Research Article
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% |  | 
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