Correlation between slab test and rock cutting modeling using 2D Discrete Element Method

摘要

During the last decades, researches about tool/rock interaction of Polycrystalline Diamond Compact (PDC) cutters have been focusing on numerical modeling aspect due to its time efficiency compared to the laboratory testing. Among the different numerical methods, researchers commonly use Discrete Element Method (DEM) to study the rock cutting process. DEM 2D models give good qualitative results. Unfortunately, the calculated cutting forces are not in agreement with the ones measured in laboratory by cutting tests. To be able to compare correctly cutting modeling and cutting laboratory tests, we decided to use the geometric feature of 2D numerical models where the sample and the PDC cutter have the same unit width of one meter and adapted it for the laboratory tests. For this purpose, we prepared rock samples in order to have the same width than the PDC cutter used. Using this method, we highlight the good quantitative correlation between laboratory slab tests and the results provided by the numerical models. Indeed, the evolution of cutting forces depending on the depth of cut is comparable to laboratory tests and they are quite similar in terms of magnitude.