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Open AccessArticle

Effects of Hardening Model and Variation of Elastic Modulus on Springback Prediction in Roll Forming

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‏Mechanical Engineering faculty, Tarbiat Modares University, Tehran 14115-111, Iran
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Engineering faculty, Tafresh University, Tafresh 39518-79611, Iran
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(9), 1005; https://doi.org/10.3390/met9091005
Received: 19 July 2019 / Revised: 27 August 2019 / Accepted: 5 September 2019 / Published: 12 September 2019
In this paper, the uniaxial loading–unloading–reloading (LUR) tensile test was conducted to determine the elastic modulus depending on the plastic pre-strain. To obtain the material parameters and parameter of Yoshida-Uemori’s kinematic hardening models, tension–compression experiments were carried out. The experimental results of the cyclic loading tests together with the numerically predicted response of the plastic behavior were utilized to determine the parameters using the Ls-opt optimization tool. The springback phenomenon is a critical issue in industrial sheet metal forming processes, which could affect the quality of the product. Therefore, it is necessary to represent a method to predict the springback. To achieve this aim, the calibrated plasticity models based on appropriate tests (cyclic loading) were implemented in commercial finite element (FE) code Ls-dyna to predict the springback in the roll forming process. Moreover, appropriate experimental tests were performed to validate the numerical results, which were obtained by the proposed model. The results showed that the hardening models and the variation of elastic modulus have significant impact on springback accuracy. The Yoshida-Uemori’s hardening represents more accurate prediction of the springback during the roll forming process when compared to isotropic hardening. Using the chord modulus to determine the reduction in elastic modulus gave more accurate results to predict springback when compared with the unloading and loading modulus to both hardening models. View Full-Text
Keywords: roll forming; springback; hardening model; Yoshida-Uemori’s kinematic roll forming; springback; hardening model; Yoshida-Uemori’s kinematic
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MDPI and ACS Style

Naofal, J.; Naeini, H.M.; Mazdak, S. Effects of Hardening Model and Variation of Elastic Modulus on Springback Prediction in Roll Forming. Metals 2019, 9, 1005.

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