The Characteristics of the Source of Welding Residual Stress (Inherent Strain) and its Application to Measurement and Prediction

Ueda, Y.; Yuan, Min

doi:10.1007/978-3-642-84731-8_10

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…Based on thermal elastic plastic analysis and experimental observations, Ueda et al (Ueda and Yuan, 1991;Ueda et al, 1979Ueda et al, , 1989 pointed out that a source resulting in welding deformation and residual stress must exist in a weld joint. This source is called inherent strain, which is the sum of inelastic strain components.…”

Section: Concept Of Inherent Strainmentioning

confidence: 99%

Prediction of welding distortion in a curved plate structure by means of elastic finite element method

Deng¹,

Murakawa

Liang

2008

Journal of Materials Processing Technology

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Section: Concept Of Inherent Strainmentioning

confidence: 99%

Prediction of welding distortion in a curved plate structure by means of elastic finite element method

Deng¹,

Murakawa

Liang

2008

Journal of Materials Processing Technology

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“…Accordingly, the condition for residual stress is that the yield strain is exceeded during temperature loading. Thus, it is the remaining misfit or plastic strain (generally incompatible, permanent strain, also eigenstrain [12] or inherent strain [13], [14]) that causes residual stresses, see Fig. 2 Although residual stresses can have different origins, they are all the result of local misfit [15].…”

Section: Mechanically Analogeous Modelsmentioning

confidence: 99%

05.03: Weld residual stresses effects in the design of welded plate girders: Simulation and Implementation

Launert

Pasternak

2017

ce papers

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Eurocode 3 offers different possibilities on a numerically-aided design of welded plate girders. In this, a geometrically and materially nonlinear analysis of the imperfect structure (GMNIA) provides the theoretically highest possible degree of realism. A correct implementation of "imperfections" is of critical importance in the practical application of this method. The current design rules are based on long term experience in terms of traditional ("old") welding procedures and regular ("low strength") steel grades. Thus, they provide very approximate (but safe) rules for these structures. With the introduction of modern shop welding operations and materials, many of these assumptions seem to be over-conservative. A revision of these rules is being processed in different national and international research projects. This particular study focusses on the weld residual stresses and their effects in conventional steel S355 and high strength steel S690. Metal active gas (MAG) welding under shop welding conditions was used. The measurement of weld residual stresses on component-like samples (carried out by the BAM Bundesanstalt für Materialforschung und -prüfung in Berlin) has been widely published. The hereupon based (simplified) welding simulation as part of a subsequent structural analysis is shown here. A novel numerical approach how to directly incorporate the results into large structural components models is presented. The capacity analysis is performed on a simple example for weak-axis buckling. The results indicate significant improvements in the utilization of load-bearing capacity and underline the superior buckling assignment for the S690 compared to conventional S355. The experimental validation of the findings is currently being prepared.

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“…The following part is based on the assumption that RS are caused by incompatible permanent strains (so called inherent strains [4,5]) induced by either temperature gradients and/or phase transformations. This analysis is therefore sometimes referred as plasticity-based analysis (PDA) [6].…”

Section: Plasticity-based Analysismentioning

confidence: 99%

Residual Stress Influence on the Flexural Buckling of Welded I-Girders

Launert

Rhode

Kromm

et al. 2016

Residual Stresses 2016

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Abstract. The nonlinear analysis became a common tool to precisely assess the load-bearing behavior of steel beam and column members. The failure level is significantly influenced by different types of imperfections, among geometric also structural imperfections (residual stresses). Here are still gaps in the knowledge. Nowadays, 3-D welding simulation developed to a level where it could provide reliable estimation of weld-induced distortion and residual stresses. Nevertheless, modelling and computational effort are still in a less practicable range. In this study a simplified procedure to implement residual welding stresses in continuous large scale members is proposed and the influence on the ultimate limit state of slender members in compression is evaluated for two common structural steel grades. The results showed significant improvements in the utilization of load bearing capacity compared with simplified design methods. The comparatively general approach in this study offers potential for future optimization. IntroductionWelded I-girders are used in different applications in steel construction (e.g. industrial buildings, bridges) due to either dimensions and/or efficiency through customizable plate thicknesses, shapes and/or materials. Many standards, including Eurocode 3 (EC 3) permit the use of non-linear finite element analysis (FEA) for the design of steel structures. The development in this field allows performing "experiments" in computing software instead of the laboratory or expensive in-situ experiments. Still, the implementation of imperfections (including residual stresses due to weld manufacturing) remains a major task in the performance of such analysis. Unlike geometrical imperfections, residual stresses (RS) are not standardized. For that reason, more or less founded simplified distribution functions as proposed by the Swedish design code BSK 99 [1] are used. Limitations on the applicability of this model are not reported except for the plate thicknesses which should not exceed 40 mm. However, the influence of RS seemed somewhat overestimated for many cases comparing conventional structural steel S355 and S690QL. As in the EC 3, direct proportionality of the tensile and compressive RS (the latter are the main interest in this study) and the yield strength is assumed. An opposite effect was recently noticed in [2,3] showing relatively reduced RS in high strength steel. A significant overestimation of RS was generally noticed if the chords are narrow. A lower limit is missing. Additionally, the correlation with the plate thicknesses only is doubted since no record is taken of actual welding parameters. Hence, a new approach was required. This contribution (as part of a national research project [2]) presents an improved general

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The Characteristics of the Source of Welding Residual Stress (Inherent Strain) and its Application to Measurement and Prediction

Cited by 6 publications

References 12 publications

Prediction of welding distortion in a curved plate structure by means of elastic finite element method

Prediction of welding distortion in a curved plate structure by means of elastic finite element method

05.03: Weld residual stresses effects in the design of welded plate girders: Simulation and Implementation

Residual Stress Influence on the Flexural Buckling of Welded I-Girders

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