Dry Sliding Wear Behaviour of Titanium (Grade 5) Alloy by Using Response Surface Methodology

Table 4

The results of ANOVA table for quadratic model for specific wear rate × 10⁻¹ (mm³/Nm).

Source	Sum of squares	df	Mean square	𝐹 value	Prob. > 𝐹
Model	1.59	9	0.18	331.67	<0.0001	Significant
𝐴-speed	2.250𝐸−003	1	2.250𝐸−003	4.23	0.0667
𝐵-load	1.14	1	1.14	2149.00	<0.0001
𝐶-sliding distance	0.046	1	0.046	86.98	<0.0001
𝐴𝐵	6.612𝐸−003	1	6.612𝐸−003	12.44	0.0055
𝐴𝐶	1.512𝐸−003	1	1.512𝐸−003	2.85	0.1225
𝐵𝐶	4.513𝐸−003	1	4.513𝐸−003	8.49	0.0155
𝐴^2	8.736𝐸−003	1	8.736𝐸−003	16.43	0.0023
𝐵^2	0.061	1	0.061	114.28	<0.0001
𝐶^2	0.11	1	0.11	204.11	<0.0001
Residual	5.316𝐸−003	10	5.316𝐸−003
Lack of fit	4.233𝐸−003	5	8.466𝐸−004	3.91	0.0805	Not significant
Pure error	1.082𝐸−003	5	2.167𝐸−004
Cor total	1.59	19
S.D.	0.023	𝑅-squared		0.9967
Mean	2.68	Adjusted 𝑅-squared		0.9937
C.V%	0.86	Predicted 𝑅-squared		0.9653
PRESS	0.055	Adeq Precision		55.817