[논문]Strength modeling of sheet metals from shear to plane strain tension

Lou, Yanshan; Zhang, Saijun; Yoon, Jeong Whan

doi:10.1016/j.ijplas.2020.102813

[해외논문] Strength modeling of sheet metals from shear to plane strain tension

International journal of plasticity, v.134, 2020년, pp.102813 -

Lou, Yanshan (School of Mechanical Engineering, Xi'an Jiao Tong University) , Zhang, Saijun (Guangdong Provincial Key Laboratory of Precision Equipment and Manufacturing Technology, School of Mechanical and Automotive Engineering, South China University of Technology) , Yoon, Jeong Whan (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST))

Abstract ▼ AI-Helper

Abstract This paper proposes a yield function to model sheet metal strength between shear and plane strain tension. The function is expressed as an equation of the three stress invariants to take into account the pressure sensitivity, the Lode dependence and the strength-differential effect on material strength. To validate the accuracy of the formulated yield function, experiments are conducted with the designed specimens to characterize the mechanical behavior of AA7075 and QP980 sheet between shear and plane strain tension. The yield function and the combined Swift-Voce hardening law are iteratively calibrated by using an inverse experimental-numerical scheme. The calibrated constitutive equations are utilized to numerically predict the load-stroke responses of different tests. The numerical prediction demonstrates that the proposed yield function calibrated by the inverse engineering approach can accurately describe the material strength in various loading conditions from the onset of yielding to ultimate rupture. Accordingly, the proposed yield function is recommended to model material strength under various loading conditions, and the inverse engineering approach is suggested for the calibration of its parameters. Highlights It has been proposed a new yield function to model sheet metal strength between shear and plane strain tension. It is of three stress invariants to consider pressure sensitivity, Lode dependence and strength-differential effect. Validation experiments are conducted with the designed specimens for AA7075 and QP980 from shear to plane strain tension. New equation calibrated by inverse engineering method precisely models metal strength in various stress states until rupture.

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