Fatigue lifetimes of samples subjected to complex multiaxial spectrum are measured.•Different simulation tools to predict fatigue lifetime are evaluated.•Incremental damage model can forecast lifetime with and without overload. 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.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2018.08.013