Influence of Pdc Cutter Angle on the Failure Mechanism of Rock Like Material Using Experimental Test and Numerical Simulation

In this paper, the effect of PDC cutter angle on the failure mechanism of rock like materials was investigated using experimental test and numerical simulation. For this purpose, three PDC cutter with different angle were built, i.e. 0°, 30° and 60°. Nine gypsum sample with dimension of 14cm*11cm*5cm were prepared. The ratio of gypsum to water was equal to 2. For each PDC angle, three similar gypsum blocks were tested. The blocks were situated above the PDC cutters and these assemblies were fixed in Uniaxial test machine. The loading rate was 0.05 mm/min. concurrent with experimental test, numerical simulation was performed using particle flow code in two dimension. Firstly calibration of PFC was done using experimental results. Secondly, numerical model with dimension of 14cm*11cm was prepared. Then, five PDC cutter angles were built, i.e. 0°, 15°, 30°, 45° and 60°. These cutters were situated at lower part of the model and move in positive side of y direction by rate of 0.01 mm/min. the results show that failure patterns were affected by PDC angle. Also maximum failure load was controlled by failure pattern. The maximum failure load was decreased by increasing the PDC cutter angle. The maximum failure load was related to angle of 0. The minimum failure load was related to angle of 60. The experimental results were similar to numerical simulations out puts.