scholarly journals Fatigue Strength Evaluation Method Using Local and Structural Stress Concentration Factors for Weld Toe of Welded Joint

1996 ◽  
Vol 1996 (180) ◽  
pp. 509-519
Author(s):  
Isao Soya
Keyword(s):  
Fatigue Strength ◽  
Stress Concentration ◽  
Evaluation Method ◽  
Welded Joint ◽  
Structural Stress ◽  
Strength Evaluation ◽  
Weld Toe ◽  
Concentration Factors ◽  
Stress Concentration Factors

scholarly journals Stress Concentration Factors for Welded Plate T-Joints Subjected to Tensile, Bending and Shearing Loads

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 546
Author(s):  
Krzysztof L. Molski ◽  
Piotr Tarasiuk
Keyword(s):  
Stress Concentration ◽  
Plate Thickness ◽  
Percentage Error ◽  
Geometrical Parameters ◽  
T Joints ◽  
Loading Mode ◽  
Weld Toe ◽  
Concentration Factors ◽  
Parametric Expression ◽  
Stress Concentration Factors

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.

A Photoelastic-Fatigue Programme of Experimental Research in Connection with Bolted Joints

1954 ◽  
Vol 58 (522) ◽  
pp. 435-438 ◽  
Author(s):  
E. W. C. Wilkins ◽  
H. T. Jessop
Keyword(s):  
Fatigue Strength ◽  
Stress Concentration ◽  
Experimental Research ◽  
Bolted Joints ◽  
Supply Contract ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Parallel Series

An outline is given of a combined photoelastic and fatigue programme of work on single-pin double-strap joints; the stress concentration factors obtained from photoelastic tests are to be correlated with the results from a parallel series of metal fatiguetests on geometrically similar specimens. The form and dimensions for a photoelastic specimen suitable for this work are given. Further results will be published as the work proceeds. This Note outlines a programme of work recently initiated by the Royal Aeronautical Society, and now being done under Ministry of Supply contract, in connection with the fatigue strength of bolted joints.

Alternate Design Solutions for Reduced Stress Concentration Factor (SCF) T Joints of Circular Hollow Structures

2014 ◽  
Vol 1029 ◽  
pp. 44-49
Author(s):  
Gabriel Dima ◽  
Teodor Machedon-Pisu ◽  
Ion Balcu
Keyword(s):  
Stress Concentration ◽  
Analytical Calculation ◽  
Tubular Structures ◽  
Element Analysis ◽  
Hollow Structures ◽  
Development Teams ◽  
Practical Design ◽  
Weld Toe ◽  
Concentration Factors ◽  
Stress Concentration Factors

Design for fatigue of lightweight welded tubular structures is a significant concern of development teams. Based on practical design experience, alternate T joint design to usual Circular Hollow Structures (CHS) T joins are proposed. Proposed designs employ formed members within relevant dimensions range. A method based on finite element analysis including weld modelling was used, with analytical calculation of weld toe stress. Stress concentration factors (SCF) are calculated for all proposed designs for all typical load cases. Best placement and dimensions of formed members is given, together with design recommendations.

Computation of Stress Concentration Factors for Tubular Joints

2013 ◽  
Author(s):  
Philippe Thibaux ◽  
Steven Cooreman
Keyword(s):  
Stress Concentration ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Tubular Joints ◽  
Element Size ◽  
Out Of Plane ◽  
Weld Toe ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Bending Modes

Stress concentration factors for tubular joints were computed using solid quadratic elements. The results of the computations are compared with experiments reported in the literature and with expressions reported in the literature and in design codes. An influence of element size and element type was observed, which leads to recommendations regarding element size of four quadratic elements in thickness, which is finer than in different published recommendations. A parametric study was performed, showing that stress concentration factors from the literature are not always conservative, particularly at the crown toe of the chord, while they tend to be overconservative at the chord saddle. The stress concentration factor for the inside of the member was also computed; it is found that it can be close to the stress concentration factor at the weld toe for both the in plane or out of plane bending modes.

Stress Concentration Factors at Welded Connections Between Tubular Sections and a Transverse Plate

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Inge Lotsberg
Keyword(s):  
Stress Concentration ◽  
Wind Turbines ◽  
Oil And Gas ◽  
Superposition Principle ◽  
Gas Production ◽  
Oil And Gas Production ◽  
Weld Toe ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Weld Root

Abstract Welded connections between tubulars and transverse plates are used to build together part structures such as support of flare towers and wind turbines and deck structures on foundation structures. They are used in traditional jacket structures for oil and gas production and in support structures for wind turbines. These welded connections are typically made from the outside resulting in a weld root on the inside and a weld toe on the outside. Different S–N curves apply to these positions; therefore, stresses both on the inside and the outside are needed for fatigue assessment. From the actual design, it is noted that the thicknesses of the tubulars being connected can be different. Also, the diameters of the tubulars can be different. In addition, the fabrication is associated with some fabrication tolerances that provide local eccentricity moments to be transferred through these connections. In this paper, analytical expressions for stress concentration factors for these connections are presented based on classical shell theory. The stress concentration is dependent on the radial restraint from the transverse plate and the eccentricity of the neutral axes in the tubular thickness of one tubular relative to the other tubular. The superposition principle is used to derive resulting stress concentration factors for the inside weld root and the outside weld toe.

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