通常发现，与纵向磨削相比，在承受四点弯曲的弯曲钢筋中，横向磨削拉伸应力方向会导致较低的强度。在本研究中，在纵向和横向三种不同条件下，对由反应粘结和烧结反应粘结氮化硅（RBSN和SRBSN）制成的标准挠曲试样进行表面研磨，以评估研磨方向对强度的影响。

IT IS GENERALLY FOUND THAT GRINDING TRANSVERSE TO THE TENSILE STRESS DIRECTION IN FLEXURE BARS SUBJECTED TO FOUR-POINT BENDING RESULTS IN A LOWER STRENGTH COMPARED TO GRINDING IN THE LONGITUDINAL DIRECTION. IN THE PRESENT STUDY, STANDARD FLEXURE SPECIMENS MADE FROM A REACTION- BONDED AND A SINTERED REACTION-BONDED SILICON NITRIDE (RBSN AND SRBSN) WERE SURFACE GROUND UNDER THREE DIFFERENT CONDITIONS IN BOTH LONGITUDINAL AND TRANSVERSE DIRECTIONS TO ASSESS THE EFFECT OF GRINDING DIRECTION ON STRENGTH.