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Fig. 8.13 Scanning electron microscopy magnified 200 times, settings 1, 6, 12 and 24, after
immersion in acetic acid
Table 8.12 Solution to Eq.
8.2
for constant residual stress
Residual stress (MPa)
Injection time (s)
Packing pressure (MPa)
26.05
6
70.64
26.05
8
63.16
26.05
12
52.21
26.05
16
45.04
26.05
20
40.77
Table 8.13
Main process settings used for injecting specimens with constant surface residual
stress
Parameter
Settings
6
8
12
16
20
Injection time (s)
6
8
12
16
20
Injection temperature (
o
C)
240
240
240
240
240
Mold temperature(
o
C)
50
50
51
51
51
Packing pressure (simulated) (MPa)
71.6
63.5
53.7
45.6
42.3
Packing time(s)
15
15
15
15
15
Residual stress (simulated) (MPa)
25.9
26
25.7
25.9
25.7
Solution of the Eq.
8.2
to constant residual stress of 26,05 MPa
Packing pressure (equation) (MPa)
70.64
63.16
52.21
45.04
40.77
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