疲劳强度

The statistical analysis of experiment results shows that both of the fatigue life and the strength performance of several composites in common use follow the logarithmic normal distribution or Weibull distribution, thus their probability models are given.

文中通过对几种常用复合材料的实验结果统计分析，发现复合材料疲劳寿命和强度性能遵循对数正态分布或Weibull分布，从而建立其概率模型，并寻求到强度性能的最大标准差，为复合材料可靠性设计奠定了基础。

The two phenomena have the common characteristic that they are a monotonic function of time inducing a systematic decrease of strength.

船体强度的退化是腐蚀和疲劳共同作用的结果，这两种现象具有一个共同的特征，即它们都能导致船体梁强度随时间单调退化。

An engineering procedure for estimating crack growth behavior and fatigue lives of semielliptical surface cracks at weld toe s in complex stress fields was proposed based on a database of stress intensity factors and the elementary modes method developed by author.

以作者建立的焊趾半椭圆表面裂纹应力强度因子数据库以及复杂应力场中焊趾半椭圆表面裂纹前缘应力强度因子分布计算的基本模式法为基础，给出了复杂应力场中焊趾表面裂纹在疲劳扩展过程中形态变化规律及寿命的工程分析方法；并用这个方法计算了一些典型焊接接头在一些典型的外加应力场和残余应力场中的裂纹形态发展曲线。

RCF is an ideal method that can quantifiably evaluate the bonding strength. However, small balls are necessary for thin films.

滚动接触疲劳法能够得到膜基界面强度的定量值，是比较理想的结合强度测试方法。

It seems quite likely that the strength training carried out by Hickson's charges improved fatigue resistance in their muscles, permitting them to persist longer both during high-intensity tests of endurance and prolonged efforts at a submaximal (80% V02max) intensity.

看来很有可能的力量训练进行了希克森的收费提高抗疲劳的肌肉，允许他们坚持更长期间高强度的耐力试验和长期的努力，在亚（ 80 ％ V02max ）强度。

The results show that the stress of clack box is lower than the yield limit of the material. The safety factor is between 1.8 and 3.2, and the distortion of clack box is in the permission scope. The static strength and stiffness satisfy the request, and the life of clack box exceeds 107, which meets the requirements.

研究结果表明，在3种载荷工况作用下阀箱应力均低于材料的屈服强度，其安全系数为1.8~3.2，且阀箱的变形在允许范围之内，阀箱静强度及刚度满足要求；阀箱疲劳寿命大于107，也满足要求。

Surprisingly, the low-intensity group had a greater reduction in fatigue levels than the moderate-intensity group, 65 percent compared to 49 percent, respectively.

令人惊讶的是，低强度组有较大减少，在疲劳的水平比中等强度组， 65 ％相比，到49 ％，分别为。

Various kinds of steel such as structure steel, tool steel, pipe line steel, reinforcing steel bar, common engineering steel and cast iron may be improved in their properties by vanadium nitrides and carbides.

已有的研究表明碳氮化钒添加于钢中能提高钢的耐磨性、耐腐性、韧性、强度、延展性和硬度以及抗热疲劳性等综合机械性能，并使钢具有良好的可焊接性能，而且它能起到消除夹杂物等作用，在高强度低合金钢中的应用效果更加明显。

In recent years, due to the casting level, more and more like, bottom-mode, frame type, such as using higher strength and wear resistance of ductile iron or high-strength alloy cast iron production, and heat fatigue The better performance of graphite cast iron have been used for the production of hot-box material.

近几年来，由于铸造水平的提高，已有越来越多的模样、模底板、型板框等采用强度和耐磨性更高的球铁或高强度合金灰铸铁制作，而耐热疲劳性能更好的蠕墨铸铁也被用于制作热芯盒材料。

UGA.edu - Sedentary people who regularly complain of fatigue can increase their energy levels by 20 percent and decrease their fatigue by 65 percent by engaging in regular, low intensity exercise, according to a new University of Georgia study.

uga.edu -久坐的人谁经常抱怨的疲劳可以增加他们的能量水平由2 0％和减少他们的疲劳由6 5％，从事经常性，低强度运动，根据一项新的乔治亚大学的研究。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。