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We found that fatigue damage occurs at the second-order asperities in the upper and lower blocks within low number of cycles, but the fatigue cracks initiated with initiation angle of 90° with respect to the first-order asperities in the upper and lower blocks coalesce with each other (or rock joints) within the high number of cycles.
The critical water pressure increases and the critical initiation angle decreases as the Poisson's ratio increases.
Dealing with fracture initiation angle, both the criteria could estimate the experimental results successfully.
In contrast, the crack initiation angle can possibly be determined independently of the relaxation effect.
The modified maximum tangential stress criterion is used to determine the crack initiation angle of tensile cracks.
In this paper, the crack initiation angle and subsequent crack propagation path are experimentally investigated for limestone rock specimens.
Similar(21)
The crack initiation angles are calculated using two crack initiation criteria: MTS and R-criterion.
A criterion for the three-dimensional stress state is proposed to predict fatigue crack initiation angles.
In this study, a criterion based on the relative minimum plastic zone radius (MPZR) is investigated for prediction of fatigue crack initiation angles.
Considering three values for the crack inclination angle, the effect of thickness is investigated on the predicted crack tip plastic zone size, stress intensity factors and crack initiation angles at the surface and the mid plane.
Then, the experimentally obtained fracture loads and the fracture initiation angles were predicted by using the U-notched maximum tangential stress (UMTS) and the newly formulated U-notched mean stress (UMS) fracture criteria.
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