疲劳

In the research of high cycle fatigue of concrete, the test means of cyclic loading between the set constant or various upper limit and low limit of force or stress has been extensively used. But this kind of test means can't be used to study the behavior of concrete low cycle fatigue under large strain.

同时高周疲劳问题研究中使用的在设定的力或应力的上下界限之间重复受力的试验方法已无法用于混凝土高应变低周疲劳性能的试验研究。

Secondly the fatigue test is carried out under the constant amplitude cyclic loading for the specimens which are exposed in the corrosive environment for equivalent calendar time of zero year, 3 years, 8 years and 13 years.

飞机结构日历寿命的确定与腐蚀环境对飞机结构寿命的影响紧密相连，材料抗疲劳性能随日历年限的变化规律和腐蚀环境作用后的疲劳累积损伤理论是科学地确定飞机结构日历寿命的基础。

The results show that:there are obvious cyclic creep behaviour during constant stress amplitude low-cycle fatigue in 62Sn-36Pb-2Ag surface mount solder joints.

研究了表面封装焊在剪切应力作用下等温低周疲劳特征，得到疲劳寿命与循环应力幅的关系曲线。

In order to study the fatigue of pressure vessel commonly encountered problem in engineering with large destructibility , based on the theory of fracture mechanics , the pressure vessel existing original crack was equivalent to the problem of infinite flat with center crack .

为了分析工程中常见的破坏性极大的压力容器疲劳问题，基于断裂力学理论将存在初始裂纹的压力容器等效为无穷远处作用均匀拉应力的含中心裂纹无限大板问题，解出表面半椭圆裂纹和穿透裂纹的应力强度因子；利用断裂判据得到裂纹的临界断裂尺寸；采用Paris表达式对裂纹扩展速率进行描述，推导出初始裂纹在不同裂纹尺寸和形式下的裂纹疲劳扩展寿命。

The lifetime prediction with increases in switch cycles is strongly dependent upon the device dimensions and characteristics of structural thin films. Thus, understanding of fundamental observed failure mechanism and mechanical response respected to external loads plays an important role in products design and lifetime prediction of MEMS.

因材料的疲劳行为发生时并无任何明显的外观改变，而是一种潜在的行为，且没有明显的塑性变形区，对元件的安全以及寿命的影响更是无法明显观察并加以预防，因此可藉由疲劳试验来预测元件之寿命，并进一步对元件进行防范和更替的动作。

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。

But it was her habit at this period to carry exhaustion to the furthest point and confess to it only when dissimulation broke down.

但这时期她已养成习惯，不把疲劳当一回事，非到忍无可忍、无法掩饰的时候，不会承认疲劳。

In order to make best of efficiency of composite material in different conditions, testing of samples in distilled

其中水分环境是重要的因素之一，本文还针对T300/HT3进行了浸泡水后的疲劳性能试验，对水分对复合材料疲劳性能影响进行了初步的分析及研究。

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。

Driving in case of drowse is a most important factor of traffic accidents. Now many countries are active in studying drowsy monitor.

汽车司机疲劳驾驶是引发交通事故的一个重要原因，许多国家正积极进行疲劳状态检测系统的研究开发工作。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了