Effect of defects on load-carrying capability of fillet welded T-joints


Wu, Aihui, Mellor, B.G. and Syngellakis, S. (2008) Effect of defects on load-carrying capability of fillet welded T-joints. Journal of Tongji University (Natural Science), 36, (2), 155-160.

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Description/Abstract

The effect of defects on the load-carrying behaviour of welded joint is investigated based on experimental and finite element studies on two types of fillet welded T-joints, one with various defects (referred to as T1) and the other of good quality (referred to as T2). Weld defects are examined through standard metallographic procedure. Material properties are obtained from tensile and hardness tests. The failure load, failure mode and load-strain curve of the T-joints under bending are recorded with strain gauge measurement and photography. Design strength of the joints specified by various codes are calculated and compared with the experimental results. T1 specimens are found to fail at a load much lower than the design strength, while the T2 specimens carried the load higher than the codes specified by 30% ~40% .Finite element simulation of the bending test is performed, providing detailed information of the stress and strain development and distribution around the welded area. Together with an additional study on the failure initiation position and crack propagation, weld defects
are found to be the main reason for the strength reduction of the T1 specimens. Weld throat is found not to be the failure plane and stresses are not uniformly distributed over the failure plane as assumed by codes.

Item Type: Article
ISSNs: 0253-374X (print)
Related URLs:
Keywords: practical bending, couplings, cracks, failure (mechanical), finite element analysis, hardness testing, strain gauges, tensile testing, welding welds/ load-carrying capability, fillet welded T-joints, finite element studies, weld defects, standard metallographic procedure, tensile test, hardness test, failure load, failure mode, load-strain curve, bending test, strain gauge measurement, photography, design strength, failure initiation position, crack propagation; weld throat/ E2210 Mechanical components, E0210L Numerical analysis, E1630 Testing, E2180B Plasticity (mechanical engineering), E2180E Fracture mechanics and hardness (mechanical engineering), E1520E Joining processes and welding
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 149153
Date Deposited: 30 Apr 2010 13:53
Last Modified: 27 Mar 2014 19:08
URI: http://eprints.soton.ac.uk/id/eprint/149153

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