疲劳

Factors that influence fatigue life of chain plate are determined with experimental methods. Factors to raise life of chain plate are analyzed with theoretical methods.

用试验方法确定了挤孔对链板疲劳寿命的影响，从理论上分析了在最佳挤孔量下链板疲劳寿命提高的因素。

The test of coffin model thermal-fatigue in notched plate specimen of the4Cr5MoSiV1 steel has been made, by self-made testing machine of the highfrequency heating and the draught quenching.

利用自制的高频感应加热、吹风冷却式试验机，对4Cr5MoSiVl钢缺口板状试样进行了Coffin型热疲劳试验。记录了热循环次数、热疲劳裂纹长度、试样中热应力变化之间的关系。

In order to prolong the service life of roller bearing, a deep end-cavity roller is applied to roller bearing of cone bits.

国内现有牙轮钻头滚动轴承多采用短圆柱滚子轴承结构，滚子边缘处存在应力集中现象，使得轴承接触表面极易发生疲劳破坏，为提高牙轮钻头滚动轴承抗接触疲劳寿命，提出在牙轮钻头滚动轴承中采用凹端圆柱滚子的方案。

In China, the roller bearing cone bit is now equipped with short cylindrical roller, which has stress centralization on the edge, and it easily causes fatigue failure on the contact area.

国内现有牙轮钻头滚动轴承多采用短圆柱滚子轴承结构，滚子边缘处存在应力集中现象，使得轴承接触表面极易发生疲劳破坏，为提高牙轮钻头滚动轴承杭接触疲劳寿命，提出在牙轮钻头滚动轴承中来用凹端圆柱滚子的方案。

In China, the roller bearing cone bit is now equipped with short cylindrical roller, which has stress centralization on the edge, and it easily causes fatigue failure on the contact area.

国内现有牙轮钻头滚动轴承多采用短圆柱滚子轴承结构，滚子边缘处存在应力集中现象，使得轴承接触表面极易发生疲劳破坏，为提高牙轮钻头滚动轴承抗接触疲劳寿命，提出在牙轮钻头滚动轴承中采用凹端圆柱滚子的方案。

Micro-computer cool head adopts the world's most advanced quantum theory of light emanating from the development, the micro-spectroscopy, to the center cone retinal cells function, like eyes continued to add energy the direct effect of the mobilization of visual function, raise anti-fatigue, in the course of a computer eyestrain slowed moment, improve learning efficiency.

微量子电脑爽目仪采用世界先进的微光量子原理研制而成，其发出的微量子光谱，有利于视网膜中心视锥细胞功能的发挥，如同持续给眼睛补充能量，直接起到调动视觉功能、提高抗疲劳能力，在用电脑过程中时刻减缓眼睛疲劳，提高工作学习效率。

Based on the analysis of the main failures discovered in pavement on steel deck plate and the demanding service condition of the pavement on steel deck,high-temperature rutting test,low-temperature bending test and controlled stress flexural fatigue test are used to study the performance of asphalt mixtures modified by epoxy resin including high-temperature stability,low-temperature cracking-resistance,and fatigue cracking-resistance,which are served to evaluate the modification effect of epoxy resin of different contents.

文摘：在分析钢桥面铺装层主要病害和特殊工作环境的前提下，分别采用高温车辙试验、低温小梁弯曲试验和控制应力小梁弯拉疲劳试验，研究了不同环氧树脂掺量下的环氧树脂改性沥青混合料的高温稳定性、低温抗裂性和抗疲劳性能。

Based on the analysis of the main failures discovered in pavement on steel deck plate and the demanding service condition of the pavement on steel deck,high-temperature rutting test,low-temperature bending test and controlled stress flexural fatigue test are used to study the performance of asphalt mixtures modified by epoxy resin including high-temperature stability,low-temperature cracking-resistance,and fatigue cracking-resistance,which are served to evaluate the modification effect of epoxy resin of different contents.

在分析钢桥面铺装层主要病害和特殊工作环境的前提下，分别采用高温车辙试验、低温小梁弯曲试验和控制应力小梁弯拉疲劳试验，研究了不同环氧树脂掺量下的环氧树脂改性沥青混合料的高温稳定性、低温抗裂性和抗疲劳性能。

And through the double-loaded fatigue experiments, the results fit well with the model.

含孔复合材料层合板的疲劳行为试验研究结果表明，该复合材料含孔层合板具有优越的拉-拉疲劳性能，在高应力水平以下能够经历106以上的载荷循环，且无明显目测损伤。

Fretting fatigue ; life prediction ; low cycle fatigue ; dovetail joint ; nominal stress method

微动疲劳；寿命预测；低周疲劳；燕尾榫；名义应力法

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。