证实了位错塞积的存在及其对微裂纹形核的促进作用。
This verifies the existence of dislocation pile-up and its stimulation to the nucleation of microcracks.
缺口试样在缺口的高应力集中效应下，加快疲劳裂纹形核过程。
The high stress concentration effect of notch can accelerate the process of fatigue crack nucleation in the notch specimen.
当腐蚀促进的位错发射和运动达到临界状态时，应力腐蚀裂纹形核和扩展。
Microcracks of SCC initiated when the corrosion-enhanced dislocation emission and motion reached a certain condition.
裂纹形核主要是通过位错堆积、晶界角源及弹性各向异性三种机理产生的。
Nucleation of crack is due to dislocation pile-up mechanism and elastic anisotropy mechanism.
随循环温度和冷却速率的增加，裂纹形核的孕育期缩短，裂纹扩展速率增加。
The incubation period of crack nucleation decreases and the crack propagation rate increases with the increase of thermal cycling temperature and cooling rate in the cycle.
在第二个临界载荷下，三个判据都满足的区域相互重叠，解理裂纹形核并扩展。
Under the second critical load, the regions, where the three criteria are satisfied, are overlapped each other and cleavage crack is nucleated and propagates.
试验结果表明，随着循环温度的增高，裂纹形核孕育期缩短， 裂纹扩展速率增大；
The results have shown that the incubation period of crack nucleation decreases and the propagation rate of crack increases with increasing the cyclic temperature.
疲劳断口有应力发白现象；应力发白区为疲劳裂纹形核和萌生区，其寿命占疲劳总寿命的大部分；
The stress whitening can be clearly seen on the fatigue fracture surface and its region is the initiation and nucleation of fatigue crack which is the main part of total fatigue life.
拍摄了热疲劳裂纹的形核、成长、连接过程。
The nucleation, growth and connection of fatigue cracks were photographed.
采用压痕法及扫描电镜观察，研究了抗磨贝氏体球铁中裂纹的形核与扩展。
Crack nucleation and propagation in wear-resistant bainite ductile cast iron were investigated by press trace method and SEM.
论文的第二部分对微裂纹的形核机理及扩展机理进行了详细的阐述。
In second chapter, the mechanisms of crack nucleation and propagation are explained in detailed.
热冲击疲劳裂纹的形成与微孔洞的形核、长大和连通有关。
The crack formation of thermal shock fatigue is related to the nucleation, growth and join of microvoid.
结果还表明，随着夹杂物尺寸的增加，裂纹临界形核应变降低。
It is also showed that the critical strain values of crack nucleation decrease with the increase of the size of inclusions.
研究发现，硫含量对裂纹塑性形核功的影响最显著。
The results indicate that sulfur content has marked influence on the crack initiation energy.
试样表面的氧化腐蚀及氧化皮剥落均比次表层严重，表面的开裂也加速了次表层裂纹的形核和扩展。
Peeling of oxidation film and oxidation-decarbonization are more serious on the surface than on the sub-surface.
试样表面的氧化腐蚀及氧化皮剥落均比次表层严重，表面的开裂也加速了次表层裂纹的形核和扩展。
Peeling of oxidation film and oxidation-decarbonization are more serious on the surface than on the sub-surface.
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