Spring-back evaluation of automotive sheets based on isotropic-kinematic hardening laws and non-quadratic anisotropic yield functions

Lee, Myoung‐Gyu; Kim, Dae-Yong; Kim, Chongmin; Wenner, Michael L.; Wagoner, R. H.; Chung, Kwansoo

doi:10.1016/j.ijplas.2004.05.015

Cited by 44 publications

(53 citation statements)

References 27 publications

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“…Lee et al [4] performed a springback evaluation of automotive sheets based on an isotropic-kinematic hardening model and anisotropic yield functions. In addition, Zang et al [5] and Larsson et al [6] employed a combined isotropic-kinematic hardening model to evaluate springback effects in steel sheets.…”

Section: Of 13mentioning

confidence: 99%

Effect of Constitutive Equations on Prediction Accuracy for Springback in Cold Stamping of TRIP1180

Seo¹,

Kim²,

Lee³

et al. 2017

Preprint

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Abstract:The objective of this study is to evaluate the effect of constitutive equations on the prediction accuracy for springback in cold stamping with various deformation modes. In this study, two types of yield functions-Hill'48 and Yld2000-2d-were considered to describe yield behavior. Isotropic and kinematic hardening models based on the Yoshida-Uemori model were also adopted to describe hardening behavior. Various material tests (such as uniaxial tension, tension-compression, loading-unloading, and hydraulic bulging tests) were carried out to determine the material parameters of the models. The obtained parameters were implemented in the finite element (FE) simulation to predict springback, and the results were compared with experimental data. U-bending and T-shape drawing were employed to evaluate the springback prediction accuracy. Obviously, the springback prediction accuracy was greatly influenced by constitutive equations. Therefore, it is important to choose appropriate constitutive equations for accurate description of material behaviors in FE simulation.

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Section: Of 13mentioning

confidence: 99%

Effect of Constitutive Equations on Prediction Accuracy for Springback in Cold Stamping of TRIP1180

Seo¹,

Kim²,

Lee³

et al. 2017

Preprint

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“…Y-U model successfully describes such characteristics of cyclic stress-strain responses. Note that works on cyclic plasticity modeling for aluminum sheets based on the experimental data, which are of importance for numerical simulation of multi-stage sheet metal forming, are still very limited, although there are some discussions on the Bauschinger effect in reverse deformations (e.g., Lee et al 23) ).…”

Section: Cyclic Tension-compressionmentioning

confidence: 99%

Experimental Observation of Elasto-Plasticity Behavior of Type 5000 and 6000 Aluminum Alloy Sheets

et al. 2011

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Elasto-plasticity behavior of type A5052-O and AA6016-T4 aluminum alloy sheets was examined by performing several experiments of uniaxial tension, biaxial stretching and in-plane cyclic tension-compression. Both sheets exhibit apparent r-value planar anisotropy, especially for AA6016-T4 it is extremely strong, while their flow stress directionality under uniaxial tension is not so significant. Both the sheets show strong cyclic hardening with weak Bauschinger effect. Such material behavior is well described by Yoshida-Uemori kinematic hardening model combined with an appropriate choice of anisotropic yield function.

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“…M G Lee proposed a method to analyze the problem of spring-back for one-dimensional bending, and analyzed the spring-back of bending, stretching and bending, multiple bending process [4]; K Chung modified Chaboche hardening model, proposed a new mixed hardening model to improve the accuracy of spring-back [5][6]; M Bozdemir applied artificial neural network method to control the spring-back and optimized their parameters of the hardening model. For a V shaped part in his studying model, using the bending radius and bending angle to predict the spring-back, then the spring-back angle was optimized [7].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Plate Forming Process and its Spring-Back of Plate Type Heat Exchanger Based on DYNAFORM

Wang¹,

Hu²,

Su³

2017

dtetr

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Abstract. The amount of spring-back of plate produced after stamping is one of the factors affect the assembling quality of the plate type heat exchanger (PTHE), which affect sealing property of the exchanger and the heat exchanging efficiency. The forming process of plate and the spring-back of PTHE plate were designed to be studied based on DYNAFORM software. The results of simulation and calculation showed that the maximum thinning rate is 30% and thickening rate 8% in some small region, and the maximum spring-back amount of the whole plate is less than 0.9°. It is also shown that the maximum spring-back lies in the position near the edge of plate, and in the chosen eight locations, they are 0.78°, 0.26°, 0.39°, 0.42°, 0.16°, 0.30°, 0.17° and 0.16° respectively with good PTHE assembly quality.

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Spring-back evaluation of automotive sheets based on isotropic-kinematic hardening laws and non-quadratic anisotropic yield functions

Cited by 44 publications

References 27 publications

Effect of Constitutive Equations on Prediction Accuracy for Springback in Cold Stamping of TRIP1180

Effect of Constitutive Equations on Prediction Accuracy for Springback in Cold Stamping of TRIP1180

Experimental Observation of Elasto-Plasticity Behavior of Type 5000 and 6000 Aluminum Alloy Sheets

Simulation of Plate Forming Process and its Spring-Back of Plate Type Heat Exchanger Based on DYNAFORM

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