Abstract

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Title:: Analysis on Influence of Welding Residual Stress on Ultimate Bearing Capacity of Y-joints

Author(s):: GAO Zhan-yuan; GUO Yan-lin; Department of Civil Engineering, Tsinghua University

Keywords:: Y-joint; ultimate bearing capacity; Newton-Raphson method; arc-length method; welding residual stress; parameter analysis

Abstract:: The welding process of Y-joint was simulated by using thermal structure indirect coupling and birth-death element in ANSYS. Combined Newton-Raphson method and arc-length method, the ultimate bearing capacity of Y-joints was solved, and solution flow was given. The influence of geometric parameters such as the ratio of diameter of branch pipe and diameter of pipe, angle of branch pipe, ratio of diameter and thickness of pipe, on the ultimate bearing capacity of Y-joints with considering welding residual stress was analyzed. Ultimate bearing capacities of Y-joints with welding residual stresses and without welding residual stresses were compared and analyzed. The results show that the ultimate bearing capacity of Yjoint is reduced by welding residual stress; because values of the βare larger, or values of the γ are smaller, or values of the θare smaller, the ultimate bearing capacity of Y-joint is more reduced. In structural design, to ensure the strength and safety of structure, choosing the suitable diameter and angle of branch pipe, wall thickness of pipe, the effect of welding residual stress on ultimate bearing capacity of Y-joint can be reduced.