A simplified continuum damage mechanics based modeling strategy for cumulative fatigue damage assessment of metallic bolted joints. (February 2020)

• Record Type: Journal Article
• Authors: Liu, Ning; Cui, Xiaodong; Xiao, Jian; Lua, Jim; Phan, Nam
• Is Part Of: International journal of fatigue. Volume 131(2020)
• Publication Date: 2020-02
• Subjects: Continuum damage mechanics -- Critical plane -- Non-proportional loading -- Multiaxial high-cycle fatigue -- Metallic bolted joint -- Pre-tension -- Cycle jumping; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2019.105302
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: We developed cumulative fatigue damage modeling approach for metallic bolted joints. Continuum damage mechanics based critical plane method was proposed. A cycle jumping algorithm with a fixed damage evolution rate is adopted. A simplified modeling strategy that only depends on the maximum stress states. Our approach is applicable to non-proportional multiaxial loading conditions. Abstract: Fatigue damage and consequent failure account for the majority of the failure in metallic bolted joints of aerospace and mechanical engineering applications. In this paper, we present a cumulative fatigue damage evaluation approach for metallic bolted joints based on a combined continuum damage mechanics (CDM) theory and the critical plane approach. The analysis approach is applicable to both proportional and non-proportional multiaxial loading conditions. A cycle jumping based algorithm with a fixed damage evolution rate is adopted for efficient numerical approximation. To further increase the computational efficiency, a simplified modeling strategy is developed to avoid the expensive calculation of the full loading-unloading cyclic stress history. The proposed approach is established based on the assumption that a linear relation can be established between the minimum and maximum stress tensors in high-cycle fatigue analysis and is thus only dependent on the maximum stress states. A set of examples including a notched specimen and a metallic bolted joint with pre-tension are simulated to demonstrate the simplified approach.