Abstract
The paper deals with the problem of stress concentration at the weld toe of a plate T-joint subjected to axial, bending, and shearing loading modes. Theoretical stress concentration factors were obtained from numerical simulations using the finite element method for several thousand geometrical cases, where five of the most important geometrical parameters of the joint were considered to be independent variables. For each loading mode—axial, bending, and shearing—highly accurate closed form parametric expression has been derived with a maximum percentage error lower than 2% with respect to the numerical values. Validity of each approximating formula covers the range of dimensional proportions of welded plate T-joints used in engineering applications. Two limiting cases are also included in the solutions—when the weld toe radius tends to zero and the main plate thickness becomes infinite.
Highlights
Welded Plate T-Joints Subjected to Welded T-connections are commonly used engineering structures
Several thousand Stress concentration factor (SCF) solutions obtained using the Finite Element Method (FEM) as well as corresponding parametric Equations (A1)–(A3) of high accuracy and a wide range of validity, made it possible to draw some more general conclusions regarding the influence of particular geometrical parameters on SCF
It may be assumed that the range of validity of the formulas (A8) and (A13), proposed by Tsuji [17], is similar to that for Equations (A7) and (A11) reported by Ushirokawa and Systematic numerical FEM modelling including more than 22,600 cases of welded plate T-joints made it possible to derive three approximating SCF’s formulas for axial, bending, and shearing loads
Summary
Welded Plate T-Joints Subjected to Welded T-connections are commonly used engineering structures. The fatigue failure of welded structural components subjected to cyclic loads is the most frequent cause of damage, which begins at critical zones where stress concentration occurs [1]. Some examples of fatigue analysis in tubular joints applied to various types of structures and devices are given in References [8,9,10,11,12] where stress concentration plays a key role. Numerous formulas of stress concentration factors for various types of welded T-joints, based on the finite and boundary element analyses, were presented in References [16,17,18,19,20]
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