An energy principles based model for fatigue crack growth prediction. (November 2019)

• Record Type: Journal Article
• Authors: Cheng, Ankang; Chen, Nian-Zhong; Pu, Yongchang
• Is Part Of: International journal of fatigue. Volume 128(2019)
• Publication Date: 2019-11
• Subjects: Fracture mechanics -- Fatigue crack growth (FCG) -- Fracture process zone (FPZ) -- Energy principles; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2019.105198
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: An energy principles based model is proposed for fatigue crack growth (FCG). Proposed model works well under fully reversed constant-amplitude cyclic loads. Combined with Walker equation, proposed model accounts for the stress ratio effect. Proposed model only needs fundamental deformation properties (FDPs) for prediction. Abstract: An energy principles based model is developed for fatigue crack growth (FCG) prediction. According to the equilibrium relationship between released strain energy and irrecoverable stored energy accumulated along the length of fracture process zone (FPZ), the FCG rate is calculated through dividing the accumulated stored energy by the elementary fracture released energy in each load cycle. The elementary fracture released energy is determined from the cyclic strain energy release rate. The accumulated stored energy is obtained by integrating the crack-tip stresses within the FPZ length. Comparison between model prediction and FCG test data is made and good agreement is observed.