STUDY OF THE INITIAL DAMAGE OF A COPPER SLAG ABRASIVE TO INCREASE THE PRODUCTIVITY OF HYDROABRASIVE CUTTING

The results of solving the problem of predicting the occurrence of microcracks and assessing the initial damage of a copper slag particle, which can develop under the influence of an external load during hydroabrasive cutting or selective disintegration are presented. A description of the stress-strain state of a crack in a copper slag abrasive is proposed based on the consideration of non-local interactions of continuum particles. A plain crack in a state of equilibrium is considered. The crack edges smoothly close in its corners, having a common tangent plane. In the classical model, infinite stresses arise in this case. The paper shows that the crack edges can be considered as material surfaces with their own material characteristics and as elastic beams of finite thickness. As an example, a model of the surface layer in the form of a beam was used to assess the degree of crack opening in an abrasive particle in natural conditions. It is shown that such an opening has a small but finite value. The paper shows that due to the presence of internal initial stresses in a copper slag particle generated by non-local interactions of elastic continuum particles, microcracks may appear in it, which means the existence of initial damage affecting the performance of hydroabrasive cutting.