A uniform volume-based fatigue indicator for high- and low-cycle assessment of notched components. (March 2021)

• Record Type: Journal Article
• Authors: Feng, Liuyang; Qian, Xudong; Jiang, Rongrong
• Is Part Of: International journal of fatigue. Volume 144(2021)
• Publication Date: 2021-03
• Subjects: Volume-based fatigue indicators -- Control volume -- Fatigue test -- S-N curve -- Crack initiation; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2020.106048
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: We propose a volume based fatigue indicator for both high-cycle and low-cycle fatigue. We have validated this volume based fatigue indicator for both HCF and LCF conditions. The proposed approach allows assessment of HCF and LCF simultaneously. Abstract: This study aims to develop a volume-based indicator, which assesses notched components under combined high- and low-cycle loadings. The fatigue driving force derives from the average strain energy density in a half-circle control volume ahead of the notch tip. The proposed approach describes the crack propagation ahead of a notch tip as a series of initiation events over a sequence of control volumes ahead of the tip. The experimental evidence confirms that a 0.3 mm radius of the control volume for S355 steel predicts closely the fatigue crack initiation and propagation for notched specimens under both high-cycle and low-cycle actions.