疲劳强度

Monte Carlo method is the most popular all of these methods, but its efficiency is low.

在机械零件的疲劳强度计算过程中，也常常需要预测零件的疲

In other words, fatigue strength can be any value on the ordinate of the stress-cycles diagram.

也就是说，疲劳强度可以是应力循环图中纵坐标上的任意值。

Decreasing the parts' surface roughness, as it is shown after a long time practice that can realize the reliability and stabilization of the match; can reduce faction coefficient, wear, stress concentration, vibration, noises, and power consumption; can improve the operative precision and perceptivity; can increase the support area and contact intensity; and also can improve wear degree etc.

长期的生产实践表明，降低零件的表面粗糙度，对保证配合的可靠性和稳定性；对减少摩擦系数，降低动力消耗；对提高机械和仪器的工作精度和灵敏度；对增大支撑面积，减少磨损，提高接触刚度；对减少应力集中，增加耐疲劳强度，减少振动和噪声等均起着重要的作用：即表面粗糙度直接影响着机械和仪器的使用性能和使用寿命。

The limitations of probabilistic reliability of cylindrical spiral spring fatigue strengthen is indicated due to the lack of the original data.

指出在数据信息缺乏的情况下，圆柱螺旋弹簧疲劳强度概率可靠性分析方法的缺陷。

FA cycloid drive is uptodate transmission device in the world today. It is of higher fatigue intensity, higher rigidity, longer longevity and higher slewing precision than syntony wave reducer which was often used in the robot before, thus this kind of drive will be more and more used in industry robots besides general driver with high carrying capacity.

FA传动减速器是当今世界上最新发展的传动装置，较机器人常用的谐波传动有较高的疲劳强度、刚度和寿命，而且回差精度高；因此该种FA减速机除了普通传动中的高承载应用以外，在工业机器人传动中正在得到越来越多的应用。

What is taken account of includes the effects of the material, geometrical shape, manner of loading, ratio of cycle stress, residual stress and short crack in weld toe on fatigue strength.

该模型考虑了材料、几何形式、荷载形式、应力比、尺寸效应、残余应力及焊趾根部短裂纹等因素对疲劳强度的影响。

At the region of air ,for developing the fatigue strength and the using life of components , shot peening had been used for some important components , such as air engine vane、 undercarriage and aerofoil wainscot.

在航空领域，传统喷丸技术已经被广泛应用于一些重要零部件如航空发动机叶片、起落架和机翼壁板等的表面强化处理，以达到提高疲劳强度、延长零件使用寿命的目的。

The crankshaft is a forged steelwork and uses a full supporting structure, it is has superior wearability and fatigue strength.

曲轴为钢锻件，采用全支承结构，有很好的耐磨性和疲劳强度。

With the improvement of the structural complication and strength index of the engine structure, during the work process, the bending-shaft produce bent and torsion because of the action of periodicity variational air pressure, inertia pressure evocabled by the to-and-fro and whirligig motion and torque, therefore, engine bending-shaft must be provided with the preferable fatigue intensity and the structure rigidity through making use of the material of high intensity and the reasonable forging technique.

随着发动机结构的复杂化和强化指标的不断提高，曲轴在工作过程中，由于受到周期性变化的气压力、往复和旋转运动引起的惯性力以及弯矩、扭矩的共同作用，既产生弯曲又出现扭转，这就要求发动机曲轴具有高的疲劳强度和结构刚度。

Sliding bearing not only pass working force,but also sustain high surface velocity,which require the material to have soft parts,in order to obtain fine working behavior and difficulty to damnify by extra impurity,and have hard parts to acquire fine wearability and fatigue strength.

由于滑动轴承既要传递作用力又要承受很高的表面速度，这就要求轴承材料既要具有软组分，以获得良好的运行性能，如磨合性、顺应性以及尽可能小的咬和倾向，且不宜被外来杂质所损伤；又要具有硬组分，以获得良好的耐磨性和抗疲劳强度。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。