The fatigue crack initiation behaviour and its mechanism were investigated.
研究它们在循环加载下的疲劳裂纹萌生行为及其机制。
The methods of fatigue crack initiation life predictions under complex load are introduced in this paper.
介绍了复杂载荷下疲劳裂纹形成寿命预测的方法。
Finally, examples are given for predicting the fatigue crack initiation life from the tensile properties of steels.
最后给出了根据钢的拉伸性能估算疲劳裂纹起始寿命的实例。
The fractography of the fatigue crack initiation displayed cleavage facet and more second cracks after pre-training.
裂纹形成的断裂为穿晶解理机制，预应变可导致更多的二次裂纹。
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。
Moreover, the study indicated that the fatigue crack initiation period is the main portion of the total fatigue life at long lives.
该研究还表明，在长寿命范围，裂纹起始寿命是疲劳全寿命的主要部分。
Burning underground will change the surface of microstructure of BHA, and accelerate corrosion and fatigue crack initiation and propagation;
③井下发生燃爆，会改变下部钻具表面的金相组织，加速了腐蚀和疲劳裂纹萌生、扩展；
The fatigue fractography consists of several different zones, including fatigue crack initiation, slow, fast propagation and final fracture.
疲劳断口上存在典型的疲劳裂纹萌生区、缓慢扩展区、快速扩展区和最后瞬断区。
Corrosion pitting also can lead to fatigue crack initiation depending on the component, the location of pitting, and cyclic loading conditions.
腐蚀斑点还会因不同的部件、斑点的位置和循环载荷状况，导致一些不同的疲劳裂纹。
Fatigue beaked on weld seam more than other places. Fatigue crack initiation occurred inside materials and fatigue fracture was analyzed by SEM.
疲劳试验发现，疲劳试样断裂位置多发生在焊缝处，并对疲劳断口进行了SEM分析。
The fatigue crack initiation life for standard titanium alloy TC6 specimens is predicted, and the result is consistent with that of the experiment.
利用该方法预估了TC 6钛合金标准件疲劳裂纹萌生寿命，其结果与试验数据吻合。
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；
The fatigue crack initiation life of 300M steel is experimentally investigated and a simple method for predicting the fatigue crack initiation life of materia is offered.
测定了300M钢的缺口疲劳始裂寿命曲线，给出了估算疲劳始裂寿命的方法。
The result shows: the local residual tensile stress and cyclic compressive loading thrust fatigue crack initiation and propagation in the size of compressive plastic zone.
结果表明，疲劳裂纹是在残余拉应力和循环压应力作用下萌生和扩展的，压塑性变形是裂纹萌生和扩展的必要条件。
A calculating method of the total fatigue life of structural joints is proposed based on a study on both the fatigue crack initiation life and crack growth life of joints.
通过对结构疲劳裂纹形成寿命和裂纹扩展寿命的研究，提出了连接件疲劳全寿命的计算方法。
It is concluded that, the residual stress induced by cold expansion can maintain enough strength to prevent and retard fatigue crack initiation and growth in rail bolt hole.
结果表明，冷扩张过程所引入的切向残余压应力能保持足够的强度，以对钢轨螺栓孔起到显著的防裂和止裂作用。
Experiments demonstrate that leaf spring crack results from rust spot as fatigue crack initiation, and in order to improve spring life it must be to improve coating quality.
通过试验证明了锈点是导致钢板弹簧断裂的新的疲劳源，为提高弹簧的使用寿命必须提高其涂层质量。
The fatigue crack initiation life for pipeline connection assemblies is also predicted. The fatigue crack propagation path is analyzed and the fatigue crack propagation life is predicted.
进一步，预估了管路连接件裂纹萌生寿命，预测了裂纹扩展路径并预估了疲劳裂纹扩展寿命。
Fatigue crack initiation is an important period in the whole fatigue life. The damage regularity of crack initial period cannot estimate with fracture mechanics which is used in large crack.
疲劳裂纹萌生阶段在整个疲劳破坏过程中占有极为重要的地位，而萌生阶段的裂纹体损伤规律用长裂纹断裂力学方法是无法确定的。
The superiority of this design over the conventional one will reveal itself in the studies on the mechanisms of crack initiation and growth in fatigue process under bending condition.
这种等应力试样在研究弯曲疲劳，尤其是在弯曲条件下研究疲劳过程中裂纹产生和扩展机理时，将显示出明显的优越性。
The primary failure model is fatigue fracture that is always resulted by the crack initiation and propagation.
疲劳断裂是气门弹簧失效的主要模式，它是疲劳裂纹萌生及其扩展的结果。
The results show that the fracture mode of blade is vibration fatigue and the main cause of initiation of fatigue crack is the mismatch between rabbet and tongue-and-groove.
结果表明，叶片的断裂模式为振动疲劳，叶片榫头与榫槽配合不当是萌生疲劳裂纹的主要原因。
It is indicated that retained austenite in microstructure can inhibit the initiation and propagation of fatigue crack, improve the resistance to impact fatigue and decrease impact fatigue wear.
试验得出，残余奥氏体可阻止疲劳裂纹的萌生和扩展，提高冲击疲劳抗力，降低冲击疲劳磨损。
The results showed that manufacturing defects of the bolt resulted in initiation and propagation of fatigue crack, and uneven loading of the bolt speeded up failure process of fatigue fracture.
确认螺栓机加工不当引起疲劳裂纹的萌生及扩展，加之螺栓受力不均匀加速了疲劳断裂过程。
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。
On constant frequency ratio, loading ratio has an importance influence on the initiation and propagation of fatigue crack under double frequency complex loading.
在频率比确定的条件下，载荷比是影响双频疲劳裂纹萌生及扩展的一个重要因素。
The initiation stage and short crack behaviour in torsional fatigue of medium carbon steel was investigated by using a replication technique.
通过扭转疲劳试验和塑料复型膜技术研究了中碳钢试样的疲劳短裂纹特性。
The fatigue limits for crack initiation and fracture were predicted and the predicted values agreed well with the experimental results.
预测了疲劳裂纹的萌生和断裂极限，预测值和实验值相当一致。
The fatigue limits for crack initiation and fracture were predicted and the predicted values agreed well with the experimental results.
预测了疲劳裂纹的萌生和断裂极限，预测值和实验值相当一致。
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