Analytical prediction of springback in bending of tailor-welded blanks incorporating effect of anisotropy and weld zone properties

Gautam, Vijay; Raut, Vinayak Manohar; Kumar, Deepak

doi:10.1177/1464420715624261

Cited by 13 publications

(9 citation statements)

References 20 publications

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“…Ainda que se reforce apenas as regiões de maior solicitação mecânica, o acréscimo de massa ainda é prejudicial à eficiência energética do veículo. Uma das maneiras de conciliar então esses conceitos antagônicos (redução de massa × desempenho estrutural) é utilizar o processo de fabricação por Tailor Welded Blanks (TWBs), conforme apontam os estudos mais recentes [7][8][9][10][11][12][13].…”

Section: Introductionunclassified

Caracterização Mecânica e Análise Microestrutural de Chapas Obtidas pelo Processo de Tailor Welded Blank (TWB)

Andrade

2019

Soldag. insp.

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Resumo Um dos maiores desafios da indústria automobilística, a nível global, trata-se de desenvolver veículos que sejam, simultaneamente, leves e resistentes mecanicamente. O Tailor Welded Blank (TWB) surge como solução, pois é um processo que permite a soldagem de topo de chapas de diferentes especificações (material, espessura e/ou revestimento), antes da conformação. Nesta pesquisa trabalhou-se com chapas de aços livre de intersticiais (IF –Intertitial Free), da Companhia Siderúrgica Nacional (CSN), de códigos FEE 210 de 1,2 mm de espessura e IF CSN FEP 05 de 0,7 mm de espessura, soldadas a laser. Foram feitos ensaios de tração uniaxial e de microdureza Vickers. A linha de solda foi orientada de 0° a 70° (variando de 5° em 5°). A partir dos resultados obtidos espera-se que se possa consolidar uma metodologia para avaliação do melhor ângulo possível para a linha de solda de um TWB. Constatou-se que a carga máxima suportada aumenta à medida que se inclina a linha de solda (até um determinado limite) e que ângulos complementares de inclinação geram cargas cisalhantes similares. Deve-se trabalhar então com ângulos que permitam otimização de resistência mecânica, melhor conformabilidade e maior redução de massa e de custos. A seleção desse ângulo ficará atrelada a questões de projeto e não mais a tentativas e erros.

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Section: Introductionunclassified

Caracterização Mecânica e Análise Microestrutural de Chapas Obtidas pelo Processo de Tailor Welded Blank (TWB)

Andrade

2019

Soldag. insp.

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“…The behavior presented by the rupture load pro le is consistent with that found by [19], which rea rms his theory that the maximum resistance of a TWB does not depend on the weld (as long as it is previously quali ed), and is more related to the materials that make up the plates that give rise to the blank. This goes against what is advocated by [14,21,22].…”

Section: Tensile Testsmentioning

confidence: 71%

Influence of the Welding Angle on the Mechanical Behavior of Plates obtained by the Tailor Welded Blank (TWB) Process

WAd

et al. 2021

Preprint

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Tailor Welded Blank (TWB) is a top-welding technique (by unconventional processes) of sheets of different specifications (materials, thicknesses and/or coatings). Because it allows localised distribution of mechanical properties and mass, it can optimise the relationship between structural rigidity and total weight. The great challenge of this technique is to combine two processes with completely different demands, welding and mechanical forming. This work investigates the mechanical behavior of sheets obtained by the Tailor-blank process from the determination of the optimum angle. We performed tensile tests on sheets with different weld line inclinations, as the general objective is to consolidate knowledge about the process, characterise the conditions for sheet formation obtained by the technique, in a safe conformation range, with complex contours, dimensional qualities and free of catastrophic failure. Steel sheets, interstitial free (IF), of 1.10mm and 0.65mm thick were used. The TWB was applied with a welding line oriented from 0º to 90º (ranging from 15° to 15°). The optimum angle obtained was 30º, where there was a good relationship between the breaking load, purely tensile and shear stresses, and the total elongation. In relation to the angle of 0º, the optimum angle presented a superior elongation of approximately 40%. It was still possible to notice that the thickness of the plates influenced the optimum angle, even if the LSR (Limit Strength Ratio) is close.

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“…Furthermore, sometimes in U or V die bending, the final bend angle is smaller than the original one. 5 This bend angle is named spring-go. 6 To manufacture complicated U-shaped beams, channels, and frames with high precision, it is necessary to reduce the spring-back/spring-go.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, sometimes in U or V die bending, the final bend angle is smaller than the original one. 5 This bend angle is named spring-go. 6…”

Section: Introductionmentioning

confidence: 99%

Novel U-bending designed setups for investigating the spring-back/spring-go of two-layer aluminum/copper sheets through experimental tests and finite element simulations

Etemadi

Naseri

Valinezhad

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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This paper presents novel U-bending setups in order to investigate the effects of the curvatures created on the punch, die, or both on the spring-back/spring-go of the two-layer aluminum/copper sheets. Comparison of the new U-bending setups with the regular ones showed that the curvatures had important roles in reducing the spring-back/spring-go in the U-bending process. The results further indicated the good agreement between spring-back/spring-go and finite element simulations. Moreover, through finite element simulations, the effects of three effective parameters on reducing the spring-back/spring-go, including the curvature radius ( r) of the punch, the distance between curvature center and the fillet center ( d) in the punch, and the curvature radius at the end of the die ( R) were investigated. In achieving the desired state (90°), the results showed that the distance of curvature center from the fillet center ( d) was a more important parameter compared with the curvature radius at the end of the punch ( r) and the curvature radius at the end of the die ( R). This paper also focuses on the thicknesses of copper and aluminum as well as the stacking sequence of layers. Concerning the thicknesses of the implemented copper and aluminum change, the minimum angle of the spring-back/spring-go relative to the desired state was 75% Al/25% Cu thickness. Furthermore, the spring-back of aluminum/copper was lower than the copper/aluminum layer sheet. The effects of both thickness changing and stacking sequence of aluminum/copper layers on the spring-back/spring-go amounts of different sheets were due to the relocation of the neutral axis.

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Analytical prediction of springback in bending of tailor-welded blanks incorporating effect of anisotropy and weld zone properties

Cited by 13 publications

References 20 publications

Caracterização Mecânica e Análise Microestrutural de Chapas Obtidas pelo Processo de Tailor Welded Blank (TWB)

Caracterização Mecânica e Análise Microestrutural de Chapas Obtidas pelo Processo de Tailor Welded Blank (TWB)

Influence of the Welding Angle on the Mechanical Behavior of Plates obtained by the Tailor Welded Blank (TWB) Process

Novel U-bending designed setups for investigating the spring-back/spring-go of two-layer aluminum/copper sheets through experimental tests and finite element simulations

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