Micro-particle model of crack formation in glass

During the mechanical action of an abrasive grain, fracture of the glass surface occurs owing to the formation of primary crack. The interlacing of adjacent cracks the glass reptures at a certain definite distance from the surface. These cracks were removed as a fine fragments during grinding process for optical surface. The simulations of such phenomena such as Prinston and Kachalov's are macro scope point of view which can not explain the mechanical properties of the glass. In this paper, the micro-particle models of grinding crack formation has been builddup. Glass material is assumed to be made form different particles combined together by elastic bound forces. The crack is formed when particles on each layer of the packing be broken or sheared off if the forces between particle contacts exceed the strength of the bound. The computer simulation results could be taken any nymber of particles, arranged in any structure with any elastic bound force. This microscope mechanism provide more insight to the granding phenomenon.