材料的抗拉强度随着材料缺口半径的增加及应力集中系数的降低而降低。
With the increase of notch root radius and the decrease of stress concentration coefficient, the tensile strength decreased.
分析结果表明， 纤维切割过程中，切断刀锋利性能的变化主要与切断刀的初始刃口半径、刃口角度、刃口的磨损量以及刃口上缺口的深度有关。
The result shows that the cutter blade edge radius, edge angle, the linear abrasion and the edge notch depth are main factors affecting its sharpness.
在工作过程中，冲头与凹模切口的半径定位，确保形成所需的圆形，而不至于在圆边产生“缺口”。
The radius of the punch and die cutting edges is laid out to produce the desired circular shape without nicking into the circle as the work proceeds.
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