Time-dependent springback of advanced high strength steels

Lim, Hojun; Lee, M.G.; Sung, Ji Hyun; Kim, J.H.; Wagoner, R. H.

doi:10.1016/j.ijplas.2011.07.008

Cited by 70 publications

(25 citation statements)

References 34 publications

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“…in multiphase TRIP steels Lim et al, 2012) and metastable austenitic grades (Lindgren et al, 2010;Kubler et al, 2011). These two alloys are frequently used by the industry for energy absorption in crash (Rodrí-guez-Martínez et al, 2010b;Andersson, 2005) or blast protection applications Schleyer, 2005a,b, 2006) due to their ductility and work hardening ability.…”

Section: Introductionmentioning

confidence: 99%

On the Taylor–Quinney coefficient in dynamically phase transforming materials. Application to 304 stainless steel

Zaera

Rodríguez-Martínez

Rittel

2013

International Journal of Plasticity

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a b s t r a c tWe present a thermodynamic scheme to capture the variability of the Taylor-Quinney coefficient in austenitic steels showing strain induced martensitic transformation at high strain rates. For that task, the constitutive description due to Zaera et al. (2012) has been extended to account for the heat sources involved in the temperature increase of the material. These are the latent heat released due to the exothermic character of the transformation and the heat dissipated due to austenite and martensite straining. Through a differential treatment of these dissipative terms, the Taylor-Quinney coefficient develops a direct connection with the martensitic transformation becoming stress, strain and strain rate dependent. The improved constitutive description sheds light on experimental results available in the literature reporting unusual ð> 1Þ values for the Taylor-Quinney coefficient.

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Section: Introductionmentioning

confidence: 99%

On the Taylor–Quinney coefficient in dynamically phase transforming materials. Application to 304 stainless steel

Zaera

Rodríguez-Martínez

Rittel

2013

International Journal of Plasticity

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“…The other material properties are given in Table 1, where E, σ u and ν denote, respectively, the Young modulus, ultimate tensile stress, and the Poisson's ratio. To define the accuracy of the friction coefficient, as per past research [4,8,19], the contact surface model, defined by Coulomb friction law, was applied. By comparing the FEM simulation results obtained from each friction coefficient (0.08, 0.10 and 0.12) with the experimental results, the contact interfaces between the sheet and the tool, defined with a friction coefficient value of 0.10, were in good agreement, which corresponded well with the literature [10,13,14,16].…”

Section: Fem Simulation Modelmentioning

confidence: 99%

“…Various geometry and process parameters, including bend angle, material thickness, tool radius, and material properties, result in processing difficulties in the control of the spring-back feature. Therefore, the bending process has also been developed using different methods to achieve precision bent parts [1][2][3][4][5][6][7]. Zong et al [1] studied spring-back evaluation in hot v-bending of Ti-6Al-4V alloy sheets.…”

Section: Introductionmentioning

confidence: 99%

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Design of U-Geometry Parameters Using Statistical Analysis Techniques in the U-Bending Process

Phanitwong

Boochakul

Thipprakmas

2017

Metals

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Abstract:The various U-geometry parameters in the U-bending process result in processing difficulties in the control of the spring-back characteristic. In this study, the effects of U-geometry parameters, including channel width, bend angle, material thickness, tool radius, as well as workpiece length, and their design, were investigated using a combination of finite element method (FEM) simulation, and statistical analysis techniques. Based on stress distribution analyses, the FEM simulation results clearly identified the different bending mechanisms and effects of U-geometry parameters on the spring-back characteristic in the U-bending process, with and without pressure pads. The statistical analyses elucidated that the bend angle and channel width have a major influence in cases with and without pressure pads, respectively. The experiments were carried out to validate the FEM simulation results. Additionally, the FEM simulation results were in agreement with the experimental results, in terms of the bending forces and bending angles.

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“…Springback is a phenomenon in which the metal strip unbends itself after a forming operation. Control of springback for the bending processes applied in practice is difficult for a number of reasons, especially in mass production [2,[9][10][11][12][13][14][15]. In the case of tailor-welded strips the quality of the weld is critical for a successful forming operation [16,17] and affected springback phenomenon [18,19].…”

Section: Introductionmentioning

confidence: 99%

Springback Characteristics of the Tailor-Welded 18g2a-E355 Steel Strips

Froń¹,

Stachowicz²

2013

Acta Metall Slovaca

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Recently many industry companies are trying to form different products by using tailor-welded blanks. A tailor-welded blank consists of two or more sheets that have been welded together in a single plane prior to forming. And the sheets joined by welding can be identical, or they can have different thickness, mechanical properties or surface coatings. Various welding processes, i.e. laser welding, mash welding, electron-beam welding or induction welding, can join them. Many studies presented a wide range of information about the formability and failure patterns of tailor-welded blanks and the springback of non-welded sheet metal parts. However, accurate prediction of the springback remains elusive, especially in the case of thick sheet metal. The purpose of this study was to predict the springback of the tailor-welded 18G2A-E355 steel strips. Especially, it was focused on comparing the differences of the mechanical properties and springback between the tailor-welded strips and non-welded ones under the same experimental conditions. The set-up mounted on the testing machine, instrumentation and process control system allows the rig to operate in displacement as well as load control. The MAG method with the Argon + CO 2 atmosphere was used for strips welding.

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Time-dependent springback of advanced high strength steels

Cited by 70 publications

References 34 publications

On the Taylor–Quinney coefficient in dynamically phase transforming materials. Application to 304 stainless steel

On the Taylor–Quinney coefficient in dynamically phase transforming materials. Application to 304 stainless steel

Design of U-Geometry Parameters Using Statistical Analysis Techniques in the U-Bending Process

Springback Characteristics of the Tailor-Welded 18g2a-E355 Steel Strips

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