15 Simulation of Multi-step Tube Hot Gas Forming Process …
193
0
20
40
60
80
100
120
140
Effective
heat
transfer
coefficient (Wm
-2
K
-1
)
Temperature ( C)
Transfer coefficient
0.0
0.2
0.4
0.6
0.8
1.0
Friction coefficient
Friction coefficent
0
2 0
4 0
6 0
8 0
1 0 0
0
1000
2000
3000
4000
5000
heat transfer conductance
(Wm
-2
K
-1
)
Pressure (MPa)
Fig. 15.12 Contact interface parameters