Experimental investigation and numerical simulation of the influence of the strain rate in laser forming are presented. To isolate and effectively study the strain rate effects, which are temperature dependent, a “constant peak temperature” method is developed with the aid of numerical modeling and solution. Under the condition of the constant peak temperature, the effects of strain rate on forming efficiency, residual stress and hardness of the formed parts are studied both experimentally and numerically. In the numerical model, the temperature dependence and strain-rate dependence of the flow stress and other material properties are considered. The simulation results are consistent with the experimental observations. The micro-structural changes of the formed parts are also presented.

1.
Magee
,
J.
,
Watkins
,
K. G.
,
Steen
,
W. M.
, “
Advances in laser forming
,”
Journal of Laser Application
, Vol.
10
,
1998
, pp.
235
246
.
2.
Vollertsen
,
F.
, “
Mechanism and models for laser forming
,”
Laser Assisted Net Shape Engineering, Proceedings of the LANE’94
, Vol.
1
,
1994
, pp.
345
360
.
3.
Arnet
,
H.
, and
Vollertsen
,
F.
, “
Extending laser bending for the generation of convex shapes
,”
IMechE Part B: Journal of Engineering Manufacture
, Vol.
209
,
1995
, pp.
433
442
.
4.
Vollertsen
,
F.
,
Geiger
,
M.
, and
Li
,
W. M.
, “
FDM and FEM simulation of laser forming a comparative study
,”
Advanced Technology of Plasticity
, Vol.
3
,
1993
, pp.
1793
1798
.
5.
Hsiao
,
Y.-C.
,
Shimizu
,
H.
,
Firth
,
L.
,
Maher
,
W.
, and
Masubuchi
,
K.
, “
Finite element modeling of laser forming
,”
Proc. ICALEO
97
, Section A,
1997
, pp.
31
40
.
6.
Alberti
,
N.
,
Fratini
,
L.
, and
Micari
,
F.
, “
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
,
1994
, pp.
327
336
.
7.
Magee
,
J.
,
Watkins
,
K. G.
,
Steen
,
W. M.
, “Edge effects in laser forming,” Laser Assisted Net Shape Engineering 2,
Proceedings of the LANE’97
,
Meisenbach Bamberg
,
1997
, pp.
399
406
.
8.
Bao
,
J.
and
Yao
,
Y. L.
, “Analysis and prediction of edge effects in laser bending,”
to be presented ICALEO’99
,
San Diego
,
CA
,
Nov
.
1999
.
9.
Li
,
W.
, and
Yao
,
Y. L.
, “
Laser forming with constant line energy
,”
submitted to International Journal of Advanced Manufacturing Technology
,
1999
.
10.
Boley
,
B.
, and
Weiner
,
J. H.
,
Theory of Thermal Stresses
,”
Dover Publications, In
,
1997
.
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