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Table 8.9
Variance
analysis
do
experiment
DOE2
disregarding
the
parameter
Interaction
between 1L and 2L
Parameter
SS
df
MS
F 0
P-value
(1) Injection time (L)
160.8908
1
160.8908
231.7427
0.000022
Injection time (Q)
13.4958
1
13.4958
19.4390
0.006963
(2) Packing pressure (L)
197.8004
1
197.8004
284.9063
0.000013
Packing pressure (Q)
3.3640
1
3.3640
4.8454
0.078971
Error
3.4713
5
0.6943
Total
379.1306
9
100
Factors Effect [accumulated %]
80
60
A Packing Pressure (L)
B Injection Time (L)
C Injection Time (Q)
D Error
40
20
E Packing Pressure (Q)
0
D
E
A
B
C
Factor
Fig. 8.9
Pareto chart, experiment DOE2
is represented by Fig. 8.10 . Equation ( 8.2 ) represents the second-order model
describing such response surface. Equation coefficients are given in Table 8.10 .
TRS ¼ a b T inj þ c T inj d P rec þ e P rec þ f T inj P rec
ð 8 : 2 Þ
where:
TRS
Surface Residual Stresses [MPa];
T inj
Injection Time [s];
P rec
Packing Pressure [MPa];
A response surface of experiment DOE2 in Fig. 8.10 is a graphic demonstration
of the solution to Eq. 8.2 . It also shows the position of residual stress values of the
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