根据裂纹扩展方式的变化，对氢致裂纹萌生和扩展机制进行了讨论。
According to the mode of crack propagation the mechanism of crack initiation and propagation was also discussed.
分析了制动盘裂纹剖面的宏观形貌特征，并对制动盘裂纹萌生和扩展机理进行探讨。
The feature of macro-profile is analyzed, and the crack initiation and extending mechanism of brake disc is discussed.
利用三维有限元模拟和动态响应试验对点焊接头疲劳裂纹萌生和扩展特性进行了研究。
Fatigue crack characteristics are investigated based on the dynamic response simulation by finite element and the dynamic response experiments for tensile-shear spot-welded specimens.
在热裂纹萌生和扩展的同时伴随着氧化腐蚀，氧化腐蚀缩短裂纹的孕育期，促进裂纹的萌生。
There is oxidation and corrosion in the incubation and propagation of cracks, which shorten the incubation period of crack and promote the crack to incubate.
解理断裂是典型的脆性断裂，解理断裂也是一个裂纹萌生和扩展的过程，其机制与位错和晶粒有关。
Cleavage fracture is a typical brittle fracture and also a process consisted of crack producing and spreading, and the mechanism is related to dislocation and crystalline grain.
随着阴极电位降低，不断增加的氢影响裂纹萌生和扩展，应力腐蚀敏感性随外加电位的降低而增大。
When the cathodic potential decreases, more and more hydrogen affects the initiation and growth of crack. The SCC susceptibility increases with the decreasing of cathodic potential.
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。
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.
研究结果表明，三维裂纹间的相互作用对裂纹萌生和扩展主要有两种影响，即相互促进或彼此抑制，裂纹演化过程中其空间位置起主要作用。
It is found that for 3d surface cracks, the interactions of cracks affect crack growth and extension in two aspects, i. e. the interaction either prompting crack extension or restraining it.
结果表明：珠光体裂纹萌生与扩展方式取决于珠光体层片和拉伸轴的位向关系。
The results indicate that the crack initiation and propagation mechanism depends on the orientation of pearlite lamellae with respect to the tensile axis.
对塑性变形过程、裂纹的萌生和扩展过程以及冲击过程的声发射特点及其内部成因也做了深入的分析。
In the process of plastic deformation, crack initiation and growth, and impact, the characteristics of acoustic emission (AE) signals and the factors that affect them are also elaborately discussed.
结果表明，电位扫描速度和电位阶跃频率对裂纹萌生与扩展有显著影响。
The results indicated that potential scan rate and step frequency played an essential role in the initiation and propagation of crack.
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。
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.
试样寿命主要由裂纹萌生寿命和断裂寿命组成，扩展寿命所占比例较少。
The crack initiation life and the crack fracture life are the main life of the specimen.
疲劳裂纹的萌生和扩展是材料在变载荷作用下的主要失效形式。
The origination and propagation of fatigue crack in materials under variable load is the main style of failure.
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。
The fatigue fractography consists of several different zones, including fatigue crack initiation, slow, fast propagation and final fracture.
观测了裂纹的萌生和扩展。
裂纹缺陷促进了裂纹的萌生和扩展。
围压则可以抑制裂纹的萌生和扩展，强化了微元体的承载能力，使得割线模量会增加。
While the confining pressure will inhibit the initiation and propagation of cracks, consolidate the carrying capacity of microelement and enhance the secant modulus of rock.
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；
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；
Burning underground will change the surface of microstructure of BHA, and accelerate corrosion and fatigue crack initiation and propagation;
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