在缺口试样中，解理断裂的临界事件是铁素体晶粒尺寸的裂纹扩展进入基体，不随试样尺寸和宽度变化。
The critical event for cleavage fracture in notched specimens is the propagation of a ferrite grain-sized crack into the matrix, and is independent of specimen sizes and widths.
结果表明：V型缺口试样的裂纹扩展功能较好地反映材料的缺口敏感性。
The results show that the crack propagation work of V-notched specimen can well reflect the notch sensitivity of the tested steels.
为预测缺口裂纹对加工表面形成的影响，研究了切削脆硬材料时缺口裂纹的扩展。
In order to predict effects on machined surface by developed notch-crack, crack extension mechanism of notch-crack-tip was investigated in cutting brittle materials.
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