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

Table 4

ANOVA results for waviness error.

Source	DF	Adj SS	Adj MS	F value	value
Regression	5	2.95	0.59	28.64	<0.01
d	1	0.02	0.02	0.94	0.337
s	1	0.06	0.06	3.09	0.086
t	1	0.64	0.64	31.10	<0.01
d ∗ s	1	0.18	0.18	8.80	0.005
d ∗ t	1	0.11	0.11	5.53	0.023
Error	42	0.86	0.02
Lack-of-Fit	10	0.40	0.04	2.71	0.016
Pure error	32	0.46	0.015
Total	47	3.81
Model summary	R-sq 77.32%	R-sq (adj) 74.62%		R-sq (pred) 70.38%