FEM Simulation of Laser Forming of Metal Plates*

2000 ◽  
Vol 123 (3) ◽  
pp. 405-410 ◽  
Author(s):  
G. Yu ◽  
K. Masubuchi ◽  
T. Maekawa ◽  
N. M. Patrikalakis
Keyword(s):  
Fem Simulation ◽  
Mesh Size ◽  
Element Model ◽  
Mechanical Analysis ◽  
Metal Plate ◽  
Laser Forming ◽  
Forming Process ◽  
Metal Plates ◽  
Simulation Time ◽  
Good Agreement

A finite element model is developed for thermo-mechanical analysis of the process of metal plate forming by laser line heating. A rezoning technique is adopted to greatly reduce the simulation time. The effects of the refinement of mesh size on temperature distribution and final distortion are studied. Comparison between numerical and experimental results shows a good agreement in final distortion of the formed plate. Finally, edge effects in the laser forming process are studied.

Laser Forming of Plates Using Two Sequent Scans of Different Intervals

2006 ◽  
Vol 220 (4) ◽  
pp. 507-511 ◽  
Author(s):  
H Shen ◽  
Y Shi ◽  
Z Yao
Keyword(s):  
Plastic Deformation ◽  
Cost Reduction ◽  
Fem Simulation ◽  
Element Model ◽  
Laser Forming ◽  
Displacement Fields ◽  
Metal Plates ◽  
Proposed Model ◽  
Bending Process ◽  
External Forces

Laser forming of metal plates offers the advantages of requiring no external forces, cost reduction, and increasing flexibility. It also enables forming of some materials and shapes that are impossible by using the traditional methods. This article presents a finite-element model (FEM) for two-scan laser forming with different intervals along the same path. On the basis of the proposed model, the FEM simulation of the temperature and displacement fields is studied. The simulated results show that the plastic deformation is larger if the interval between the first scan and the second scan is short, which aids the bending process because of the heat retained in the plate.

Microstructure Integrated Modeling of Multiscan Laser Forming

2002 ◽  
Vol 124 (2) ◽  
pp. 379-388 ◽  
Author(s):  
Jin Cheng ◽  
Y. Lawrence Yao
Keyword(s):  
Flow Stress ◽  
Numerical Models ◽  
Flow Behavior ◽  
Fem Simulation ◽  
Constitutive Models ◽  
Low Carbon Steel ◽  
Laser Forming ◽  
Low Carbon ◽  
Forming Process ◽  
Heating And Cooling

Laser forming of steel is a hot forming process with high heating and cooling rate, during which strain hardening, dynamic recrystallization, and phase transformation take place. Numerical models considering strain rate and temperature effects only usually give unsatisfactory results when applied to multiscan laser forming operations. This is mainly due to the inadequate constitutive models employed to describe the hot flow behavior. In this work, this limitation is overcome by considering the effects of microstructure change on the flow stress in laser forming processes of low carbon steel. The incorporation of such flow stress models with thermal mechanical FEM simulation increases numerical model accuracy in predicting geometry change and mechanical properties.

scholarly journals Effect of Differential Speed Rotation Technology on the Forming Uniformity in Flexible Rolling Process

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1906 ◽  
Author(s):  
Yi Li ◽  
Mingzhe Li ◽  
Kai Liu ◽  
Zhuo Li
Keyword(s):  
Element Model ◽  
Rolling Process ◽  
Metal Plate ◽  
Curved Surface ◽  
Forming Process ◽  
Surface Part ◽  
Flexible Rolling ◽  
Speed Rotation ◽  
The One ◽  
Differential Speed

As the local forming non-uniform of the formed curved surface part with larger bending deformation is the one of common defects, the utilization ratio of metal plate greatly reduces due to this defect, and cost of production is also increasing. In this paper, the differential speed rotation technology of flexible rolling process was proposed firstly to solve this forming defect. The finite element model was established, the reason of the local forming non-uniform was discussed; the effect of differential speed rotation technology on the forming uniform was studied. The results show that: Flexible rolling is a process based on thickness reduction, in this forming process, the thickness reduces sharply near the back end of metal plate, the local forming non-uniform of formed curved surface part is caused during this process; the differential speed rotation technology is applied in flexible rolling, with increasing rotation speed difference between upper and lower roll set, the forming uniformity of the formed curved surface part is greatly improved. The results of numerical simulation are in agreement with the result of forming experiments.

