scholarly journals Numerical Modelling of the Three-Roll Bending Process of a Thin Plate

2020 ◽  
Vol 13 (1) ◽  
pp. 133-136
Author(s):  
Péter Máté ◽  
András Szekrényes
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Method ◽  
Simple Procedure ◽  
Rolling Direction ◽  
Curvature Function ◽  
The Finite Element Method ◽  
Roll Bending ◽  
Bending Process ◽  
Element Method

AbstractThe three-roll bending process is a simple procedure, commonly used in the industry, through which a cylindrical surface can be produced from a sheet plate. This process is mainly controlled through experience and it is described with the finite element method, except for a very few numerical and analytical investigations. The topic of this article is to present a numerical method, through which the curvature function along the rolling direction can be calculated. This article presents the proposed numerical method and its verification with the finite element method. The results of the two numerical methods are in good agreement.

Experimental and numerical investigation of wrinkling and tube ovality in the rotary draw bending process

2019 ◽  
Vol 233 (16) ◽  
pp. 5568-5584 ◽  
Author(s):  
R Safdarian
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Experimental Tests ◽  
Steel Tube ◽  
Numerical Results ◽  
The Finite Element Method ◽  
Rotary Draw Bending ◽  
Bending Process ◽  
Draw Bending ◽  
Element Method

The tube wrinkling, ovality, and fracture are the main defects in the rotary draw bending process, which happen by incorrect selection of process parameters. In the present study, the wrinkling, fracture, and ovality of BS 3059 steel tube in the rotary draw bending were investigated using the experimental tests and the finite element method. The numerical results were verified using the experimental tests for tube ovality prediction. The tube fracture was predicted using the Gurson–Tvergaard–Needleman damage model in the rotary draw bending numerical simulations. The design of experiment based on the response surface method and the finite element method was used to investigate the effects of rotary draw bending parameters such as boosting velocity of pressure die, mandrel position, number of balls, and pressure of pressure die on the wrinkling, fracture, and tube ovality. The experimental and numerical results indicated that the mandrel position was one of the main parameters, which influence the tube ovality. The tube ovality and wrinkling increased with the increase in the mandrel position.

scholarly journals THIN-WALLED EPOXY-GLASS FIBRE BEAMS SUBJECTED TO PURE BENDING

2013 ◽  
Vol 7 (2) ◽  
pp. 83-88
Author(s):  
Tomasz Kubiak ◽  
Zbigniew Kołakowski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Method ◽  
Order Approximation ◽  
The Finite Element Method ◽  
Glass Composite ◽  
Pure Bending ◽  
Walled Channel ◽  
Thin Walled ◽  
Element Method

Abstract Buckling and postbuckling behaviour of thin-walled channel section beam made of epoxy-glass composite have been considered. The beams under analysis was subjected to pure bending. The main aim was check the influence of ply arrangement on buckling load and postbuckling behaviour and validate the authors analytical-numerical method by commercial finite element method software. Mentioned analytical-numerical method has been developed for more than 25 years in Department of Strength of Materials. This method uses asymptotic Koiter theory for conservative systems in the second order approximation modified by Byskov and Hutchinson. Additionally, using the finite element method software the influence of ply arrangement on failure load were checked.

scholarly journals Mathematical modeling in preoperative planning for reconstructive and plastic surgery

2005 ◽  
Vol 52 (3) ◽  
pp. 87-90
Author(s):  
I. Pavlovic ◽  
V. Potkonjak ◽  
S. Djuricic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Plastic Surgery ◽  
Preoperative Planning ◽  
Simple Procedure ◽  
Mechanical Analysis ◽  
The Finite Element Method ◽  
Three Dimensional Model ◽  
Technical Improvement ◽  
Element Method

Social importance of skin emphasizes an importance of quality of methods of planning for reconstructive and plastic surgery. With modern technical improvement the usage of complex mathematical model based on biomechanical characteristics of tissue is possible. Two and three-dimensional model, expert systems and mechanical analysis are used. In this work we tested the system for mechanical analysis in preoperative planning of a simple procedure of the Z-plastic, named the finite-element method. Computer model simulates tissue coverages. With geometrical data some physical characteristics are added. Complex surface of skin is marked by the grid divided in quadrangular elements. Mechanical consequences and definitive results of surgical procedure are analyzed during the computer simulation of the action of tension of skin and suture material. In our analysis we found the finite-element method of great usefulness and noticed that "surgery simulators" might be an efficient way to speed-up learning curve in reconstructive surgery.

Influence of coined-bead die on spring-back characteristics in V-die bending process using the finite element method

2021 ◽  
pp. 095440542199567
Author(s):  
Sutasn Thipprakmas ◽  
Arkarapon Sontamino
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bend Angle ◽  
The Finite Element Method ◽  
Spring Back ◽  
Bead Width ◽  
Physical Experiments ◽  
Inner Radius ◽  
Bending Process ◽  
Element Method

The coined-bead technique is an effective approach for controlling the spring-back characteristics involved in sheet-metal bending. Most previous studies have focused on the application of the coined-bead punch. In this application, bead marks are commonly formed on the inner radii of the bent components. To ensure the precision of the inner bent radius, a coined-bead die can be employed. However, information and data pertaining to coined-bead die applications are currently lacking. In the present research, the influences of the coined-bead die on the spring-back characteristics during V-die bending are investigated for aluminium alloy sheets (AA1100-O), by using the finite element method (FEM) and related physical experiments. Based on material flow and stress distribution analyses, it is found that the bending mechanism of coined-bead die application (particularly in the coining stage) is different from that of coined-bead punch application. Moreover, an increase in the punch radius-to-workpiece thickness ratio and decreases in the bend angle and coined-bead width result in increased spring-back characteristics. It is revealed that the coined-bead die can be applied to prevent spring-back characteristics and the bead mark at the inner radius. However, it was also noted that the V-shape parameters should be carefully considered for coined-bead applications. In addition, it is recommended that the width of the coined-bead die should be larger than that of the coined-bead punch.

Effect of Orientation and Pre-Tension on Stresses Distribution on V-Die Bending Processes by Finite Element Method

2020 ◽  
Vol 38 (5A) ◽  
pp. 636-648
Author(s):  
Adil S. Jabber ◽  
Aseel H. Abed ◽  
Anwar H. Zabon
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rolling Direction ◽  
The Finite Element Method ◽  
Regular Distribution ◽  
Significant Difference ◽  
Before And After ◽  
Alternative Approaches ◽  
Distribution Of Stresses ◽  
Element Method

Simulation of metal forming processes using the Finite Element Method (FEM) is a well-established procedure, being nowadays possible to develop alternative approaches, such as inverse methodologies, in solving complex problems. This study investigated the effect of orientation and pre-tension on stresses distribution numerically by software ANSYS 19 using the finite element method. The pre-tension is 55% from total strained in each rolling direction. The results show that the orientation has a significant effect on stresses distribution and stress value before and after pre-tension 55%. Although there is a regular distribution of stresses in three direction, but there is significant difference in the values of stresses in each of (0, 45, 90) degrees. The highest value of the stress is in the 0̊ to rolling direction, while the least value of the stress recorded in 45̊ to rolling direction. The pre-tension has a greater impact on stresses distribution and stress value. Although, there is a regular distribution of stresses in blank before and after pre-tension, but there is significant difference in the values. Where in 0 degree on rolling direction the stresses increased by 31.7% from their values before pre-tension, while in 45 degrees on rolling direction the stresses increased by 35.6% and in 90 degrees on rolling direction the stresses increased by 23.6% from their values before pre-tension.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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