疲劳

And then it uses stress amplitude method to check fatigue strength and estimates fatigue life of the main girders.

应用应力幅法对主梁进行了疲劳强度的计算和疲劳寿命的估算。

The results indicate that the thermal fatigue of the cast hot-work die steel is high-cycle thermal fatigue, therefore the main factor affecting thermal fatigue resistance is thermal strength and thermal stability.

随着V/C增加，热疲劳抗力先增后减，当V/C比为3.0时，组织中析出了细小弥散的VC，改善了钢的热强性和热稳定性，热疲劳抗力最高。

The fatigue stress induced by ice lead to fatigue damage of the platforms.

冰区海洋平台受到冰载荷作用会产生疲劳应力并造成构件的疲劳损伤。

Some of the specimens were interference fit tapered shank bolt connections, and the others were ordinary cylindrical shank bolt connections.

介绍了以7475 T761铝合金为基材的锥形螺栓干涉配合和普通螺栓非干涉配合连接的犬骨形试件，在随机疲劳载荷谱作用下的疲劳试验。

The results show that the fatigue fracture of the axis resulted from the sharp angle and the rough surface knife trace of the key slot and were accelerated by the badness metallurgy quality and the coarse austenite grains.

结果表明，中间轴断裂疲劳源起源于键槽尖角和表面粗糙的刀痕，而原材料冶金质量不良和粗大的奥氏体晶粒则加速了疲劳断裂过程。

First of all, the concept of S-N curve and the procedures of p-S-N curve fatigue test, data processing were introduced. And then, these procedures were taken into practice on 4 kinds of aluminum alloy welded joints: corner joint, butt joint, cruciform joints and double-sided lap joint.

文中首先介绍了S-N曲线的概念和p-S-N曲线疲劳试验方法和数据处理方法，并按照这些方法对角接、对接、十字接和双面搭接四种铝合金焊接接头试样进行了疲劳试验，得出了这四种焊接接头的中值S-N曲线和置信度为95%，存活率分别为90%、99%下的p-S-N曲线及其方程。

In this paper, after consulting vast amount of related literature, considering the long-cycle and low frequency of air temperature, I apply fatigue experiment of asphalt mixture under low temperature and low frequency to research on the thermal fatigue characteristic of asphalt mixture.

本研究在参阅了大量国内外的相关文献后，根据温度循环周期长、频率低的特点，采用沥青混合料的低温低频疲劳试验来研究沥青混合料的温度疲劳特性。

Chapter 2: Analysis the reasons and character of fatigue damage in long-span bridge.

第二章从理论上探讨结构疲劳破坏的原因，结构承受循环应力是影响结构抗疲劳能力的主要因素。

The former were formed by the long-timed and repeating contact of till gravel with the ice-bed, which produced the maximum shear in the certain depth of layer under the surface and brough about the cracks of static fatigue and contact fatigue.

平行裂隙的成因是冰碛石长期和反复与冰床接触，在冰床表层以下一定深度产生最大剪应力，沿平行冰岩界面使岩石出现静疲劳和接触疲劳破裂。

The fatigue life of ship structures is mostly dependent on the fatigue life of their weldments.

船舶结构的疲劳寿命取决于其焊接结构的疲劳寿命。

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。