查询词典 fatigue of metal

Median fatigue life is usually used to estimate the fatigue properties of materials while the dispersibility of the data is always ignored.

目前，在评价材料的疲劳强度时，往往只注重比较材料的中值疲劳寿命，而忽略了对数据分散性的比较。

They found that more than 80% of the failures can be attributed to fatigue or fatigue related failures and most of them occur at the screwed joint of the drill collar.

石油管材研究所对近几年失效事故进行分析，有80％以上失效属于疲劳或与疲劳相关的失效，其中绝大部分发生在钻铤的螺纹联接处用。

The change of elastic modulus and stress associated with fatigue cyclic number was investigated during low cycle fatigue.

考察了低周疲劳过程中的弹性模量和应力随循环次数的变化。

RESULTS:A fatigue determination system which was able to determine effectively the examinee's fatigue state was established.

结果：搭建了一套疲劳检测系统，可有效地得到被试者的疲劳状态。

In this paper, the relationship between the fatigue crack front straightness S t and fatigue loading ratio f were explored.

通过实验，研究了疲劳裂纹前沿平直度 St与疲劳载荷比 f 之间的关系，发现两者高度正相关，为预制具有平直裂纹前沿的疲劳裂纹提供了有效的途径和方

The effects of anti fatigue and oxygen deficient durable under normal atmospheric pressure of Fomes Officinalis Ames were observed in the fatigue test and oxygen deficient durable experiment in mice.

本研究采用抗应激实验的方法，观察新疆药用层孔菌对小鼠抗疲劳能力以及耐常压缺氧能力的影响，比较给药组与对照组小鼠存活的时间，对测试结果的方差分析及多重比较表明，药用层孔菌具有很好的补益作用，能增加小鼠的抗应激能力，同样条件下能延长小鼠的存活时

Experiments are conducted to determine the gigacycle fatigue behavior of nodular cast iron GS51 by ultrasonic fatigue test system.

应用超声疲劳试验技术，完成了20kHz频率下(R=-1，R=0 1)的疲劳试验，获得球墨铸铁GS51在亿周次范围内的疲劳性能。

Experiments were conducted to determine the gigacycle fatigue behavior of cast Aluminum AS5U3G-Y35 by ultrasonic fatigue test system.

应用20kHz频率下的超声疲劳设备完成亿周次疲劳试验，获得铸铝AS5U3G-Y35超高周疲劳特性。

The test equipment, installation and test principle of gigacycle friction fatigue were introduced in this paper,On the basis of the fatigue test apparatus of 20 KHz ultrasonic vibration,the frequency value,the dimension calculation formulas and the specific shape of the specimen were given.

介绍了高周摩擦疲劳试验设备、装置及试验原理根据 2 0 0 0 0Hz超声波震动疲劳试验机的要求，给出了试件的频率值、尺寸计算、公式和具体形状；最后，给出了摩擦力、应力与位移的表达形式和疲劳寿命的记录方

Fatigue cracks develop in the shape of semi-ellipse, and the pattern of fatigue crack growth looks like headstand Y with the head pointing at the origin of the cracks.

疲劳裂纹源和裂纹扩展区部分的图像呈放射状的人字形条纹，人字纹指向裂源，其反向为裂纹的扩展方向。

Green function defined inphase space differs from one in coordinate space by its struc-ture which exhibits nonlocatity in coordinates and oscillatorybehavior with respect to momenta.

在相空间中定义的Green函数不同于通常坐标空间的Green函数，在结构上显示出对坐标的高度非局域性，而对动量则显示出振荡行为。

The upper front part of a saddle;a saddlebow.

前鞍桥马鞍前面的上部分；前鞍桥