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To analyze the mechanical parameters and fatigue damage evolution under uniaxial compression, the stress
strain curve, failure process characteristics, strength properties and deformation of cracked sandstone specimens were
studied under various stress conditions. Initially, during loading and unloading periods, the optical images of sample
were presented for digital image correlation (DIC) analysis. After this, sandstone samples subjected to cyclic loading
with different crack parameters were tested with electric universal machine. Within the framework of origin software,
the damage variable of cracked sandstone samples was defined by the strain variation analysis. The results exhibited
that the dissimilarity of mechanical parameters under cyclic loading was closely associated to the experimental
situations. The elastic modulus (E) of the samples under cyclic loading showed a “strengthening” phenomenon. With
the increase of crack bridge inclination angle (β), the peak strength decreased firstly and then increased regularly.
While, with the increase of crack inclination angle (α), the crack initiation stress and peak strength increased first and
then decreased linearly. By using the fitting analysis of the damage evolution equation, it was proved that the damage
variable definition method was suitable for the damage-evolution characteristics of prefabricated cracked sandstone.
Yuan Xu, Fengyu Ren, Zulkifl Ahmed, Kaiyi Wang. (2020) Mechanical and Fatigue Damage Evolution Properties of Cracked Sandstone under Cyclic Loading, , PROC. OF THE PAS: A; 57, Issue 1.
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