Crack Propagation and Predication on 2024 Aluminum Alloy under Combination Action of Friction and Fatigue. Issue 1 (March 2021)

• Record Type: Journal Article
• Authors: Yan, Yutao; Jiang, Cheng; Li, Yang; Wu, Xin; Zhang, Zhao
• Is Part Of: Journal of physics. Volume 1838:Issue 1(2021)
• Publication Date: 2021-03
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1838/1/012069
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: The crack propagation of 2024 aluminum alloy under the combination action of non-lubricated sliding friction and fatigue was investigated by numerical simulation analysis and experimental methods. The variation regulation of stress intensity factors (SIFs) KI and KII, and the fatigue crack propagation under different initial crack length, tension and contact pressure was obtained. Based on numerical analysis, experiment research and Paris formula, the predication model of fatigue crack propagation rate was established. The results show that the crack is closed owing to friction force when the upper specimen slides toward the crack, while is torn as sliding away. When the upper specimen moves in the near crack zone, there is relative motion between the crack faces caused by contact pressure. The crack appears slip-open effect. In according to numerical analysis and experimental results, the crack propagation is I-II composite crack forms. The comprehensive influence on I-II composite fatigue crack propagation from large to small is tension, contact pressure and initial crack length. The predication model is verified to reasonable and effective by the new test investigation.