They are fatigue cracks which is mainly caused by alternating stress.
叶片裂纹是疲劳裂纹，主要由交变应力引起。
Alternating stress not only varies in magnitude but also in direction.
角变应力不仅大小变化，而且方向也变化。
Alternating stress produced by alternating dynamic ice force evidently results in the partial fatigue failure.
交变冰力引起的结构交变应力必将导致结构的局部疲劳损伤。
It revealed that alternating stress in long time cause the bolt fatigue failure, meanwhile the failure process was also effected by superheating steam.
认为主要原因是螺栓在长期服役中受交变应力引起疲劳失效所致。过热蒸汽介质对疲劳失效有影响。
The Corrosive fatigue damage of concrete is the result of the compound action of alternating stress and corrosion medium, and the study about this has just been.
混凝土腐蚀疲劳破坏是交变应力与腐蚀介质耦合作用的结果，对其研究目前国内外还仅出于理论探索阶段。
The main reason for the fatigue fracture of material is that the specimens under action of alternating stress engender slip, finally resulting in dislocation stacking.
材料疲劳断裂主要是因为试样在交变应力的作用下上产生滑移最后致使位错塞积而导致的。
Further increasing modulation period leads to the emerge of incoherent interface and the destroy of alternating stress field, accompanied by the decreased mechanical properties.
进一步增加调制周期，两调制层之间产生非共格界面，破坏了薄膜中的交变应力场，薄膜的硬度和弹性模量也随之降低。
Prestressed steel wire and strand for bridge are used in the condition of high alternating stress with humidity atmosphere and sometime seawater atmosphere, which speed up the corrosion.
桥梁用预应力钢丝钢绞线都在高的交变应力状态下服役，加上海水、潮湿环境的影响，更加速其应力腐蚀的速率。
Under act of the alternating thermal stress, thermal fatigue is one of theprimary invalidity forms of cast iron workpiece.
在热交变应力的作用下，热疲劳是铸铁工件的主要失效形式之一。
Bearing contact fatigue failure of the working surface by means of alternating the role of stress arising from failure.
接触疲劳失效系指轴承工作表面受到交变应力的作用而产生失效。
The crack appears at the edge angle due to stress concentration caused by alternating load, which finally leads to the fissuring of die plate.
凹模在使用过程中，由于交变载荷的作用，使碳化物的棱角处应力集中出现裂纹，最终导致凹模开裂。
These accommodation transformation systems have mainly been caused by the tectonic stress fields that lead to the alternating occurrence of compressional subsidence and nappe uplifting.
这些可容空间转换系统主要是由于构造应力场的挤压沉降作用和推覆隆升作用在平面上的交互出现所致。
Itsubject, alternating the tension pression stress, the bending stress.
它既受、交变的拉压应力、又受弯曲应力。
The shorter the direction-change time, the greater will be the influence of the stress alternating effect.
换向时间越短，应力交替作用的影响越大。
Stress-strain curve at slow loading-rate obtained in alternating loading rate test is shifted along the unloading curves, and then it overlapped on stress-strain curve at a fast loading rate.
将在交替变换荷载速率试验中得到的对应于低荷载速率的应力–应变曲线沿着卸载曲线平移，可以与高荷载速率对应的应力–应变曲线重合。
Stress-strain curve at slow loading-rate obtained in alternating loading rate test is shifted along the unloading curves, and then it overlapped on stress-strain curve at a fast loading rate.
将在交替变换荷载速率试验中得到的对应于低荷载速率的应力–应变曲线沿着卸载曲线平移，可以与高荷载速率对应的应力–应变曲线重合。
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