他发现聚碳酸脂中的屈服区是延伸至裂纹前沿的长条裂缝。
The yield zones he found in polycabonate were slits extending ahead of the crack .
断裂面从轴承部位外部开始延伸到整个截面。典型的是从圆弧部开始，常常会由于疲劳而产生的裂纹的扩展后引起的。
Fracture lines start from the outside and spread over the whole cross section, particularly starting in the fillet area and very often after a fatigue crack propagation.
按裂纹延伸长度，可分为宏开裂和微开裂。
Depending on their extension, a differentiation is made between macro and micro-crack.
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