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

Table 1

Mechanical properties of sandstone specimens , , and .

Number	Peak strength/MPa	Average/MPa	Young’s modulus/GPa	Average/GPa	Elastic limit/MPa	Average/MPa
	63.22	55.51	8.03	7.41	54.82	47.14
	53.07		6.96		42.79
	50.24		7.24		43.82