Ultimate resistance of tubular double T-joints under axial brace loading

Resistance is the main property of tubular joints. The determination of the joint resistance from the experimental load-deformation curve always represents a challenging task. Currently there are two main methods to find the experimental resistance, which are called plastic and ultimate resistance. However, there is no single opinion on which one should be commonly used. Based on the experimental results, this paper directly compares the two existed approaches. The study is restricted to welded square hollow section T joints under in-plane bending moment. The paper considers only the joints with β < 0.85, i.e. when the behaviour of the joint is governed by chord face failure. The results show that plastic resistance leads to more conservative results than ultimate resistance, providing thus safer results. However, attention should be also paid to the difference between the labour intensity of the presented methods.

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Experimental Study on the Behavior of Hot-Rolled Square Tubular T-Joints under Impact Loadings

International Collaboration in Lifeline Earthquake Engineering 2016 ◽

10.1061/9780784480342.007 ◽

2017 ◽

Author(s):

Pengfei Cui ◽

Fan Chen ◽

Yanzhi Liu ◽

Jingsi Huo

Keyword(s):

Experimental Study ◽

T Joints ◽

Hot Rolled

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Defects and tensile properties of 6013 aluminum alloy T-joints by friction stir welding

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2013.12.021 ◽

2014 ◽

Vol 57 ◽

pp. 146-155 ◽

Cited By ~ 47

Author(s):

Yong Zhao ◽

Lilong Zhou ◽

Qingzhao Wang ◽

Keng Yan ◽

Jiasheng Zou

Keyword(s):

Aluminum Alloy ◽

Friction Stir Welding ◽

Tensile Properties ◽

T Joints ◽

Friction Stir

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Study on the grain morphology and fracture performance of T-joints for Ti6Al4V alloy manufactured by dual laser beam bilateral synchronous welding

Optics & Laser Technology ◽

10.1016/j.optlastec.2021.107153 ◽

2021 ◽

Vol 141 ◽

pp. 107153

Author(s):

Xiaohong Zhan ◽

Jinzhao Liu ◽

Tingyan Yan ◽

Xufeng Kang ◽

Jiahao Zhang

Keyword(s):

Laser Beam ◽

Grain Morphology ◽

Ti6al4v Alloy ◽

T Joints ◽

Fracture Performance ◽

Dual Laser

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

Materials ◽

10.3390/ma14030546 ◽

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.

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Nondestructive testing of composite T-Joints by TNDT and other methods

Polymer Testing ◽

10.1016/j.polymertesting.2020.107012 ◽

2020 ◽

pp. 107012

Author(s):

Vladimir Vavilov ◽

Arsenii Chulkov ◽

Stanislav Dubinskii ◽

Douglas Burleigh ◽

Victor Shpilnoi ◽

...

Keyword(s):

Nondestructive Testing ◽

T Joints

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Effect of Stirring Pin Rotation Speed on Microstructure and Mechanical Properties of 2A14-T4 Alloy T-Joints Produced by Stationary Shoulder Friction Stir Welding

Materials ◽

10.3390/ma14081938 ◽

2021 ◽

Vol 14 (8) ◽

pp. 1938

Author(s):

Haifeng Yang ◽

Hongyun Zhao ◽

Xinxin Xu ◽

Li Zhou ◽

Huihui Zhao ◽

...

Keyword(s):

Mechanical Properties ◽

Friction Stir Welding ◽

Rotation Speed ◽

Weld Nugget ◽

Al Alloy ◽

Nugget Zone ◽

T Joints ◽

Friction Stir ◽

Stationary Shoulder ◽

Microstructure And Mechanical Properties

In this study, 2A14-T4 Al-alloy T-joints were prepared via stationary shoulder friction stir welding (SSFSW) technology where the stirring pin’s rotation speed was set as different values. In combination with the numerical simulation results, the macro-forming, microstructure, and mechanical properties of the joints under different welding conditions were analyzed. The results show that the thermal cycle curves in the SSFSW process are featured by a steep climb and slow decreasing variation trends. As the stirring pin’s rotation speed increased, the grooves on the weld surface became more obvious. The base and rib plates exhibit W- or N-shaped hardness distribution patterns. The hardness of the weld nugget zone (WNZ) was high but was lower than that of the base material. The second weld’s annealing effect contributed to the precipitation and coarsening of the precipitated phase in the first weld nugget zone (WNZ1). The hardness of the heat affect zone (HAZ) in the vicinity of the thermo-mechanically affected zone (TMAZ) dropped to the minimum. As the stirring pin's rotation speed increased, the tensile strengths of the base and rib plates first increased and then dropped. The base and rib plates exhibited ductile and brittle/ductile fracture patterns, respectively.

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