Development of Parametric Simulation Models for Metal Forming Processes of Plate Structures

2018 ◽  
Author(s):  
Tom Wurzler ◽  
Thomas Lindemann ◽  
Josefine Kistner ◽  
Patrick Kaeding
Keyword(s):  
Metal Forming ◽  
Simulation Models ◽  
Metal Plate ◽  
The Finite Element Method ◽  
Forming Process ◽  
Common Procedure ◽  
Plate Structures ◽  
Metal Plates ◽  
Die Structure ◽  
Different Types

During the process of workpiece productions in metal forming industries, it is necessary to control the results of the reshaped piece to ensure its quality. A common procedure of metal plate forming processes is given by the application of an upper and lower die. Therefore, ribbed die configurations can be used. To simulate the forming process of metal workpieces, the Finite Element Method (FEM) is a feasible tool. In this paper, a parametric model of a ribbed die structure is developed with the specification that only small imperfections on the workpiece surfaces will appear after the forming process. The workpieces in this paper are plates with thickness values equal and greater than 20mm. Furthermore, the springback behaviour of the different workpieces will be in the main focus of the proposed analyses. The results of the simulations are used to developed different types of holder configurations instead of the lower die. This concept might further reduce the costs of forming processes of large metal plates.

scholarly journals Springback Calibration of a U-Shaped Electromagnetic Impulse Forming Process

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 603 ◽  
Author(s):  
Xiaohui Cui ◽  
Zhiwu Zhang ◽  
Hailiang Yu ◽  
Xiaoting Xiao ◽  
Yongqi Cheng
Keyword(s):  
Tangential Stress ◽  
Three Dimensional ◽  
Element Model ◽  
Simulation Method ◽  
Discharge Voltage ◽  
Electromagnetic Forming ◽  
Forming Process ◽  
Sheet Bending ◽  
Sequential Coupling ◽  
Good Agreement

A three-dimensional (3D) finite-element model (FEM), including quasi-static stamping, sequential coupling for electromagnetic forming (EMF) and springback, was established to analyze the springback calibration by electromagnetic force. Results show that the tangential stress at the sheet bending region is reduced, and even the direction of tangential stress at the bending region is changed after EMF. The springback can be significantly reduced with a higher discharge voltage. The simulation results are in good agreement with the experiment results, and the simulation method has a high accuracy in predicting the springback of quasi-static stamping and electromagnetic forming.

FEM simulation of laser forming process of shipbuilding steel plate

2004 ◽  
Vol 120 ◽  
pp. 507-512
Author(s):  
Zhang Liwen ◽  
Zhong Qi ◽  
Pei Jibin ◽  
Zhang Guoliang ◽  
Xia Yuanliang
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Thermal Stresses ◽  
Steel Plate ◽  
Fem Simulation ◽  
Laser Forming ◽  
Transient Temperature ◽  
Forming Process ◽  
Shipbuilding Steel ◽  
Finite Element Software

Laser forming has become a promising technique to form sheet metal in recent years. This new forming process can produce plastic deformation by thermal stresses resulted from the irradiation of laser beam scanning. In this paper, a 3-D thermo-mechanical FEM model was developed to simulate the laser forming process of shipbuilding steel plate. The finite-element software MSC.Marc was used to calculate the temperature field, stress field and strain field during laser forming process. The transient temperature field and the final bending angle were predicted. Then the effect of laser forming process technical parameters was studied. To evaluate the accuracy of the simulation, a laser forming experiment was performed. It is demonstrated that the finite element simulation results are in good agreement with experimental results.

Numerical Simulation of Glass Bottle Forming Process

2012 ◽  
Vol 503-504 ◽  
pp. 136-139
Author(s):  
Dao Cheng Zhang ◽  
Ke Jun Zhu ◽  
Shao Hui Yin ◽  
Yong Jian Zhu
Keyword(s):  
Fem Simulation ◽  
High Volume ◽  
Mechanical Analysis ◽  
The Finite Element Method ◽  
Glass Bottle ◽  
Forming Process ◽  
Glass Forming ◽  
Glass Containers ◽  
Forming Temperature ◽  
Process Factors

Glass forming process is a high-volume fabrication method for producing glass containers. In this paper, the mechanisms of glass forming process were analyzed. Combined the coupled thermo-mechanical analysis with the finite element method (FEM) simulation, it was carried out to analyze the key process factors such as forming temperature, forming pressure, friction coefficient. The results show that forming pressure has the greatest influence on the stress.

