Experimental Investigation of Sandstone under Cyclic Loading: Damage Assessment Using Ultrasonic Wave Velocities and Changes in Elastic Modulus

Table 4

Young’s modulus for sandstone specimens under Type 1 cyclic loading tests in GPa.

Number of cycles	Number of specimens
	#1	#2	#3
1	5.01	5.03	5.30
2	5.87	5.36	5.89
3	6.49	6.16	6.48
4	7.25	6.73	7.10