Experimental and theoretical investigations of the forming limit of 5754O aluminum alloy sheet under different combined loading paths

2017 ◽  
Vol 133 ◽  
pp. 147-166 ◽  
Author(s):  
Haibo Wang ◽  
Yu Yan ◽  
Fei Han ◽  
Min Wan
Keyword(s):  
Aluminum Alloy ◽  
Alloy Sheet ◽  
Combined Loading ◽  
Forming Limit ◽  
Aluminum Alloy Sheet ◽  
Loading Paths ◽  
Theoretical Investigations

scholarly journals Forming Limit Research of 5182 Aluminum Alloy Sheet Based on Lou-2013 Ductile Fracture Criterion

2019 ◽  
Vol 55 (16) ◽  
pp. 47 ◽  
Author(s):  
YANG Zhuoyun ◽  
ZHAO Changcai ◽  
DONG Guojiang ◽  
CHEN Guang ◽  
ZHU Liangjin ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Ductile Fracture ◽  
Fracture Criterion ◽  
Alloy Sheet ◽  
Forming Limit ◽  
Aluminum Alloy Sheet ◽  
Ductile Fracture Criterion

scholarly journals Aluminum Alloy Sheet-Forming Limit Curve Prediction Based on Original Measured Stress–Strain Data and Its Application in Stretch-Forming Process

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1129 ◽  
Author(s):  
Lirong Sun ◽  
Zhongyi Cai ◽  
Dongye He ◽  
Li Li
Keyword(s):  
Aluminum Alloy ◽  
Alloy Sheet ◽  
Forming Limit ◽  
Aluminum Alloy Sheet ◽  
Limit Curve ◽  
Forming Process ◽  
Forming Limit Curve ◽  
Stress Strain ◽  
Strain Relation ◽  
Stress Strain Relation

A new method, by directly utilizing original measured data (OMD) of the stress–strain relation in the Marciniak–Kuczynski (M–K) model, was proposed to predict the forming limit curve (FLC) of an aluminum alloy sheet. In the groove zone of the M–K model, by establishing the relations of the equivalent strain increment, the ratio of shear stress to the first principle stress and the ratio of the second principle stress to the first principle stress, the iterative formula was established and solved. The equations of theoretical forming limits were derived in detail by using the OMD of the stress–strain relation. The stretching specimens of aluminum alloy 6016-T4 were tested and the true stress–strain curve of the material was obtained. Based on the numerical simulations of punch-stretch tests, the optimized specimens’ shape and test scheme were determined, and the tests for FLC were carried out. The FLC predicted by the proposed method was more consistent with the experimental results of FLC by comparing the theoretical FLCs based on OMD of the stress–strain relation and of that based on traditional power function. In addition, the influences of anisotropic parameter and groove angle on FLCs were analyzed. Finally, the FLC calculated by the proposed method was applied to analyze sheet formability in the stretch-forming process, and the predicted results of FLC were verified by numerical simulations and experiments. The fracture tendency of the formed parts can be visualized in the forming limit diagram (FLD), which has certain guiding significance for fracture judgment in the sheet-forming process.

scholarly journals Material Modeling in High Strain Range and Forming Limit Analysis for 6000 Series Aluminum Alloy Sheet

2020 ◽  
Vol 47 ◽  
pp. 1270-1273
Author(s):  
Yu Ogasawara ◽  
Tomoyuki Hakoyama ◽  
Toshihiko Kuwabara ◽  
Hiroaki Hayamizu ◽  
Takeshi Ikeda ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Limit Analysis ◽  
High Strain ◽  
Strain Range ◽  
Alloy Sheet ◽  
Material Modeling ◽  
Forming Limit ◽  
Aluminum Alloy Sheet ◽  
Series Aluminum Alloy

scholarly journals Forming limit curve determination of AA6061-T6 aluminum alloy sheet

2017 ◽  
Vol 20 (K2) ◽  
pp. 51-60
Author(s):  
Hao Huu Nguyen ◽  
Trung Ngoc Nguyen ◽  
Trung Ngoc Nguyen ◽  
Hoa Cong Vu
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Model ◽  
Sheet Metal ◽  
Damage Model ◽  
Alloy Sheet ◽  
Analytical Models ◽  
Forming Limit ◽  
Aluminum Alloy Sheet ◽  
Limit Curve ◽  
Forming Limit Curve

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, e.g. 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.

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