Mechanical and Fatigue Damage Evolution Properties of Cracked Sandstone under Cyclic Loading
Damage Evolution Law of Sandstone
Keywords:
Fatigue damage, Elastic modulus, Pre-fabricated cracked sandstone, Cyclic load, Failure mode, Mesoscopic mechanism, Damage variableAbstract
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.
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