Probabilistic fatigue resistance model for steel welded details under variable amplitude loading – Inference and uncertainty estimation

•A novel model to infer VA fatigue data of welded joints is proposed.•The damage limit concept has been formalized and justified using fracture mechanics.•Test data of four welded structural details are inferred and uncertainty are determined. This paper presents a probabilistic fatigue life predict...

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Bibliographic Details
Published in:International journal of fatigue 2020-06, Vol.135, p.105515-18, Article 105515
Main Authors: Leonetti, Davide, Maljaars, Johan, Snijder, H.H.
Format: Article
Language:English
Subjects:
Bridge loading
Damage
Elastic limit
Fatigue life
Fatigue limit
Fatigue strength
Fracture mechanics
Life prediction
Likelihood
Linear elastic fracture mechanics
Materials fatigue
Metal fatigue
Prediction models
Probabilistic inference
Probability theory
Reliability analysis
Reliability engineering
S N diagrams
Statistical analysis
Structural reliability
Uncertainty
Variable amplitude loading
Welded details
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Summary:•A novel model to infer VA fatigue data of welded joints is proposed.•The damage limit concept has been formalized and justified using fracture mechanics.•Test data of four welded structural details are inferred and uncertainty are determined. This paper presents a probabilistic fatigue life prediction model for welded details subjected to variable amplitude random loading, using the nominal stress approach. The proposed model makes use of CA S-N curves in combination with the relative damage rule which allows to globally account for load interaction effects, and the damage limit concept that permits the estimation of the damage for the stress ranges lower than the fatigue limit and is based on linear elastic fracture mechanics. Epistemic (sampling) and aleatory (statistical) uncertainties are estimated in a statistical framework, making the model applicable for structural reliability analyses.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2020.105515