Effect of welding-induced residual stress and distortion on ship hull girder ultimate strength

Gannon, Liam; Liu, Yi; Pegg, Neil; Smith, Malcolm J.

doi:10.1016/j.marstruc.2012.03.004

Cited by 64 publications

(12 citation statements)

References 11 publications

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“…In addition, phase transformations affect the distortion by changes of the inherent strain state within the heat-affected zone [5]. The distorted state of the joints affects the assembling process of welded structures and has remarkable influence on the strength of the weld [6][7][8]. Therefore, numerous recent publications deal with the estimation of welding distortion using transient thermo-mechanical simulation techniques or inherent strain methods [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Ottersböck

Leitner

Stoschka

2018

Metals

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In general, distortion has significant effects on the assembly process of welded structures and remarkable influences on the strength of the welds. Therefore, this work focuses on the effect of angular welding distortion on fatigue strength to improve transferability of specimen results to components. Experimental investigations cover manufacturing and fatigue testing of three single-sided transversal stiffeners series exhibiting different angular distortions. The fatigue test results of as-welded specimen show a distinct link between fatigue performance and initial angular distortion. However, in case of a high frequency mechanical impact (HFMI)-treated weld toe, the fatigue strength increases up to base material level and is independent of the distortion. A comprehensive numerical analysis reveals a complex interaction between the applied nominal load, initial specimen distortion and the local stress field. In this context, an engineering-feasible assessment is derived to estimate the local effective stresses featuring the acting local stress range as well as the stress ratio. The application of this distortion factor enables the setup of a uniform S/N-curve with a significantly reduced scatter band.

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Section: Introductionmentioning

confidence: 99%

Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Ottersböck

Leitner

Stoschka

2018

Metals

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“…In the equations given above, b is the width of the horizontal plate in mm, tw and tp denote the thicknesses of the horizontal and vertical plates in mm, 2bt is the tensile zone width of the horizontal plate, bs is the tensile zone width of the vertical plate, σy is the yield stress of the material at room temperature, while As is the cross section of the vertical plate in mm 2 . Since only the experimental measurements of horizontal plate deflections, using a Vernier caliper, are provided in Reference [22], the validation of longitudinal residual stresses was performed using two idealized solutions from the literature [23], which could provide acceptable engineering results for single-pass T-joint structures welded with MAG technology [5,24,25], and are appropriate for the evaluation of the reference model M1 (Table 3). In these two simple solutions it is assumed that the maximum residual stress along the line A-B in the middle plane of the horizontal plate ( Figure 4) is tensile and that it reaches the yield stress of the material.…”

Section: T-joint Fillet Weld Geometry and Welding Conditionsmentioning

confidence: 99%

Numerical Analysis of Longitudinal Residual Stresses and Deflections in a T-joint Welded Structure Using a Local Preheating Technique

et al. 2018

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In this paper a numerical analysis of a T-joint fillet weld is performed to investigate the influences of different preheat temperatures and the interpass time on the longitudinal residual stress fields and structure deflections. In the frame of the numerical investigations, two thermo-mechanical finite element models, denoted M2 and M3, were analyzed and the results obtained were then compared with the model M1, where the preheating technique was not applied. It is concluded that by applying the preheat temperature prior to the start of welding the post-welding deformations of welded structures can be significantly reduced. The increase of the preheat temperature increased the longitudinal residual stress field at the ends of the plates. The influence of the interpass time between two weld passes on the longitudinal residual stress state and plate deflection was investigated on two preheated numerical models, M4 and M5, with an interpass time of 60 s and 120 s, respectively. The results obtained were then compared with the preheated model M3, where there was no time gap between the two weld passes. It can be concluded that with the increase of interpass time, the plate deflections significantly increase, while the influence of the interpass time on the longitudinal residual stress field can be neglected.

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“…Most of the recent studies are based on numerical simulations employing geometrically and materially Nonlinear Finite Element Method (NLFEM) analyses, e.g. Xu et al (2012Xu et al ( , 2013, , Ozdemir & Ergin (2013), Badran et al (2013), Tanaka et al (2014), Gannon et al (2012), Tekgoz et al (2013), , Doshi & Vhanmane (2014), Choung et al (2014), , although some of the recent studies include experimental testing, e.g. Xu & Guedes Soares (2012a, b, 2013a, Shanmugam et al (2014).…”

Section: General Remarksmentioning

confidence: 99%

Progressive collapse analysis of a bulk carrier using IACS prescribed and NLFEM derived load—end shortening curves

Kitarović¹,

Andrić²,

Pirić³

et al. 2015

Towards Green Marine Technology and Transport

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This paper considers hull girder ultimate strength of a bulk carrier at its midship section, as determined by an incremental-iterative progressive collapse analysis method prescribed by the IACS Common Structural Rules for Bulk Carriers (IACS CSR-BC). In addition to the originally prescribed load-end shortening curves, curves determined by the nonlinear finite element method analysis (considering the influence of the idealized initial geometrical imperfections) are also considered. Results obtained by both sets of curves are compared and discussed on both local (structural components load-end shortening curve) and global (hull girder ultimate bending capacity and collapse sequence) level, for both sagging and hogging cases.of the hull girder submitted to bending. PCA methods are based on evaluation of the (nonlinear) bending moment to curvature relationship which describes the hull girder progressive collapse (for sagging and/ or hogging cases), which is induced by yielding and/ or various feasible buckling modes of the uncoupled discrete structural components (longitudinal stiffeners with the attached breadth of plating, hard corners and transversely stiffened plating) of the critical segment (between two adjacent transverse web frames).

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Effect of welding-induced residual stress and distortion on ship hull girder ultimate strength

Cited by 64 publications

References 11 publications

Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Numerical Analysis of Longitudinal Residual Stresses and Deflections in a T-joint Welded Structure Using a Local Preheating Technique

Progressive collapse analysis of a bulk carrier using IACS prescribed and NLFEM derived load—end shortening curves

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