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.
此结果支持了基于绝对反应速率理论的光纤断裂模型，并预测了裂纹扩张速率与外部应力强度的关系。
This result supports previous fracture models that are based on absolute reaction rate theory and predicts an exponential dependence of crack extension rate on applied stress intensity.
如此，藉由覆层补强金属的增设，可有 效增加结构强度，对抗外部应力防止断裂。
Therefore, by means of the additional arrangement of the coated reinforced metal, the strength of the structure can be effectively improved to resist external stress and prevent cracking.
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