裂纹

Experimental accuracy and repetition of FBG temperature sensitivity and compensation were discussed.have selected several materials which has bigger coefficient of expansion to do packaging components, have made many temperature experiments, there have not flaws, such as aging, crackle, absciss layer, packaging materials have good temperature sensitivity and compatibility with optical fiber;have designed the simple and practical packaging components, have performed a serials of experiments about accuracy and repetition of FBG wave-length, have obtained the first step conclusion;have analyzed the result and made comparison between the result of different experiment, have summarized the best packaging effect and several rules to reduce mistskes.

本文所做的主要工作包括以下几个内容：一、选取了常见的热膨胀系数大的材料制作封装元件，经过多次一80℃到80℃反复测试，封装元件没有出现老化开裂、封装裂纹、空洞、离层等缺陷，封装材料具有良好的温敏稳定性及复用性，与光纤相容性较好；二、对光纤光栅进行简单、实用的封装处理，就封装效果的优劣性、波长测量的准确度、重复性和封装时产生的波长损失等方面进行了一系列的实验，得出了初步的结论；三、对温敏和温度补偿式封装的实验数据进行了详细的分析和对比，从数字上对温变过程中光纤光栅中心波长的改变及温变曲线进行了定量的分析，在大量实验数据分析结果的基础上，总结出哪种材料封装效果更好，以及如何有效的减小实验误差。

According to quality problems of wall,it analyzes causes of cracks、scumming and abscission in mass cement sand pulp wall plastering ,and puts forward prevention measures to ensure beautiful view of wall.

针对工程墙面存在质量病害的现象，分析了大面积水泥砂浆墙面抹灰出现裂纹、泛霜、脱落的原因，介绍了其防治措施，以保证墙面的美观效果。

Center-cracked aluminum alloy plate s were adhesively one-side bonded with unidirectional carbon/ epoxy composite patches by vacuum-bagging process.

利用袋压工艺、采用单向碳纤维/环氧复合材料补片对含中心裂纹的铝合金板进行了修补，测试了胶接修补前后板的静态力学性能和疲劳性能。

Center-cracked aluminum alloy plates were adhesively one-side bonded with unidirectional carbon/ epoxy composite patch es by vacuum-bagging process.

利用袋压工艺、采用单向碳纤维/环氧复合材料补片对含中心裂纹的铝合金板进行了修补，测试了胶接修补前后板的静态力学性能和疲劳性能。

Regarding anisotropic material (including orthogonal aeolotropy) crack expansion question analysis and research, the people although have done the massive research work, but accumulates data is actually limited.

对于各向异性介质中裂纹扩展问题的分析和研究，人们虽已做过大量的研究工作，但所积累的资料却十分有限。

This method can be applied in the fatigue crack prevention of the aerofoil root.

该方法可应用于飞机机翼疲劳裂纹的止裂中。

As an example, the relationship between the creep crack growth rate da/dt in a 2. 25 Cr-1 Mo steel at 565℃ and the C~* values calculated by u...

例如对国产2.25 Cr-1 Mo钢在565℃下蠕变裂纹扩展问题进行计算得到的C~*对裂纹扩展速率dα/dt的关联结果，与其他同事用实验得到的结果基本一致。

Scanning electron microscope analysis showed that there are more elements enrichments in the crack position, which are O, Ca, Mg, Na and Cu etc. The carbon content of molten, casting process, heating time and so on are main reasons which result in the cracks.

扫描电镜分析表明，高强钢裂纹处存在较多的O、Ca、Mg、Na、Cu等元素，钢水碳含量、连铸工序、加热时间等是高强钢产生裂纹的主要原因。

By creating the gap the hoof at the area of the quarter crack no longer takes a pounding which keeps the crack open in essence the area Floats giving the crack a chance to mend.

通过创建差距，胡夫在该地区的季度裂纹不再是以冲击，其中存有裂纹公开联络，在本质上面积联络 floats 给予打击一个机会改过自新。

However, such defect as crack, pore, oxidation and ill bonding between cladding layers might appear in RLF parts if the process parameters controlled improperly. And crack was a kind of defect, which was the most familiar and companied with the largest brisance.

但是，如果成形条件控制不当，易于在成形件中产生裂纹、气孔、夹杂、层间结合不良等缺陷，而裂纹是成形过程中最常见、破坏性最大的一种缺陷。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。