Abstract
The percent TRS reduction, DTRS, which is the percent reduction of the transverse rupture strength of metal matrix diamond segments with or without diamonds, is a key metric for evaluating the bonding condition of diamonds in a matrix. In this work, we build, calibrate, and verify a discrete-element simulation of a metal matrix diamond segment to obtain DTRS for diamond segments with various diamond-grain sizes, concentrations, and distributions. The results indicate that DTRS increases with increasing diamond-grain concentration and decreases with increasing diamond-grain size. Both factors can be explained by the total diamond contact length, the increase of which causes the increase in DTRS. The distribution of diamond grains in segments also strongly influences the increase of DTRS. The use of DTRS as a metric to assess the bonding condition of diamonds in matrixes is not valid unless the diamond-grain size, concentration, and distribution and total diamond contact length are the same for all diamond segments under consideration.
Highlights
Metal matrix diamond segments are key components for metal matrix diamond tools, which are widely used in industrial applications
The major factors affecting the percent of transverse rupture strength (TRS) reduction, DTRS, of diamond segments are the
The major factors affecting the percent of TRS reduction, DTRS, of diamond segments are the diamond-grain size, concentration, and distribution within the diamond segment
Summary
Metal matrix diamond segments are key components for metal matrix diamond tools, which are widely used in industrial applications. Found that DTRS sometimes changes unexpectedly, the metal matrix, diamond-grain size, and diamond concentration were the same in each experiment. In addition to the diamond-grain distribution, the diamond-grain concentration and size have not been fully studied, and all these factors are difficult to control in experiments. To resolve this difficulty, we use the discrete-element method (DEM) to simulate these systems. In this work, we first build, calibrate, and verify a DEM simulation of a Co-based metal matrix diamond segment, and analyse the percent TRS reduction of DEM-simulated diamond segments with different diamond-grain concentrations, sizes, and distributions
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