FEM Simulation of Multipass Shape Rolling Processes

2010 ◽  
Vol 148-149 ◽  
pp. 1-6 ◽  
Author(s):  
Hai Liang Yu ◽  
Xiang Hua Liu
Keyword(s):  
Finite Element ◽  
Deformation Behavior ◽  
Fem Simulation ◽  
Element Model ◽  
Rolling Process ◽  
Pure Lead ◽  
Shape Rolling ◽  
First Pass ◽  
H Beam ◽  
Good Agreement

The updating geometric method was proposed to simulate the deformation behavior of workpiece during multipass shape rolling by using finite element method. Firstly, establish and solve the finite element model of the first pass shape rolling process, then update the geometric shape of workpiece after the first pass and delete rolls of the first pass, establish and mesh rolls of the second pass, modify the boundaries and material parameters of workpiece, and solve its deformation behavior during the second pass shape rolling. With the same steps, its deformation behavior during the following passes rolling could be solved. The method was applied to simulate the deformation behavior of a cube workpiece during six-pass H-beam rolling with split-rolling, and its shapes after every pass rolling process were obtained. Experiments on the deformation behavior of slab during multipass rolling were carried out by using pure lead in an experimental mill. The calculated results are in good agreement with the experimental ones.

FEM Simulation and Experimental Study on Miling Force for Aero-Aluminum Alloy Based on Trochoid-Motion

2011 ◽  
Vol 317-319 ◽  
pp. 222-226
Author(s):  
Jin Yu ◽  
Yu Xiang Shi ◽  
Gui Wu Yang
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Finite Element Model ◽  
Fem Simulation ◽  
Element Model ◽  
Milling Force ◽  
Parallel Motion ◽  
Aluminum Alloy 7075 ◽  
The Finite Element Model ◽  
Simulation Time

By analyzing the relative position between tool and workpiece in assemble model of finite simulation, and loading the tool with parallel motion and rotation, a finite element model based on trochoid motion is built. In order to reduce the simulation time and errors advanced meshing method was used to optimize the finite element model. This paper considers performance parameter of the workpiece, and researches a simulation of milling force on the Aero-aluminum Alloy 7075-T7451 by using ABAQUS. The milling force finite element model was verified to be feasible, and the result is reliable.

Numerical Modeling and Initial Fatigue Life Estimations of Welded Structural Components

2014 ◽  
Vol 1029 ◽  
pp. 124-129
Author(s):  
Ivana Vasovic ◽  
Marko Ristic ◽  
Slavica Ristic ◽  
Mirko Maksimovic ◽  
Dragi Stamenkovic
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Residual Stresses ◽  
Numerical Simulations ◽  
Axial Direction ◽  
Element Model ◽  
Mechanical Analysis ◽  
Welding Simulation ◽  
Critical Areas ◽  
Good Agreement

Numerical simulations are powerful tool for analyzing and research in domain of mechanical constructions. In welded joints is very important to determine residual stresses and temperature distribution in sample, apropos, element of construction. In some cases doing the experiment is not possible, so numerical simulations can give the required results and overview of stress state, residual stresses, critical areas, displacement, temperature distribution and other data is needed for analyzing and improvement of constructions or parts of constructions. This analysis includes finite element model for the thermal and mechanical welding simulation. Welding simulation was considered as a sequential coupled thermo-mechanical analysis. The residual stress distribution and magnitude in axial direction was obtained. The paper also shows the results obtained in a simultaneously test of a butt welded thin steel sheet specimen by conventional methods and thermography. Numerical methods are also used in order to predict the crack of specimen. The obtained results confirm that it is very useful to use thermography and Finite Element Method (FEM) for early diagnostics of the complex structures in the exploitation conditions. In this paper is obtained good agreement of results between experiment and Numerical simulations.

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