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

Table 1

Elastic modulus, Poisson’s ratio, and uniaxial compressive strength.

β (°)	Specimen	Compressive strength (MPa)	The average of compressive strength (MPa)	Elastic modulus (MPa)	The average of elastic modulus (MPa)	The average of Poisson’s ratio
						0°	0-1	70.08	74.79	36.67	38.38	0.19	0.19
0-2	63.86	41.02
0-3	90.43	37.45
30°	1-1	35.56	32.21	25.00	23.00	0.20	0.21
	1-2	30.45		23.45
	1-3	30.65		20.55
45°	2-1	32.45	24.96	25.56	21.77	0.23	0.20
	2-2	20.56		19.00
	2-3	21.87		20.75
70°	3-1	30.20	27.00	20.38	23.98	0.22	0.24
	3-2	28.37		24.38
	3-3	22.43		27.18
80°	4-1	56.36	63.39	30.55	32.96	0.30	0.18
	4-2	67.85		32.89
	4-3	65.96		35.44
90°	5-1	71.16	70.50	42.22	41.85	0.25	0.23
	5-2	69.39		42.74
	5-3	70.95		40.59