THE BASIC STUDY ABOUT THE EFFECT OF SINGLE-POINT GRINDING ON THE BENDING STRENGTH OF BRITTLE MATERIAL

Single point grinding was investigated by using a sliding indentation apparatus. Sharp indenter sliding against brittle solid produces a scr atch with a median crack. The size of the crack depends on the applied indenter load and the sliding speed. The effect of the crack size and its orientation on bending strength of glass is investigated experime ntally. It is shown that the tested glass has high bending strength wh en the indenter load is low, bending direction is parallel to the scra tch, and sliding speed is low. The results of bending test are predict able by fracture mechanics analysis including residual stress effect. This study makes it possible to understand the influence of grinding c onditions on the bending strength of ground ceramics.