Fatigue failure probability estimation of the 7075-T651 aluminum alloy under multiaxial loading based on the life-dependent material parameters concept

• Published in: International journal of fatigue Vol. 147; p. 106174
• Main Authors: Karolczuk, Aleksander, Kluger, Krzysztof, Palin-Luc, Thierry
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2021; Elsevier
• Subjects: 7075-T651 aluminum alloy; Engineering Sciences; Fatigue life prediction; Life-dependent material parameter; Multiaxial fatigue criterion; Probability of failure; Life-dependent material parameter; Fatigue life prediction; Probability of failure; Multiaxial fatigue criterion; 7075-T651 aluminum alloy
• ISSN: 0142-1123; 1879-3452
• DOI: 10.1016/j.ijfatigue.2021.106174

•Results of new fatigue tests on 7075-T651 aluminum alloy are presented.•The concept of life-dependent material parameters improved fatigue life prediction.•Monte-Carlo method is applied to estimate failure probability distribution.•S-N curve of Kohout-Vechet model is applied in the Monte-Carlo sampling technique. Fatigue life prediction under a requested failure probability is essential to the modern engineering design process. Hence, the validation of multiaxial life prediction models is important with regard to not only the median fatigue lives but also their ability to estimate the failure probability. Herein, the concept of life-dependent material parameters is enhanced by introducing the fatigue life scatter assessment methodology. Aiming to analyze the ability of the life-dependent material parameter concept to calculate the failure probability distribution, we verified this concept’s new ability on a set of stress-based fatigue criteria and new experimental results on 7075-T651 aluminum alloy.