疲劳

With K and D describing the random event, the dissertation has established a new cumulative fatigue damage model expressed by probability.

用K和D描述疲劳失效随机事件，本文建立了新的用概率描述的疲劳累积损伤模型。

These have not olny made it possible to experiment with random load sequence, but also provided conditions for stochastic fatigue theory analysis in our country.

这部分内容不仅使今后在我国随机载荷疲劳试验成为可能，也为随机载荷疲劳理论分析提供了条件。

It is successful to obtain the S-N curve by linear regression from the relative coefficient of low temperature fatigue experimental data. Different safety fatigue life can be estimated according to different safety probability.

从低温疲劳实验的相关系数可以看出，用线性拟合来回归中值S-N曲线是成功的，而且根据不同的安全概率，可以计算出不同的安全疲劳寿命。

The failure of a turbine axes was investigated by sclerometer,optical microscopy,SEM,and mechanics analyses.

通过硬度检测、金相检验、宏观及微观断口分析，结合力学分析证实了汽轮机轴失效是由于轴肩变径处加工刀痕导致应力集中，造成多条疲劳裂纹萌生、扩展及最终的断裂，提出了防止汽轮机轴疲劳断裂的措施。

The results make it known that: in the same cycle degree, the crack propagation depth of finite element is greater than experiments, the inaccuracy between expriments and computer simulation tracing is lower than 10%, the tracing conclusion is securer than the experimental one; both directions of crack propagation are not identical.

当接管区出现裂纹时，则在疲劳载荷的作用下会加速扩展，从而降低设备的使用寿命，并且可能发生一些毫无征兆的事故。因而研究并掌握接管区表面裂纹的疲劳扩展特性对于预防接管区的失效破坏具有一定的学术和工程价值。

Methods: Thirty-four healthy college students were exhausted by exertion riding and their heart and lung functions were monitored. Blood pressure, sphygmogram and blood lactic acid were measured before and after riding; ratings of perceived exertion and symptom scores were enrolled to assess motion fatigue.

对34名健康大学生应用功率自行车进行力竭运动造模，同步连续监测心肺功能；分别于运动前后检测血压、脉图、血乳酸指标，并设计应用"运动性疲劳主客观评分表"，包括自我感觉疲劳程度和客观症状评分两部分，对运动状况进行评价和记录。

ST5BZThe effect of the temperature of shape memory treatment,cold working rate and shot-peening process on the fatigue limit of Ti-50.2Ni shape memory alloy spiral spring had been studied by differential scanning calorimetry and thermal cycling fatigue test.

利用示差扫描热分析仪和热循环疲劳试验，研究了形状记忆处理温度、冷加工率和喷丸工艺对Ti 50 2Ni形状记忆合金弹簧疲劳寿命的影响。

As a result of characteristic of function of material of steeliness bearing oneself, the main form of bearing invalidation is exhaustion flakes, fatigue life limits of short, application gets very big limitation.

由于钢制轴承自身材料性能特点，轴承失效的主要形式是疲劳剥落、疲劳寿命短、应用范围受到很大限制。而陶瓷材料si3。。。。。。

Connecting of doubler strake is a relatively weak link, fatigue strength of which is largely reduced due to the influence of the weld flaw, weld inside stress and weld surface figure. If the ship is under the alternate load function for a long time in long service, fatigue destruction of connecting may happen, strength of deck plating or bottom plating strengthened may also be influenced.

复板条的对接接头是一个相对薄弱的环节，由于焊缝缺陷、焊接内应力、焊缝表面形状等因素的影响，使得接头的疲劳强度大幅度降低，船舶在营运过程中长期受到交变载荷的作用，就会引起对接接头的疲劳破坏，继而影响到被加强的甲板或船底板。

First, a few methods of fatigue experiment, the structure theorem of thefatigue experiment machine and some basal conception and theorem are assaiedideally.

首先，从理论上分析了几种疲劳试验方法，以及疲劳试验机的结构原理和计算机控制的一些基本概念和理论。

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。