我们特别把注意力集中在裂纹扩张过程中的不稳定现象上。
Special attention has been focused on the instability phenomenon associated with 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.
PEN薄带的微观磨损机理主要是纤维组织的塑性流动和拉断，而PI薄带的微观磨损机理为裂纹的萌生、扩张和块状剥落。
The micro wear mechanism for PEN is plastic flow and broken of the fiber structure, while that for PI is crack initiation, extending and block fracture.
分析了冷扩张对疲劳裂纹尖端应力强度因子分布的影响。
The influence of cold expansion on the stress intensity factor distribution in crack tip was also analyzed.
着重温度对气门材料的力学性能、蠕变和疲劳裂纹形成与扩张的影响等问题进行分析和研究。
The study work is focused on the effect of temperature upon mechanical properties, creep, initiation and propagation of fatigue crack for the valve material.
着重温度对气门材料的力学性能、蠕变和疲劳裂纹形成与扩张的影响等问题进行分析和研究。
The study work is focused on the effect of temperature upon mechanical properties, creep, initiation and propagation of fatigue crack for the valve material.
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