Development of a new failure prediction criterion in sheet metal forming

Werber, Alexandra; Liewald, Mathias; Nester, Winfried; Grünbaum, Martin; Wiegand, Klaus; Simon, Jörg; Timm, Jürgen; Hotz, Walter

doi:10.1007/s12289-013-1134-y

Cited by 17 publications

(11 citation statements)

References 16 publications

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“…Nonetheless, the experiment forming limit stress curves in the biaxial state of stress located higher than the forming limit stress curve based on the Marciniak–Kuczinsky model grows quite exaggerated. The developed limit stress curves based on experimental forming limit curve data could more realistic describe stress behavior than the one based on Marciniak–Kuczinsky model approach and anisotropic yield function also significantly showed high efficiency in the forming limits [39, 40].…”

Section: Resultsmentioning

confidence: 99%

Formability prediction of high‐strength steel sheet using experimental, analytical and theoretical analysis based on strain and stress forming limit curves and its application to automotive forming parts

Nakwattanaset,

Panich,

Suranuntchai

2023

Materialwissenschaft Werkst

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In this work, the high‐strength steel (HSS) sheet dual‐phase 440 (DP440) were conducted to establish the forming limit curve (FLC) and analytical forming limit stress curve (FLSC) obtained from experimental forming limit curve. First, the Nakajima stretch forming examination was carried out to obtain forming limit curve of investigated sheet. Afterwards, the theoretical Marciniak–Kuczinsky (M–K) model was developed and calculated to evaluate localized necking limits both in strain and stress spaces combination with anisotropic yield criteria. Then, the analytical forming limit stress curves were plastically calculated by using experimental forming limit curve data combination with Swift hardening model and anisotropic yield criteria namely, Hill’48 and Yld2000‐2d for representing anisotropic plastic deformation behavior on examined steel sheet. Finally, automotive stamping parts were performed in order to verify an applicability of all developed curves. It was observed that the analytical forming limit stress curves could more precisely predict the formability of automotive parts better than the forming limit curve based on strain. Particularly, the one based on Yld2000‐2d predict better than the one based on Hill’48. Simultaneously, the experimental forming limit curve and analytical forming limit stress curve were also evaluated comparing with the theoretical calculated forming limit curve and forming limit stress curve using the Marciniak–Kuczinsky model. It should be noted again that the experimental forming limit curve and analytical forming limit stress curve are the best one. Therefore, the Yld2000‐2d yield function better represented the anisotropic behavior of the high‐strength steel sheet dual‐phase 440 than Hill′ 48 yield function, and can suitable be used for the analysis prediction and design of bumper automotive parts under forming processes.

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Section: Resultsmentioning

confidence: 99%

Formability prediction of high‐strength steel sheet using experimental, analytical and theoretical analysis based on strain and stress forming limit curves and its application to automotive forming parts

Nakwattanaset,

Panich,

Suranuntchai

2023

Materialwissenschaft Werkst

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“…With the development of subsequent theory and experiments, machining limits of various defects of sheet metal have a more accurate range. [7][8][9][10][11][12] Guo et al 13 compared the machining limit curves predicted by M-K model and Lou 2 Huh criterion through experiments, and the results showed that the accuracy of Lou 2 Huh criterion was higher. As the demand for complex structural parts increased, the research on forming defects and machining limits has become more diversified.…”

Section: Introductionmentioning

confidence: 99%

Study on the effect of multi-point stretch-bending processing conditions on the section distortion of complex cross-sectional parts

Liang

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Section distortion is a common defect in plastic forming, however, excessive section distortion will affect the actual use of the workpiece. In this paper, the finite element software ABAQUS is used to simulate the multi-point flexible stretch-bending process. Processing parameters are important factors in the forming process of the profile, so this paper discusses the effects of three processing parameters, namely the effects of pre-stretching amount, pro-stretching amount and friction coefficient on section distortion under different bending radius, taking the complex cross-sectional T-profile as an example. And the validity of the simulation results is verified by comparing with the experimental results and the simulation results. At the same time, the upper limit value of section distortion is given according to the actual assembly and use of aluminium profile components of high-speed train head frame, and the minimum bending radius (i.e., processing limit) for which the section distortion does not exceed the given value under different process parameters is explored and used for practical production guidance.

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“…e results show that this criterion can be used to predict the ductile fracture of bulk metal forming process. Based on the experimental observation, Werber et al [21] proposed a failure prediction criterion for the sheet forming process and described the failure surface accordingly. However, in the actual forming process, the actual effect of this failure prediction criterion needs to be evaluated.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Rolling Force for Extra-Thick Plate with CA Criterion

Zhang

Deng

2020

Mathematical Problems in Engineering

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In order to solve the nonlinear integral difficulty of the Mises yield criterion, a linear yield criterion, called the collaborative approximation (CA) yield criterion, is proposed by the collaborative control method. According to the approximation method, the mathematical expression of the CA yield criterion is derived as a linear function of the three principal stresses. The theoretical results based on the yield criterion in the form of the Lode parameter are verified with the classical test data, and a good agreement is found. Meanwhile, for the purpose of proving the effectiveness of the yield criterion, its specific plastic power is derived and applied to establish the rolling force model of an extra-thick plate. In the modeling, the internal power of plastic deformation is obtained by using the derived specific plastic power, while the shear power dissipation and the frictional power dissipation are obtained by using the methods of strain vector inner product and average velocity integration. Then, the analytical solution of the rolling force is obtained and then extended to the one accounting for the temperature rise. The maximum errors of the predicted rolling torque and rolling force without considering the temperature rise are 12.72% and 11.78%, respectively, while those considering the temperature rise decrease to 3.54% and 5.23%, respectively. Moreover, the influence of relative reduction, friction factor, surface temperature, and the temperature rise of the workpiece on the theoretical results is discussed.

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Development of a new failure prediction criterion in sheet metal forming

Cited by 17 publications

References 16 publications

Formability prediction of high‐strength steel sheet using experimental, analytical and theoretical analysis based on strain and stress forming limit curves and its application to automotive forming parts

Formability prediction of high‐strength steel sheet using experimental, analytical and theoretical analysis based on strain and stress forming limit curves and its application to automotive forming parts

Study on the effect of multi-point stretch-bending processing conditions on the section distortion of complex cross-sectional parts

Analysis of Rolling Force for Extra-Thick Plate with CA Criterion

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