The mechanical properties of the butt welded joints have been evaluated according to the impulsive and fracture toughness as well as the rate and threshold values of fatigue crack propagation.
根据试验测定的焊缝各区冲击韧性、断裂韧性、疲劳裂纹扩展速率和疲劳裂纹扩展门槛值，对焊缝力学性能作出综合评价。
The pre-straining prolonged the fatigue crack initiation life, and increased resistance coefficient and equivalent stress threshold of the fatigue crack initiation.
预应变可以延长疲劳裂纹形成寿命，提高疲劳裂纹形成的抗力系数和裂纹形成的当量应力门槛值；
A distribution function of two dimensional threshold is given for fatigue crack propagation. A two dimensional stress threshold interference model is set up.
本文给出二维疲劳裂纹扩展门槛值分布函数，建立二维应力—门槛值干涉模型。
The threshold of the fatigue crack initiation from the notch of the microbeam is close to that of the bulk material.
疲劳裂纹从尖缺口处萌生的门槛值接近块体材料。
A distribution function of two dimensional threshold is given for fatigue crack propagation.
本文给出二维疲劳裂纹扩展门槛值分布函数，建立二维应力—门槛值干涉模型。
Effect of experimental parameters on small fatigue crack growth threshold test in 9310 steel was investigated.
针对9310钢研究了试验参数对疲劳小裂纹门槛值测试结果的影响。
This paper presents a review of the characteristics and mechanisms of fatigue crack propagation(FCP)at near-threshold range in various metals and alloys.
本文回顾了各种金属及合金在门坎区附近的疲劳裂纹扩展的机制和特征。
Fatigue crack growth threshold is predicted based on materials cyclic plasticity.
基于材料的循环塑性预测了疲劳裂纹扩展的门槛值。
This paper presents a review of the characteristics and mechanisms of fatigue crack propagation at near-threshold range in various metals and alloys.
本文回顾了各种金属及合金在门坎区附近的疲劳裂纹扩展的机制和特征。
Tempering temperature remarkably affect the threshold value of fatigue crack propagation.
回火温度对该钢的疲劳裂纹门槛值影响显著。
Based on the features of the three-dimensional crack, an experimental method was presented to measure the near-threshold fatigue crack growth rate and threshold of the corner crack at a hole.
基于三维裂纹特征，本文提出了一种测量孔边角裂纹近门槛区疲劳裂纹扩展速率及门槛值的实验方法。
Particula emphasis has been devoted to the influence of load ratio and microstructure on behaviour of near-threshold fatigue crack growth.
着重分析了载荷比和显微结构对门坎值附近裂纹扩展行为的影响。
Particula emphasis has been devoted to the influence of load ratio and microstructure on behaviour of near-threshold fatigue crack growth.
着重分析了载荷比和显微结构对门坎值附近裂纹扩展行为的影响。
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