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Thermo-Elastic-Plastic Analysis of Plate Forming Process by Flame Bending Method

Seyyed Jalal Hemmati, M.A. Niazi, M. Maarefat, and R. Naghdabadi Faculty of Engineering, Tarbiat Modarres University

Mechanical Engineering Department, Sharif University of Technology

Abstract: Flame bending process is one of the forming processes of steel plates. During this process, plate is formed with heating by gas torch flame followed by controlled cooling along specified paths. Considering simple tools used in the process, it is a popular and economical forming method. At present, this process is manually done on the basis of skilled technician’s

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experience. Experimental and non-automated procedures decrease productivity of the process. In this paper, a method is proposed for simulation of material deformation. Regarding the physics of the process, large deformation thermoelastic-plastic analysis has been applied. In the simulations, a new analytical solution is used for thermal analysis of plate. The analytical solution along with finite element analysis of the deformation in ANSYS program is able to interpret experimental observations. The simulations show reasonable results, compared with the analytical results by other researchers and with experimental data. The method and simulation results can be used to study the process automation.

Keywords: Plate forming, Flame bending process, Thermo Elastic Plastic Analysis

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Page 6: Thermo-Elastic-Plastic Analysis of Plate Forming Process by Flame ...

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Page 7: Thermo-Elastic-Plastic Analysis of Plate Forming Process by Flame ...

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Page 8: Thermo-Elastic-Plastic Analysis of Plate Forming Process by Flame ...

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Page 9: Thermo-Elastic-Plastic Analysis of Plate Forming Process by Flame ...

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Page 10: Thermo-Elastic-Plastic Analysis of Plate Forming Process by Flame ...

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Page 11: Thermo-Elastic-Plastic Analysis of Plate Forming Process by Flame ...

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Page 12: Thermo-Elastic-Plastic Analysis of Plate Forming Process by Flame ...

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1. Iwamura, Y., and Rybicki, E.F., “A Transient Elastic-Plastic Thermal Stress Analysis of Flame Forming,” Journal of Engineering for Industry, pp.163-171, Feb.1973.

2. Moshaiov, A. and Vorus, W., “The Mechanics of the Flame Bending Process: Theory and Applications,” Journal of Ship Research, Vol.31, No.4, pp. 269-281, 1987.

3. Shin, J.G., and Moshaiov, A., “Modified Strip Model for Analyzing the Line Heating Method-Part1: Elastic Plates,” Journal of Ship Research, Vol.35, No.2, pp.172-182, 1991.

4. Shin, J.G., and Moshaiov, A., “Modified Strip Model for Analyzing the Line Heating Method-Part2: Thermo-Elastic Plastic Plates,” Journal of Ship Research, Vol.35, No.3, pp. 266-275, 1991.

5. Jang, C.D., and D.E. Ko, “A Study on the Prediction of Deformations of Plates due to Line Heating Using a Simplified Thermal Elasto-Plastic Analysis,” Journal of Ship Production, Vol.13, No.1, pp. 22-27, 1997.

6. Yu, G., “Modeling of Shell Forming by Line Heating,” Ph.D. Thesis, Massach- usetts Institute of Technology, 2000.

7. Lee, J. H., “Three-Dimensional Simulation of the Mechanics of Line Heating,” M.S. Thesis Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, Korea, 1995.

8. Clausen, H.B., “Three Dimensional Numerical Simulation of Plate Forming by Line Heating,” ICCAS’, pp. 387-398, 1999.

9. Ishiyama, M., Tango, Y., and Nakamura, Y., “Studies of Plate Bending for Practical Use by Computer Aided Line Heating System,” Journal of the Society of Naval Architects of Japan, Vol.183, pp.335-342. 1998.

10. Ueda, Y., Murakawa, H., Rashwan, A.M., Okumoto, Y., and Kamichika, R., “Development of Computer-Aided Process Planning System for Plate Bending (Report 3)- Relation Between Heating Condition and Deformation,” Journal of Ship Production, Vol.10, No.4, pp. 248-257, 1994.

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12. Manca, O., “Quasi-Steady-State Three-Dimensional Temperature Distribution Induced by a Moving Circular Gaussian Heat Source in a Finite Depth Solid,” Int. Journal of Heat Mass Transfer, Vol. 38, No. 7, pp. 1305-1315, 1995.

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