Welding effect on tensile strength of grade S690Q steel butt joint

Chen, Cheng; Chiew, Sing‐Ping; Zhao, Mingshan; Lee, Chi King; Fung, T. C.

doi:10.1016/j.jcsr.2018.10.009

Cited by 41 publications

(9 citation statements)

References 23 publications

(28 reference statements)

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“…But it is well known that the fatigue performance of steel components in the as-welded condition does not substantially increase when increasing the yield or tensile strength of the base metal [10]. Furthermore, since the weldability of HSS is lower than that of mild steels [11,12], residual stresses and uneven cooling appears to be more detrimental for structural integrity than in mild steel [13][14][15][16].Consequently, the use of very high strength grades, with yield strengths above 690 MPa, in civil and mechanical engineering structures is relatively uncommon especially because of restrictive design rules and welding problems. Since welded connections are one of the most used joining techniques in structural applications, numerous studies have focused on the problem of the fatigue resistance of welds made of HSS and related improvement techniques.…”

Section: Introductionmentioning

confidence: 99%

Influence of hole-making procedures on fatigue behaviour of high strength steel plates

Jiménez-Peña

Goulas

Rossi

et al. 2019

Journal of Constructional Steel Research

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High strength steels (HSS) offer a unique opportunity to reduce the weight of civil and off-shore structures and heavy-duty machinery. Such equipment is subjected to continuous cyclic loading and therefore fatigue failure often happens where concentrations of stresses are present, the latter most of the time being caused by connection details. Previous studies have demonstrated that an increase in yield strength does not lead to a proportional increase in fatigue resistance, particularly in welded connections. In that regard, the utilisation of bolted joints is often proposed as an alternative to welded joints. The hole-making procedure is an essential factor in the assessment of the fatigue resistance of bolted joints, since different hole-making techniques yield different surface qualities and residual stresses, which consequently impact the final fatigue limit. This work addresses the effect of the main mechanical (punching, drilling and waterjet) and thermal (plasma and laser) cutting techniques on the fatigue performance of HSS plates containing holes.A series of fatigue tests with moderately thick plates made of S500MC were carried out using different hole-making techniques. The surface, geometry and residual damage of every hole-making procedure were studied by means of optical evaluation, hardness tests and roughness evaluation, and large differences were observed: drilling was found to produce the most geometrically accurate hole and the smoothest surface finish; while laser and waterjet cutting displayed the best fatigue 2 performance. The results of this research can provide an estimation of the applicability of each holemaking process to this particular HSS grade.

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Section: Introductionmentioning

confidence: 99%

Influence of hole-making procedures on fatigue behaviour of high strength steel plates

Jiménez-Peña

Goulas

Rossi

et al. 2019

Journal of Constructional Steel Research

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“…The mechanical properties of HAZ have been reported by many researchers (Amraei et al, 2019; Amraei et al, 2020; Cai et al, 2022; Chen et al, 2019; Peng et al, 2019; Peng et al, 2018; Yan et al, 2021a; Yan et al, 2022b; Yan et al, 2022c). Yan et al (2022b) found a 13% yield and 4% ultimate strength degradation in HAZ compared to BM in S355 and S500 butt-welded TMCP cold-formed RHS connections, while a larger strength reduction, 24% and 19% for the yield strength and the ultimate strength respectively, were observed in S700 connections.…”

Section: Introductionmentioning

confidence: 91%

Fracture simulation of welded RHS X-joints using GTN damage model

Yan

Xin

Mela

et al. 2022

Advances in Structural Engineering

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A welded rectangular hollow section (RHS) X-joint exposed to tension loading has three typical fracture-related failure modes: Punching shear failure (PSF), Brace failure (BF), and Chord side wall failure (CSWF). Prediction of these failure modes by finite element (FE) simulations requires modelling of the material damage. An appropriate damage model accurately predicts the behaviour of the fracture zone and provides the necessary information to improve design rules for welded high-strength steel (HSS) RHS X-joints based on parametric studies using validated model. In this paper, the parameters of the Gurson-Tvergaard-Needleman (GTN) damage model are calibrated for the base material (BM) and the heat-affected zone (HAZ) of butt-welded cold-formed RHS connections, no fracture appeared in the weld. A computational homogenisation analysis is carried out using representative volume element (RVE) models to calibrate the pressure-dependent yield surface parameters of the GTN damage model, considering the different combinations of the accumulated initial hardening strain and the void volume fraction (VVF) due to a varying stress triaxiality. The critical and final VVFs are calibrated against tensile coupon tests. Finally, the GTN damage models calibrated for BM and HAZ are used in the fracture simulation of nine welded cold-formed RHS X-joints in monotonic tension. The FE model successfully predicts the experimental load-displacement relationships and fractured zone, indicating the calibrated GTN models could effectively be used in parametric study of welded cold-formed RHS X-joints. Finally, possible improvements to the used FE model are outlined for future studies.

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“…Many experimental studies have been carried out to investigate the tensile behaviour of butt-welded high-strength steel (HSS, 460 MPa ≤ f y ≤ 700 MPa) and ultra-high-strength steel (UHSS, f y > 700 MPa) connections [1,3,6,[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. HAZ plays a vital role in the welded connection if HAZ has the lowest strength in the entire weld region.…”

Section: Introductionmentioning

confidence: 99%