Probabilistic fatigue life prediction of small sample properties notched specimens under multiaxial loading

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-12-21 DOI:10.1016/j.tafmec.2024.104836

Ziyang Zhang , Jianhui Liu , Shengchuan Wu , Qingjun Wu , Yaobing Wei

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引用次数: 0

Abstract

The multiaxial fatigue assessment of complex structures is a crucial issue in ensuring the structural integrity of modern equipment. However, in practical engineering, further progress is required in the study of small sample data, for the reliable evaluation of the fatigue life of notched specimens, and their impact on multiaxial fatigue damage evolution models. Firstly, the test data of smooth specimens is expanded, by integrating Bayesian theory and the Monte Carlo method, and a probabilistic fatigue model considering size effect under different loading conditions is established. Secondly, the influence of non-uniform stress fields and notch characteristics on fatigue crack initiation is defined, considering critical distance, with a correction to the stress field damage parameter. The relationship between fatigue life and damage variables under various loading conditions is explored, the virtual sub-sample augmentation method and the weakest link theory are combined, leading to the establishment of a multiaxial fatigue life prediction model, suitable for notched specimens. Finally, the prediction life using proposed method and other models are compared with the experimental life of three materials, the compared results show that the proposed method exhibits a notably heightened level of accuracy, and the fatigue life of notched specimens can be predicted by small samples of smooth specimens.

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.