Probabilistic fatigue evaluation of notched specimens considering small sample properties under multiaxial loading

He, Yingbao; Liu, Jianhui; Lu, Jumei; Wang, Jie; Feng, Ruicheng; Ren, Junqiang

doi:10.1016/j.tafmec.2024.104316

Theoretical and Applied Fracture Mechanics

2024

DOI: 10.1016/j.tafmec.2024.104316

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Probabilistic fatigue evaluation of notched specimens considering small sample properties under multiaxial loading

Yingbao He,

Jianhui Liu,

Jumei Lu

et al.

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2024

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Cited by 4 publications

References 67 publications

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Probabilistic fatigue life prediction of notched specimens based on modified stress field intensity method under multiaxial loading

Wu,

Liu,

Wang

et al. 2024

International Journal of Pressure Vessels and Piping

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Probabilistic fatigue life prediction of notched specimens based on modified stress field intensity method under multiaxial loading

Wu,

Liu,

Wang

et al. 2024

International Journal of Pressure Vessels and Piping

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Multiaxial low-cycle fatigue life model for notched specimens considering small sample characteristics

Wu,

Liu,

Wang

et al. 2024

IJSI

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PurposeSufficient sample data are the necessary condition to ensure high reliability; however, there are relatively poor fatigue test data in the engineering, which affects fatigue life's prediction accuracy. Based on this, this research intends to analyze the fatigue data with small sample characteristics, and then realize the life assessment under different stress levels.Design/methodology/approachFirstly, the Bootstrap method and the principle of fatigue life percentile consistency are used to realize sample aggregation and information fusion. Secondly, the classical outlier detection algorithm (DBSCAN) is used to check the sample data. Then, based on the stress field intensity method, the influence of the non-uniform stress field near the notch root on the fatigue life is analyzed, and the calculation methods of the fatigue damage zone radius and the weighting function are revised. Finally, combined with Weibull distribution, a framework for assessing multiaxial low-cycle fatigue life has been developed.FindingsThe experimental data of Q355(D) material verified the model and compared it with the Yao’s stress field intensity method. The results show that the predictions of the model put forward in this research are all located within the double dispersion zone, with better prediction accuracies than the Yao’s stress field intensity method.Originality/valueAiming at the fatigue test data with small sample characteristics, this research has presented a new method of notch fatigue analysis based on the stress field intensity method, which is combined with the Weibull distribution to construct a low-cycle fatigue life analysis framework, to promote the development of multiaxial fatigue from experimental studies to practical engineering applications.

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Fatigue life prediction of notched components based on energy gradient using reconstructed critical distance theory

Lu,

Liu,

Zhou

et al. 2024

Fatigue Fract Eng Mat Struct

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In this paper, a reasonable explanation is given to unify notch effect and geometric size effect into notch geometric feature effect (NGFE), and energy gradient is utilized to depict the influence of the NGFE on the critical distance. The correlation of energy gradient with critical distance and fatigue life is discussed respectively. The weight index of the high energy region is used to quantify the contribution of the high energy region to the fatigue damage. Finally, a model of the reconstructed critical distance theory considering the geometric notch characteristic effect is established. The fatigue test of Q355 (D) alloy steel notched components was carried out, and the evaluation precision of the presented method is compared with Yang’ model and Shen’ model combining with the existing fatigue test data of En8. The results indicate that prediction results of the proposed method are consistent with the test results.

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Probabilistic fatigue evaluation of notched specimens considering small sample properties under multiaxial loading

Cited by 4 publications

References 67 publications

Probabilistic fatigue life prediction of notched specimens based on modified stress field intensity method under multiaxial loading

Probabilistic fatigue life prediction of notched specimens based on modified stress field intensity method under multiaxial loading

Multiaxial low-cycle fatigue life model for notched specimens considering small sample characteristics

Fatigue life prediction of notched components based on energy gradient using reconstructed critical distance theory

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