Forming characteristic of sheet hydroforming under the influence of through-thickness normal stress

Liu, Baosheng; Li, Lihui; Zeng, Yiming; Lin, Jianguo

doi:10.1016/j.jmatprotec.2012.03.021

Cited by 30 publications

(12 citation statements)

References 17 publications

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“…By substituting Equation (39) into Equation (14) and integrating, the radial stress of the workpiece in Region A is:…”

Section: Analytical Modeling Applying the Bbc2005 Yield Criterionmentioning

confidence: 99%

“…Hence, the finite element method (FEM) has become an indispensable analysis tool in the manufacturing processes design. Liu et al [14] proposed an analytical approach to obtain a proper prediction of liquid pressure for the hydroforming of a curved surface shell by the combination of numerical simulation and theoretical models. Moreover, the effects of different parameters for the proper liquid pressure were discussed using multiple linear regression analysis.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Anisotropic Yield Functions on Prediction of Critical Process Window and Deformation Behavior for Hydrodynamic Deep Drawing of Aluminum Alloys

Wang

Meng

et al. 2020

Metals

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Owing to the reduction of rupture instability and the avoidance of wrinkle defect, the hydrodynamic deep drawing (HDD) process is gradually becoming attractive for fabricating lightweight and complicated products. Meanwhile, since metallic materials present anisotropic deformation behavior, it is necessary to select an appropriate constitutive model for the prediction of plastic deformation behavior of applied material with high precision. In the present research, several anisotropic yield criteria, namely, Hill’48, Yld2000-2d, and BBC2005, were implemented to investigate the effects of yield functions on the prediction accuracy of the critical process window and deformation behavior for the HDD process of 2024 and 5754 aluminum alloys. Material constants in the yield criteria were determined by applying uniaxial and equi-biaxial tension tests and optimizing an error-function using the Levenberg–Marquardt algorithm. Furthermore, the process window diagram was computed utilizing the stress analytical model combined material properties with workpiece geometrical features. Numerical simulation results of predicted material anisotropic parameters, process window, and HDD deformation for aluminum alloys were compared with the experimental data. Through the comparison of diverse yield criteria based on materials’ anisotropic coefficients, critical process window prediction, earing profile, and thickness distribution, it was revealed that the Yld2000-2d and the BBC2005 yield criteria can offer more precise models of material behavior in planar anisotropy properties for the HDD process of 2024 and 5754 aluminum alloys.

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“…By substituting Equation (39) into Equation (14) and integrating, the radial stress of the workpiece in Region A is:…”

Section: Analytical Modeling Applying the Bbc2005 Yield Criterionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Anisotropic Yield Functions on Prediction of Critical Process Window and Deformation Behavior for Hydrodynamic Deep Drawing of Aluminum Alloys

Wang

Meng

et al. 2020

Metals

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show abstract

“…This innovative and flexible processing method combines the advantages of cold sheet hydroforming and warm/hot sheet forming [5][6][7] and is regarded as an advanced technique for improving material formability [8][9][10][11]. In contrast to the conventional sheet hot stamping process, fluid pressure provides the through-thickness normal stress and assists the sheet formation process during warm/hot sheet hydroforming [12,13]. Therefore, the stress states under the influence of fluid pressure are of great significance for elucidating the forming mechanism of this technique [14][15][16][17] and also play an important role in selection of processing method, parameter optimization, and determination of the rules governing deformation during forming [18,19].…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach to Predict Wrinkling of Aluminum Alloy During Warm/Hot Sheet Hydroforming Based on an Improved Yoshida Buckling Test

Cai

Zhang

et al. 2020

Materials

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In order to predict the wrinkling of sheet metal under the influence of fluid pressure and temperature during warm/hot hydroforming, a numerical simulation model for sheet wrinkling prediction was established, taking into account through-thickness normal stress induced by fluid pressure. From simulations using linear and quadratic elements, respectively, it was found that the latter gave results that were much closer to experimental data. A novel experimental method based on an improved Yoshida Buckling Test (YBT) was proposed for testing the wrinkling properties of sheets under the through-thickness normal stress. A wrinkling coefficient suitable for predicting wrinkling was also presented. Based on the numerical simulations, an experimental validation of wrinkling performance was conducted. Ridge-height curves measured along the main diagonal tensile direction of the sheet were presented and showed that the wrinkling prediction criterion provided good discrimination. Furthermore, the wrinkling properties of several different materials were simulated to evaluate the accuracy of the prediction method, and the results revealed that the improved YBT gave good predictions for wrinkling in the conventional sheet metal forming process, while the prediction results for wrinkling in warm/hot sheet hydroforming were also accurate with the fluid pressure of zero.

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“…As for the latter one, the relationship between order of total principle strain components and the associated principle stress components was deduced on the basis of Levy-Mises equation. This theory reveals the dramatic relationship between dimensional change of metal and the external forces added to the metal during deformation process and received its applications in qualitative and quantitative analysis [3,4].…”

Section: Introductionmentioning

confidence: 99%

A Consistent Relationship between the Stress and Plastic Strain Components and Its Application in Deep Drawing Process

Zhang

Qin

et al. 2017

Mathematical Problems in Engineering

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As von Mises yield criterion and associated flow rule (AFR) are widely applied in metal forming field, a semitotal deformation consistent relationship between the stress and plastic strain components and the rule of dimensional changes of metal forming processes in a plane-stress state are obtained on the basis of them in this paper. The deduced consistent relationship may be easily used in forming interval of the workpiece. And the rule of dimensional changes can be understood through three plastic strain incremental circles on which the critical points can be easily determined on the same basis. Analysis of stress and plastic strain evolution of aluminum warm deep drawing process is conducted, and the advantage of nonisothermal warm forming process is revealed, indicating that this method has the potential in practical large deformation applications.

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Forming characteristic of sheet hydroforming under the influence of through-thickness normal stress

Cited by 30 publications

References 17 publications

Effect of Anisotropic Yield Functions on Prediction of Critical Process Window and Deformation Behavior for Hydrodynamic Deep Drawing of Aluminum Alloys

Effect of Anisotropic Yield Functions on Prediction of Critical Process Window and Deformation Behavior for Hydrodynamic Deep Drawing of Aluminum Alloys

A Novel Approach to Predict Wrinkling of Aluminum Alloy During Warm/Hot Sheet Hydroforming Based on an Improved Yoshida Buckling Test

A Consistent Relationship between the Stress and Plastic Strain Components and Its Application in Deep Drawing Process

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