Finite Element Modeling of Superplastic Sheet Metal Forming for Cavity Sensitive Materials

2003 ◽  
Vol 125 (3) ◽  
pp. 256-259 ◽  
Author(s):  
K. M. Liew ◽  
H. Tan ◽  
M. J. Tan
Keyword(s):  
Finite Element ◽  
Metal Forming ◽  
Present Model ◽  
Cavity Growth ◽  
Rate Sensitivity ◽  
Superplastic Forming ◽  
The Finite Element Method ◽  
Forming Process ◽  
Strain Limit ◽  
Microstructural Mechanism

In this paper, a constitutive equation for superplasticity, which is based on the microstructural mechanism of superplastic deformation taking into account the effects of deformation damage, is incorporated into the finite element method to simulate the superplastic forming process. The effects of strain rate sensitivity, cavity growth and imposed hydrostatic pressure on the strain limit are studied. The predicted results are validated through the comparison with the existing experimental data. It is found that the present model produces accurate results in all cases.

Position and the Size of Drawbeads for Sheet Metal Forming with the Finite Element Method

2014 ◽  
Vol 607 ◽  
pp. 112-117
Author(s):  
Khemajit Sena ◽  
Surasith Piyasin
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Drawing Process ◽  
The Finite Element Method ◽  
Forming Process ◽  
Deep Drawing Process ◽  
Metal Forming Process ◽  
Element Method

This study aims to find a solution to improve the formability in a deep drawing process. For this purpose drawbeads were used to avoid wrinkles and ruptures. The finite element method was applied to simulate the 3D metal forming process using a die and drawbead. The drawbead amount, position, size and form were studied for their affects on the formability. 3 drawbead patterns with 3 different heights were examined. The simulation was performed for each drawbead pattern and each drawbead geometrical parameter and the failure elements were counted. The best pattern chosen was the pattern that resulted in the least failure elements.

A Velocity Approach to Elasto-Plastic and Elasto-Viscoplastic Calculation by the Finite Element Method

1990 ◽  
Vol 112 (2) ◽  
pp. 150-154 ◽  
Author(s):  
J. L. Chenot ◽  
M. Bellet
Keyword(s):  
Finite Element ◽  
Metal Forming ◽  
Time Discretization ◽  
The Finite Element Method ◽  
Forming Process ◽  
Element Discretization ◽  
Numerical Tests ◽  
Metal Forming Process ◽  
Order Scheme ◽  
Complete Set

A second order scheme for the time discretization of the elasto-plastic or elasto-viscoplastic behavior is proposed, based on a velocity approach. The complete set of equations is given for the evolution problem in the case of small rotations approximation. The method is quite general and may be applied to a large class of constitutive equations. The finite element discretization is briefly outlined and it is shown that the procedure is quite similar to that of previous displacement formulations. A numerical example concerning the sheet metal forming process, with an elasto-viscoplastic behavior and a membrane approximation, is presented. The numerical tests show a considerable improvement in accuracy for a given increment of time.

FE Simulation of Spin Forming Process Based on Fuzzy Intelligent Method

2004 ◽  
Author(s):  
Shoichiro Yoshihara ◽  
Pinaki Ray ◽  
Bryan MacDonald ◽  
Hiroshi Koyama ◽  
Masanori Kawahara
Keyword(s):  
Finite Element ◽  
Metal Forming ◽  
Processing Time ◽  
Fe Simulation ◽  
Fe Analysis ◽  
Deformation Mechanisms ◽  
The Finite Element Method ◽  
Forming Process ◽  
Experimental Conditions ◽  
Manufacturing Techniques

In recent years, Finite element (FE) analysis of manufacturing using not only metal forming but also other forming processes has contributed to the imporvement of these manufacturing techniques and increased knowledge regarding the deformation mechanisms that occur during forming. An analysis of spin forming using FE simulation was performed by authors. Moreover, a fuzzy algorithm to optimize spin forming was developed to decrease the processing time and the number of processing paths. The algorithm was validated as the processing time was shortened by around 15% less than in the case of the process without control. Furthermore, the forming velocity was increased by using the fuzzy control during the process. In this study, the fuzzy intelligent method for expanding the geometry of the blank in spin forming was investigated using the finite element method. It is shown that the flexibility of the fuzzy intelligent method investigated improves several experimental conditions and reduces the duration of the process.

Finite Element Modeling of Superplastic Forming of Tubular Shapes

2010 ◽  
Vol 433 ◽  
pp. 179-184 ◽  
Author(s):  
Mohammed A. Nazzal ◽  
Fadi K. Abu-Farha
Keyword(s):  
Finite Element ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Superplastic Forming ◽  
Forming Process ◽  
Tube Forming ◽  
Pressure Profiles ◽  
Significant Difference ◽  
Work Done

Most of the work done on superplastic forming is related to sheet metal forming. Very limited studies have been directed toward investigating the superplastic tube forming process. In this work, Finite Element (FE) simulations are carried out in order to simulate the superplastic tube forming process. The analysis is conducted for the superplastic magnesium alloy AZ31 at 400°C. The results clearly demonstrate that there is a significant difference between tube forming and sheet metal forming in terms of forming pressure profiles. In addition, the effects of tube radius, free forming length, and contact on the tube forming process are investigated.

Metal Forming and the Finite-Element Method

1989 ◽  
Author(s):  
Shiro Kobayashi ◽  
Soo-Ik Oh ◽  
Taylan Altan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Metal Forming ◽  
Computer Aided Design ◽  
The Finite Element Method ◽  
Forming Technology ◽  
Computer Aided ◽  
Deformation Mechanics ◽  
Aided Design ◽  
Element Method

The application of computer-aided design and manufacturing techniques is becoming essential in modern metal-forming technology. Thus process modeling for the determination of deformation mechanics has been a major concern in research . In light of these developments, the finite element method--a technique by which an object is decomposed into pieces and treated as isolated, interacting sections--has steadily assumed increased importance. This volume addresses advances in modern metal-forming technology, computer-aided design and engineering, and the finite element method.

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