The source of cracks is brought into the production process of cutting pieces, and no material can be completely defect free. The number and degree of polished pieces are only different. Despite various efforts in process operations, internal defects are still much more than metal materials. Below, the editor will provide a detailed introduction for everyone.
But this does not mean that if the cutting piece has defects, it will inevitably produce cracks. It is important that the product cannot undergo plastic deformation like metal under external forces. It is easy to concentrate stress on a certain area, causing this part of the defect crack source to quickly transform into a crack. Once an internal crack forms and reaches a certain critical size, it is very easy to expand. The stress that occurs inside immediately concentrates on the crack and extends to both sides. It cannot absorb the energy brought by external forces through changes in its own shape like metals, and can only absorb this energy by generating new surfaces. The expansion of the crack means the formation of two new surfaces.
In this way, the crack rapidly expands and the new surface rapidly increases until the formation or fracture of the crack transforms all the applied energy into the energy produced by the new surface, which is the process of crack formation in the cutting piece.