Optimization of transversal flow stress and strain and weld seam microstructure analysis in butt-HDPE friction stir welded plates

Open Access

Table 3

ANOVA Tables of the reduced models of (σ_FT) and (ε_FT)

Reduced quadratic model of (σ_FT)									Reduced quadratic model of (ε_FT)

Source	DF		Adj SS		Adj MS	F-Val.		P-Val.	Source	DF	Adj SS		Adj MS	F-Val.		P-Val.
Model	8		1400.3		175.04	15.66		0.000	Model	4	0.0796		0.0199	21.41		0.000
Blocks	2		161.53		80.77	7.23		0.002
Linear	3		726.42		242.14	21.67		0.000	Linear	2	0.0497		0.0249	26.75		0.000
N	1		406.46		406.46	36.37		0.000	N	1	0.0264		0.0264	28.43		0.000
F	1		5.60		5.60	0.50		0.483
S	1		314.35		314.35	28.13		0.000	S	1	0.0233		0.0233	25.08		0.000
Square	1		165.72		165.72	14.83		0.000	Square	1	0.0123		0.0123	13.22		0.001
N*N	1		165.72		165.72	14.83		0.000	N^*N	1	0.0123		0.0123	13.22		0.001
2-WI^*	2		346.63		173.32	15.51		0.000	2-WI^*	1	0.0176		0.0176	18.90		0.000
N^*S	1		300.65		300.65	26.90		0.000	N^*S	1	0.0176		0.0176	18.90		0.000
F^*S	1		45.99		45.99	4.12		0.048
Error	45		502.88		11.18				Error	49	0.0455		0.0009
LoF^**	36		489.36		13.59	9.05		0.001	LoF^**	40	0.0441		0.0011	7.00		0.002
PE^***	9		13.52		1.50				PE^***	9	0.0014		0.0002
Total	53		1903.18						Total	53	0.1251
Model summary									Model summary
Std		R-sq		R-sq(adj)			R-sq(pred)		Std	R-sq		R-sq(adj)			R-sq(pred)
3.343		73.68%		68.88%			61.35%		0.030	63.60%		60.63%			56.24%

(*) 2-Way Interaction; (**) Lac of Fit; (***) Pure Error.

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