Numerical study on variation of chord modulus on the springback of high-strength steels

Lajarin, Sérgio Fernando; Filho, Ravilson Antonio Chemin; Rebeyka, Claudimir José; Nikhare, Chetan P.; Marcondes, Paulo Victor Prestes

doi:10.1007/s00170-020-04975-x

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…• deduction from the linear regression on unloading path between the points A (maximal stress at the begin of the loop) and B (minimal stress of loop) (red curve in figure 1b) [4]. • chord slope (segment [DB]) (black dotted curve in figure 1b) [5].…”

Section: Several Definitions and Identificationmentioning

confidence: 99%

Impact of elastic modulus evolution on springback prediction

Lemoine

Devin

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Today, the hardening Yoshida-Uemori model is implemented in the most used FEA stamping codes (Autoform®, Pamstamp®, LS-Dyna®…) with occasionally some variations. This forming material card is requested regularly by the car manufacturers. The Yoshida-Uemori model is a combined hardening model coupled with the elastic evolution modulus which depends on the equivalent plastic strain. According to the experimental tests conducted and their identification protocol, the set of parameters improves the springback prediction compared to the prediction with a purely isotropic hardening model. The numerical analysis shows that the elastic modulus evolution has an influence on springback prediction of the same order as the combined hardening (isotropic and kinematic). The adjusting parameters governing the evolution of the elastic modulus are identified thanks to hysteresis loops conducted between 0.2% of plastic deformation and uniform elongation (Uel). For each loop, there are several ways to define an unloading elastic module: the chord of loop; the slope deducted from the linear regression on unloading path on a range. According to the choice of range, the value differs. What is the impact of these choices on the springback prediction of a stamped part?

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Section: Several Definitions and Identificationmentioning

confidence: 99%

Impact of elastic modulus evolution on springback prediction

Lemoine

Devin

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The Chord Modulus Approach [31] (shown in Equation ( 3)) is employed and the result shows that Young's modulus of DP980 reduces nonlinearly with the increased plastic deformation. More details can be obtained in [32].…”

Section: Fea Model Of Rf Processmentioning

confidence: 99%

The precise control of end flare with residual stresses of UHSS thin-walled component in roll forming process

Cheng

Cao

Wei

et al. 2023

Ironmaking & Steelmaking

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To control precisely end flare of UHSS thin-walled component, FEA (finite element analysis) model of multi-pass RF (roll forming) process is established. Numerical simulations with developed FEA model considered Young's modulus variation and RF tests are conducted to explain the origin of end flare with residual stresses. It's found that the overlap of bending moment caused by residual longitudinal stress and twisting moment caused by residual shear stress in transversal-longitudinal direction leads to opening deformation in front end and back end for hat channel steel. End flare will decrease with the increase of flange length and increase with the increase of material strength. The effect of forming parameters on end flare is analysed that end flare can be reduced with UDTtype (USTB-Durable T) method, constant-arc-length method and appropriate forming parameters. The findings are applied to control end flare of hat channel steel in actual RF process to meet highprecision requirements.

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Influence of Yoshida-Uemori Model on Springback Prediction

Lemoine,

Devin

2024

The Minerals, Metals &Amp; Materials Series

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Numerical study on variation of chord modulus on the springback of high-strength steels

Cited by 6 publications

References 7 publications

Impact of elastic modulus evolution on springback prediction

Impact of elastic modulus evolution on springback prediction

The precise control of end flare with residual stresses of UHSS thin-walled component in roll forming process

Influence of Yoshida-Uemori Model on Springback Prediction

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