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Effect of inclination angle on the absorptance of a graphite-coated
cold-rolled steel sheet irradiated by laser
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This work presents an experimental-numerical methodology aimed at deriving the
relation between absorptance and incident angle of a randomly polarized Yb
fiber-laser beam applied to a graphite-coated stainless steel cold-rolled sheet.
The absorptance values were obtained by minimizing the error between
temperature evolution measurements at
various locations of the irradiated sheet and the corresponding
finite element predictions. The absorptance was found to increase from 0.66 to
0.71 in the region between 0° and 10°, to return to the original value between
10° and 20°, to remain relatively constant between 20° and 50°, and then to drop
sharply between 50° and 80° finishing at 0.44. Furthermore, the consequences of
these results in the laser bending process are analyzed.
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