Related Rule Study of Subcritical Crack Growth and Threshold Values in Transversely Isotropic Slates

Table 7

Threshold values .

β	Specimen no.
0°	0-1	3.268	0.789
	0-2	3.331	0.784
	0-3	3.239	0.764
Average		3.279	0.779
30°	1-1	2.218	0.704
	1-2	2.218	0.739
	1-3	2.621	0.901
Average		2.352	0.781
45°	2-1	1.348	0.518
	2-2	1.440	0.529
	2-3	1.345	0.511
Average		1.378	0.520
70°	3-1	1.548	0.530
	3-3	1.713	0.618
Average		1.631	0.574
80°	4-1	1.838	0.686
	4-2	1.638	0.642
	4-3	2.016	0.672
Average		1.838	0.661
90°	5-1	2.391	0.759
	5-2	2.240	0.772
	5-3	2.166	0.774
Average		2.266	0.768