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TECHNICAL PAPERS

Numerical Simulation of Pulsed Laser Bending

[+] Author and Article Information
X. R. Zhang, G. Chen, X. Xu

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Appl. Mech 69(3), 254-260 (May 03, 2002) (7 pages) doi:10.1115/1.1459070 History: Received November 09, 2000; Revised May 08, 2001; Online May 03, 2002
Copyright © 2002 by ASME
Topics: Lasers , Stress , Computation
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References

Figures

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Schematic of the laser bending process. The laser beam scans along a line in the y-direction, causing residual stress and strain in the laser irradiated area and permanent bending.
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Irradiation of laser pules on the target surface. The laser scans in the positive y-direction.
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Computational mesh (x:200 μm,y:120 μm,z:100 μm)
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Thermal and mechanical properties of full-hard 301 stainless steel
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Experimental setup for pulsed laser bending and for measuring the bending angle [1–ND:VA laser, 2–shutter, 3–polarizing beam splitter, 4–mirror, 5–beam expander, 6–X&Y scanner, 7–specimen, 8–beam splitter, 9–position-sensitive detector, 10–lens, 11–He-Ne laser]
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Temperature distributions induced by the seventh pulse (pulse energy 5.4 μJ; pulse center at y=54 μm) (a) along the scanning line, (b) along the z-direction
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(a) Residual strain (εxx), (b) residual stress (σxx) distributions along the scanning line induced by each laser pulse (pulse energy 5.4 μJ; scanning speed 195 mm/s)
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(a) Residual strain (εxx), (b) residual stress (σxx) distributions along the x-direction (y=60 μm and z=0 μm) after eight pulses
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Residual strain εxx along the scanning line on the top surface obtained by calculating all the 14 pulses and by using the new method (pulse energy 5.4 μJ; scanning speed 195 mm/s)
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Displacement w along the x-direction (y=60 μm and z=0 μm) obtained by calculating all the laser pulses and by using the new method (pulse energy 5.4 μJ; scanning speed 195 mm/s)
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Calculated displacement w at the free edge after each laser pulse as a function of laser energy
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Comparison between the measured bending angles and the simulation results obtained using the new method

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