Application of Digital Image Correlation Technique for the Damage Characteristic of Rock-like Specimens under Uniaxial Compression

Table 3

Evolution process of damage variable of samples S1–S3.

Sample	Damage	A	B	C	D	Damage variation
						AB	BC	CD
S1	Global	0.044	0.052	0.133	0.528	0.182	1.558	2.970
	1	0.026	0.060	0.168	0.776	1.308	1.800	3.619
	2	0.005	0.023	0.079	0.851	3.600	2.435	9.772
	/10^−3	0.390	0.812	1.188	1.565	—	—	—
S2	Global	0.041	0.088	0.235	0.586	1.146	1.670	1.494
	1	0.019	0.061	0.130	0.835	2.250	1.145	5.410
	/10^−3	0.228	0.614	1.071	1.663	—	—	—
S3	Global	0.022	0.032	0.159	0.518	0.455	3.969	2.258
	1	0.018	0.055	0.169	0.769	2.072	2.043	3.560
	ε/10^−3	0.164	0.532	0.966	1.262	——	——	——