Failure Mechanism and Effect of Nozzle Parameters on Abrasive Water Jet Rock Breaking

Table 6

Analyses of variance and range for nozzle parameters.

Index	d	α	L	X
①	1 mm	20°	7	0.0818
②	1 mm	30°	8	0.0836
③	1 mm	40°	9	0.1306
④	1 mm	50°	10	0.1336
⑤	2 mm	20°	8	0.0308
⑥	2 mm	30°	9	0.1062
⑦	2 mm	40°	10	0.1514
⑧	2 mm	50°	7	0.1868
⑨	3 mm	20°	9	0.0665
⑩	3 mm	30°	10	0.12
⑪	3 mm	40°	7	0.1393
⑫	3 mm	50°	8	0.2208
⑬	4 mm	20°	10	0.0741
⑭	4 mm	30°	7	0.1175
⑮	4 mm	40°	8	0.1651
⑯	4 mm	50°	9	0.1866
R	0.0293	0.1187	0.0116
SE	0.00423
fE	6
fj	3	3	3
Fj	1.135	14.837	0.137
	F0.1(3,6) = 3.29	F0.01(3,6) = 9.15	F0.1(3,6) = 3.29