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

Table 2

Dissipated energy for sandstone specimens under Type 1 cyclic loading tests in J/m³.

Number of cycles	Number of specimens
	#1	#2	#3
1	6.12 × 10^4	6.26 × 10^4	5.70 × 10^4
2	3.02 × 10^4	2.86 × 10^4	3.35 × 10^4
3	2.21 × 10^4	2.77 × 10^4	2.62 × 10^4
4	1.98 × 10^4	2.21 × 10^4	2.02 × 10^4