A unified approach for describing metallic fatigue short and long crack growth behaviors via plastic accumulated damage. (January 2023)

• Record Type: Journal Article
• Authors: Su, Molin; Feng, Chao; Peng, Chentao; Xu, Lianyong; Han, Yongdian; Zhao, Lei
• Is Part Of: International journal of fatigue. Volume 166(2023)
• Publication Date: 2023-01
• Subjects: Short crack -- Accumulated damage -- Monotonic tensile -- Crack tip displacement -- Stress intensity factor; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.107258
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: An approach for da/dN was obtained by crack tip displacements in monotonous and cyclic zones. Metallic ability to resist crack was considered in this model to eliminate the effect material factor. da/dN under variables of materials, stress, crack size, microstructures, was linear to this model. Abstract: This work investigated the crack growth behaviors of EH36 joints, 316H steels, 6063-T6 and TC4 alloys at room temperature, proposing a unified approach. This model was achieved via the product of monotonic tensile crack tip displacement ( φ mt ) and cyclic crack tip displacement ( φ c ), in which φ mt also considered the metallic capability to affect crack propagation behavior to eliminate the effect of material factor on crack growth rate ( da/dN ). Cyclic plastic zone size ( r cp ) in φ c could describe short crack process and K in φ mt could be used for the presentation of long crack behavior. Based on this method, metallic da/dN were linearly related to φ mt φ c under several variables, such as stress, microstructures, crack scale and loading ratio.