Study on Joint Damage of Double Prefabricated Fragments Penetrating Finite Thickness Concrete

Table 12

Results of multifactor ANOVA of joint damage excluding the open pit area.

	Sum of squares	df	Mean square	F	p value
Intercept	7.84	1	7.84	9.333	0.038
Falling point spacing	2.16	4	0.54	0.643	0.66
Angle of penetration surface	0.56	4	0.14	0.167	0.945
Fragment 1 angle	2.16	4	0.54	0.643	0.66
Fragment 2 angle	2.96	4	0.74	0.881	0.547
Speed combination	2.96	4	0.74	0.881	0.547
Residual	3.36	4	0.84
R^2 = 0.763