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Thermal stress distributions and microstructure in laser cutting of thin Al–Si alloy sheet
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10.2351/1.4807081
/content/lia/journal/jla/25/4/10.2351/1.4807081
http://aip.metastore.ingenta.com/content/lia/journal/jla/25/4/10.2351/1.4807081

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic view of laser cutting process and the coordinate system and (b) mesh layout used for simulation.

Image of FIG. 2.
FIG. 2.

Temporal variation of surface temperature predicted from the simulations and obtained from the thermocouple data.

Image of FIG. 3.
FIG. 3.

(a) Temperature variation along top edge for different heating periods and (b) temperature contours at the kerf surface and inside the workpiece at the end of the heating cycle ( = 0.05 s).

Image of FIG. 4.
FIG. 4.

(a) von Mises stress variation along top edge for different heating periods and (b) von Mises contours at the kerf surface and inside the workpiece at the end of the heating cycle ( = 0.05 s).

Image of FIG. 5.
FIG. 5.

Temperature distribution along the top (a) and bottom (b) cut edges during different cooling periods after heating cycle ends at  = 0.05 s.

Image of FIG. 6.
FIG. 6.

(a) von Mises stress variation along the top edge of the cut section for different cooling periods and (b) von Mises stress contours at the kerf surface and inside the workpiece at the end of the cooling cycle ( = 100 s).

Image of FIG. 7.
FIG. 7.

Temperature distribution (a) and von Mises stress distribution (b) along the -axis (across the top surface from the top edge) for different cooling periods. The laser beam axis location is at  = 0.005 m where laser power ceases. The cooling period starts at  = 0.05 s and ends at  = 100 s.

Image of FIG. 8.
FIG. 8.

Temperature distribution (a) and von Mises stress distribution (b) along the -axis (across the thickness of the workpiece at the kerf surface) for different cooling periods. The laser beam axis location is at  = 0.005 m and  = 0 where laser power ceases. The cooling period starts at  = 0.05 s and ends at  = 100 s.

Image of FIG. 9.
FIG. 9.

Optical photographs of top and bottom surface of the laser cut sheet.

Image of FIG. 10.
FIG. 10.

SEM micrographs of the kerf surface showing (a) the striation pattern (b) dross attachment at the bottom edge.

Image of FIG. 11.
FIG. 11.

EDS analysis of the kerf top surface. The presence of oxygen in the EDS data confirms the oxidation reaction occurred at the kerf surface.

Image of FIG. 12.
FIG. 12.

XRD diffractogram taken at the kerf surface.

Tables

Generic image for table
TABLE I.

Thermal and mechanical properties used in the simulations (Refs. ). Density = 2640 kg/m, latent heat of melting = 548 000 kJ/kg, Solidus temperature = 845 K, and liquidus temperature = 850 K.

Generic image for table
TABLE II.

Laser cutting conditions used in the experiment.

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/content/lia/journal/jla/25/4/10.2351/1.4807081
2013-05-22
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thermal stress distributions and microstructure in laser cutting of thin Al–Si alloy sheet
http://aip.metastore.ingenta.com/content/lia/journal/jla/25/4/10.2351/1.4807081
10.2351/1.4807081
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