Study of the Effect of Process Parameters on Surface Profile Accuracy in Single-Point Incremental Sheet Forming of AA1050-H14 Aluminum Alloy

Table 3

ANOVA results for normalized circularity error (NC3).

Source	DF	Adj SS	Adj MS	F value	value
Regression	7	0.000421	0.00006	7.93	<0.01
d	1	0.00002	0.00002	2.59	0.116
s	1	0.00008	0.00008	10.57	0.002
t	1	0.000021	0.000021	2.78	0.104
d ∗ s	1	0.000001	0.000001	0.09	0.761
d ∗ t	1	0.000068	0.000068	9.00	0.005
s ∗ t	1	0.000002	0.000002	0.33	0.57
d ∗ s ∗ t	1	0.000197	0.000197	25.96	0.01
Error	36	0.000273	0.000008
Lack-of-Fit	8	0.000061	0.000008	1.01	0.454
Pure error	28	0.000212	0.000008
Total	43	0.000694
Model summary	R-sq 53.01%	R-sq (adj) 60.66%		R-sq (pred) 42.43%