A damage gradient model for fatigue life prediction of notched metallic structures under multiaxial random vibrations. Issue 9 (8th July 2020)

• Record Type: Journal Article
• Authors: Luo, Zhengbo; Chen, Huaihai; Zheng, Ronghui; Zheng, Wei
• Is Part Of: Fatigue & fracture of engineering materials & structures. Volume 43:Issue 9(2020)
• Page Start: 2101
• Page End: 2115
• Publication Date: 2020-07-08
• Subjects: correlation -- damage gradient -- multiaxial random vibrations -- notch -- theory of critical distance -- vibration fatigue; Materials -- Fatigue -- Periodicals; Fracture mechanics -- Periodicals; 620.1123
• DOI: 10.1111/ffe.13290
• Languages: English
• ISSNs: 8756-758X

Abstract

Abstract: In the present paper, a damage gradient model combing the damage concept with the theory of critical distance (TCD) is established to estimate the fatigue lives of notched metallic structures under multiaxial random vibrations. Firstly, a kind of notched metallic structure is designed, and the biaxial random vibration fatigue tests of the notched metallic structures are carried out under different correlation coefficients and phase differences between two vibration axes. Then, the fatigue lives of the notched metallic structures are evaluated utilizing the proposed model with the numerical simulations. Finally, the proposed model is validated by the experiment results of the biaxial random vibration fatigue tests. The comparison results demonstrate that the proposed model can provide fatigue life estimation with high accuracy.