“…Meanwhile, the subsurface micro cracks' length may also be considered as an index of the SSD magnitude to a certain extent. In addition, the effects of grinding parameters on the micro crack's length are in accordance with the existing research results about how grinding parameters influence the depth of SSD and surface roughness [10,11,13,15]. Figures 4b, 5b, 6b, and 7b show that the maximum angle, the average angle, and the minimum angle are all not affected by the change of average abrasive size, grinding force, grinding wheel speed, and grinding depth, respectively.…”