TAILIEUCHUNG - Forming limit curve determination of AA6061-T6 aluminum alloy sheet

In this paper, the FLC of the AA6061-T6 aluminum alloy sheet is predicted by using a micro-mechanistic constitutive model. The proposed constitutive model is implemented via a vectorized user-defined material subroutine (VUMAT) and integrated with finite element code in ABAQUS/Explicit software. | 51 TẠP CHÍ PHÁT TRIỂN KH&CN, TẬP 20, SỐ K2-2017 Forming limit curve determination of AA6061-T6 aluminum alloy sheet Nguyen Huu Hao, Nguyen Ngoc Trung, and Vu Cong Hoa Abstract—The forming limit curve (FLC) is used in sheet metal forming analysis to determine the critical strain or stress values at which the sheet metal is failing when it is under the plastic deformation process, . deep drawing process. In this paper, the FLC of the AA6061-T6 aluminum alloy sheet is predicted by using a micro-mechanistic constitutive model. The proposed constitutive model is implemented via a vectorized user-defined material subroutine (VUMAT) and integrated with finite element code in ABAQUS/Explicit software. The mechanical behavior of AA6061-T6 sheet is determined by the tensile tests. The material parameters of damage model are identified based on semi-experience method. To archive the various strain states, the numerical simulation is conducted for the Nakajima test and then the inverse parabolic fit technique that based on ISO 124004-2:2008 standrad is used to extracted the limit strain values. The numerical results are compared with the those of MK, Hill and Swift analytical models. Index Terms—forming limit curve, void growth, Nakajima drawing, Dung model. 1 INTRODUCTION O ver many years, the aluminum alloy sheets was widely applied in automotive and civil industries because of their outstanding advantages in high strength and light weight. Therefore, it is necessary to accurately describe their forming behaviors at large strains. Manuscript Received on July 13th, 2016. Manuscript Revised December 06th, 2016. This research is funded by Vietnam National University Ho Chi Minh City (VNU-HCM) under grant number C2017-20-05. Nguyen Huu Hao author is with the Engineering Mechanics Department, Ho Chi Minh City University of Technology, VNU-HCM, Vietnam (e-mail: nguyenhuuhao@). Nguyen Ngoc Trung author is with School of Mechanical Engineering, 585 Purdue .

• Cơ khí - Chế tạo máy
• Science and technology development
• Forming limit curve determination
• AA6061 T6 aluminum alloy sheet
• User defined material subroutine
• ABAQUS Explicit software
• Micro mechanistic constitutive model
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