scholarly journals Anisotropic yield function of aluminum alloy sheet for accurate press forming simulation

2015 ◽  
Vol 65 (11) ◽  
pp. 536-541
Author(s):  
Hiroshi Hamasaki
Keyword(s):  
Aluminum Alloy ◽  
Yield Function ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Forming Simulation ◽  
Press Forming ◽  
Anisotropic Yield Function

Springback Analysis of Aluminum Alloy Sheet Metals by Yoshida-Uemori Model

2016 ◽  
Vol 725 ◽  
pp. 566-571 ◽  
Author(s):  
Takeshi Uemori ◽  
Kento Fujii ◽  
Toshiya Nakata ◽  
Shinobu Narita ◽  
Naoya Tada ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Sheet Metal ◽  
Kinematic Hardening ◽  
Yield Function ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Sheet Metals ◽  
Initial Anisotropy ◽  
Hardening Rules ◽  
Prediction Capability

During the last few decades, the enhancement of prediction capability of the sheet metal forming have been increasing dramatically. High accurate yield criteria and wokhardening model (especially, non-linear kinematic hardening model) have a great importance for the prediction of the final shapes of sheet metal. However, the predicted springback accuracy of aluminum alloy sheet metal is not still good due to their complicated plastic deformation behaviors.In the present research, the springback deformation of aluminum alloy sheet metals were investigated by finite element calculation with consideration of initial anisotropy and the Bauschinger effect. In order to examine the effect of the initial and deformation induced anisotropy on the springback deformation, several types of high accurate yield function and hardening rules are utilized in the present research. The calculated springback by Yoshida 6th yield function [1] and Yoshida-Uemori model [2] shows an excellent agreement with the corresponding experimental data, while the other models underestimate the springback.

scholarly journals Prediction of Eight Earings in Deep Drawing of 5754O Aluminum Alloy Sheet

2019 ◽  
Vol 32 (1) ◽  
Author(s):  
Haibo Wang ◽  
Mingliang Men ◽  
Yu Yan ◽  
Min Wan ◽  
Qiang Li
Keyword(s):  
Aluminum Alloy ◽  
Yield Stress ◽  
Deep Drawing ◽  
Yield Function ◽  
Alloy Sheet ◽  
Drawing Process ◽  
Aluminum Alloy Sheet ◽  
Deep Drawing Process ◽  
Anisotropy Index ◽  
Deformation Area

Abstract Earings appear easily during deep drawing of cylindrical parts owing to the anisotropic properties of materials. However, current methods cannot fully utilize the mechanical properties of material, and the number of earings obtained differ with the simulation methods. In order to predict the eight-earing problem in the cylindrical deep drawing of 5754O aluminum alloy sheet, a new method of combining the yield stress and anisotropy index (r-value) to solve the parameters of the Hill48 yield function is proposed. The general formula for the yield stress and r-value in any direction is presented. Taking a 5754O aluminum alloy sheet as an example in this study, the deformation area in deep drawing is divided into several equal sectorial regions based on the anisotropy. The parameters of the Hill48 yield function are solved based on the yield stress and r-value simultaneously for the corresponding deformation area. Finite element simulations of deep drawing based on new and existing methods are carried out for comparison with experimental results. This study provides a convenient and reliable way to predict the formation of eight earings in the deep drawing process, which is expected to be useful in industrial applications. The results of this study lay the foundation for the optimization of the cylindrical deep drawing process, including the optimization of the blank shape to eliminate earing defects on the final product, which is of great importance in the actual production process.

scholarly journals Friction characteristics in press forming of 5000 series aluminum alloy sheet

2015 ◽  
Vol 65 (11) ◽  
pp. 573-577
Author(s):  
Shinichi Nishida ◽  
Ryosuke Kurihara ◽  
Ryosuke Okushima ◽  
Hayato Aso ◽  
Yoshitaka Sato ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Friction Characteristics ◽  
Press Forming ◽  
Series Aluminum Alloy
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