Traction stress-based fatigue failure mode identification of load-carrying welded cruciform joints. (August 2022)

• Record Type: Journal Article
• Authors: Wei, Zezhong; Pei, Xianjun; Qian, Xudong; Xing, Shizhu; Feng, Liuyang; Jin, Hui
• Is Part Of: International journal of fatigue. Volume 161(2022)
• Publication Date: 2022-08
• Subjects: Load-carrying welded cruciform joint -- Weld geometry -- Gap -- Weld root failure -- Traction stress -- Fatigue failure criteria; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.106897
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: This study proposes an analytical solution of traction stress at the weld root of LCWCJs. This study suggests fatigue failure criteria to differentiate toe and root failures of LCWCJs. The effect of geometric parameters on fatigue failure of LCWCJs is discussed. Effective fatigue design for load-carrying welded cruciform joints is suggested. Abstract: This paper proposes an analytical solution of traction stress at the weld root of load-carrying welded cruciform joints, incorporating the effects of weld geometry, especially the gap between the loading and intermediate plates. Additionally, this study suggests fatigue failure criteria to differentiate toe and root failures and verifies these criteria by 372 experimental data. Results indicate that: (1) the analytical solution can quantify the stress state at the weld root and predict the root cracking angle; (2) the failure criteria are adequate to judge toe and root failures with high accuracy. Finally, weld geometry effects are discussed, and fatigue design for joints is suggested.