Probabilistic Fatigue Property of Aluminium Alloy Welded Joint for High-Speed Train

Abstract

Four kinds of aluminum alloy welded joints widely used in car-body for high-speed train were experimentally examined to clarify their probabilistic fatigue properties. Based on BS8118 and IIW standard criterions, the probabilistic fatigue limits for these four welded joints, corresponding to loading cycle of 2×106, are evaluated under two different loading modes. In terms of the extrapolation proposed by Eurocode 9 criterion, the corresponding probabilistic S-N curves in very high cycle regime are obtained, combined with grouping method and lifting and lowering method.

Fatigue life prediction of welded joints based on improved support vector regression model under two‐level loading

“…To investigate the applicability and capability of the WOA-SVR model, experimental data in the literature [40][41][42][43][44][45][46][47][48][49][50][51][52][53] are used. Fatigue analysis database of welded joints under two-level loading is established.…”

“…It involves 14 common metal materials, welded joint materials, and welded joints, as shown in Table 1. These 14 materials are Al-2024-T42, 40 45 steel (A), 41 butt joint, 42,43 corner joint, 42,43 Ti-6Al-4V(A), 44 GS61, 45 Ti-6Al-4V(B), 46 Al-7070-T7451, 47 45 steel (B), 48 16Mn steel (A), 49 16Mn steel (B), 50 Q235B steel joint, 51 C35 steel, 52 and P355NL1. 53 The collected materials and welded joints have been widely used in industrial fields such as high-speed rail and aviation manufacturing.…”

“…According to the literature, 42,43 the base material of the welded joint is ENAW6005, which is widely used in the body of the high-speed EMU. The chemical composition and mechanical performance for the material are shown in Table 3; the σ b , σ s , and A are yield strength, tensile strength, and elongation after breaking, respectively.…”