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TECHNICAL PAPERS

Numerical and Experimental Study of Strain Rate Effects in Laser Forming

[+] Author and Article Information
Wenchuan Li, Y. Lawrence Yao

Department of Mechanical Engineering, Columbia University, New York, NY 10027

J. Manuf. Sci. Eng 122(3), 445-451 (Jan 01, 2000) (7 pages) doi:10.1115/1.1286731 History: Received July 01, 1999; Revised January 01, 2000
Copyright © 2000 by ASME
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References

Magee,  J., Watkins,  K. G., and Steen,  W. M., 1998, “Advances in laser forming,” J. Laser Appl., 10, pp. 235–246.
Vollertsen, F., 1994, “Mechanism and models for laser forming,” Laser Assisted Net Shape Engineering, Proceedings of the LANE’94, Vol. 1, pp. 345–360.
Arnet,  H., and Vollertsen,  F., 1995, “Extending laser bending for the generation of convex shapes,” IMechE Part B: J. Eng. Manufact.,209, pp. 433–442.
Vollertsen,  F., Geiger,  M., and Li,  W. M., 1993, “FDM and FEM simulation of laser forming a comparative study,” Adv. Technol. Plasticity,3, pp. 1793–1798.
Hsiao, Y.-C., Shimizu, H., Firth, L., Maher, W., and Masubuchi, K., 1997, “Finite element modeling of laser forming,” Proc. ICALEO ’97, Section A, pp. 31–40.
Alberti, N., Fratini, L., and Micari, F., 1994, “Numerical simulation of the laser bending process by a coupled thermal mechanical analysis,” Laser Assisted Net Shape Engineering, Proceedings of the LANE’94, Vol. 1, pp. 327–336.
Sprenger, A., Vollertsen, F., Steen, W. M., and Watkins, K., 1994, “Influence of strain hardening on laser bending,” Laser Assisted Net Shape Engineering, Proceedings of the LANE’94, Vol. 1, pp. 361–370.
Magee, J., Watkins, K. G., and Steen, W. M., 1997, “Edge effects in laser forming,” Laser Assisted Net Shape Engineering 2, Proceedings of the LANE’97, Meisenbach Bamberg, pp. 399–406.
Bao, J., and Yao, Y. L., 1999, “Analysis and predication of edge effects in laser bending,” Proc. 18th Int. Congress on Applications of Lasers and Electro-Optics (ICALEO ’99): Conf. on Laser Materials Processing, San Diego, CA.
Hennige,  T., Holzer,  S., Vollertsen,  F., and Geiger,  M., 1997, “On the working accuracy of laser bending,” J. Mater. Process. Technol., 71, pp. 422–432.
Magee, J., Watkins, K. G., and Steen, W. M., 1997, “Laser forming of aerospace alloys,” ICALEO ’97, Section E, pp. 156–165.
Boley, B. A., and Weiner, J. H., 1997, Theory of Thermal Stresses, Dover, New York.
Hosford, W. F., and Caddell, R. M., 1993, Metal Forming Mechanics and Metallurgy, PTR, Prentice-Hall, Englewood Cliffs, NJ.
Schindler,  I., Strakos,  M., and Sramek,  L., 1989, “Influence of carbon and temperature on the stain rate sensitivity of carbon steel,” Scr. Metall., 23, pp. 1669–1672.
Vashchenko,  A. P., Suntsov,  G. N., Belalova,  G. V., and Medvedev,  A. A., 1991, “Mechanical properties of low carbon steels over a wide range of temperature and strain rates applied to processes of thin sheet rolling,” Strength Mater., 22, pp. 1205–1214.
Maekawa,  K., Shirakashi,  T., and Usui,  E., 1983, “Flow stress of low carbon steel at high temperature and strain rate (part 2)—Flow stress under variable temperature and variable strain rate,” Bull. Jpn. Soc. Precis. Eng., 17, pp. 167–172.
Li, W., and Yao, Y. L., 1999, “Laser forming with constant line energy,” Int. J. Adv. Manufact. Technol., Springer-Verlag, submitted.

Figures

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Schematic of straight-line laser bending
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Experimental and numerical bend angle under constant line energy
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Simulated time histories of temperature under the condition of constant line energy 17
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Simulated time histories of temperature at the top surface under the condition of constant peak temperature
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Experimental values of line energy and laser power under the condition of constant peak temperature
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FEM and experimental bend angle under the condition of constant peak temperature
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FEM and X-ray diffraction measurement of residual stress for the samples scanned under the condition of constant peak temperature
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Typical simulated time histories of plastic strains in the Y direction
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Simulated plastic strain in Y direction under the condition of constant peak temperature
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Simulated strain rate in Y direction under the condition of constant peak temperature
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Simulated results for comparison of the effect of high and low strain rate on residual stress
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Hardness vs. simulated plastic strain in Y direction under the condition of constant peak temperature (data in brackets are the corresponding scanning velocities in mm/s)

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