实验和理论结果表明，在间歇切削过程中，出口处的剪切角小于切口中部的剪切角。在某些情况下，这种旋转会导致负剪切，并导致刀具上产生更高的拉伸应力，从而导致刀具断裂。

EXPERIMENTAL AND THEORETICAL RESULTS ARE PRESENTED TO SHOW THAT SHEAR ANGLES AT EXIT CHANGE DURING INTERMITTENT CUTTING AND ARE SMALLER THAN THE ONE IN THE MIDDLE OF THE CUT. THIS ROTATION CAUSES NEGATIVE SHEAR UNDER CERTAIN CONDITIONS, AND RESULTS IN HIGHER TENSILE STRESS ON THE CUTTER LEADING TO TOOL BREAKAGE.