Three-dimensional finite element analyses of repair process and safety margin assessment

Chen, Mingya; Wang, Yu; Xue, Fei; Fan, Mingyu; Jia, Wenqing; Chen, Zhilin; Ku, Francis H.; Wang, Weiqiang; Shi, Jin-Xing

doi:10.1016/j.ijpvp.2019.03.020

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…Studies on repair welding are conducted in the fields of piping components, aeronautic structures, and bridges, and most of them focused on changes in the mechanical properties, microstructure, and residual stress of the weld zone after repair welding. 6–12 Luo et al 6 investigated the effect of the welding heat input in repair welding using 304 stainless steel. They reported that cracks easily occur when the welding heat input is small because the mechanical properties of the heat-affected zone (HAZ) deteriorate.…”

Section: Introductionmentioning

confidence: 99%

“…Gorka et al 7 reported that when repair welding is conducted using the S700MC steel, the impact absorption decreases, and the hardness increases in the weld metal and HAZ. Chen et al 9 suggested a method for simulating repair welding using finite element analysis (FEA). Bonnaud 10 compared a 3D finite element model and a 2D finite element model for simulating repair welding and observed a difference in the residual-stress distributions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of multiple weld repairs on fatigue strength of bogie frame of railroad vehicle

Seo,

Hur,

Kwon

et al. 2023

Advances in Mechanical Engineering

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In the welded structure of railroad vehicles, the bogie frame requires a service life more than 25 years, cracks occur in the weld zone owing to the application of repetitive fatigue loading during operation. When cracks occur and propagate in the weld zone, they are removed through gouging, and gas metal arc welding is performed for repair. After the first weld repair, the second weld repair process is performed if crack is visible in the same area. In this study, the effects of repetitive repair welding on the fatigue characteristics were investigated using materials applied in railway vehicle structures. Three types of specimens (weld specimen, first weld repairs specimen, and second weld repairs specimen) were prepared, and fatigue and residual stress tests were performed. The results indicated that the weld specimen had the longest fatigue life, and the first weld repairs specimen had the shortest fatigue life. The fatigue life of the second weld repairs specimen was longer than that of the first weld repairs specimen. Residual stress tests and finite-element analysis results indicated that the first weld repairs specimen had the shortest fatigue life among the specimens tested, because the highest residual stress was generated.

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