Experimental investigation of fatigue crack propagation in interbedded marble under multilevel cyclic uniaxial compressive loads

Multilevel cyclic loading–unloading uniaxial compressive testing combined with real‐time acoustic emission monitoring (AE) and post‐test computed tomography (CT) scanning was employed to investigate the anisotropic cracking propagation and the type of crack classification for interbedded marble. An AE parameter method using RA (ratio of rise time to amplitude) and AF (ratio of AE counts to duration) is used to classify cracking event modes and...