裂纹

But the miniplate became even softer,still opaque and easy to break with some gabs on the surface six months later.The miniplate became into something like cheese,softer and exquisite twelve months later.

扫描电镜观察可见散在的比较表浅的小裂纹和凹槽；植入后6个月时，大体观察见接骨板表面已经变成白垩色，质硬，不透明，易折断，其上有裂纹。

The fatigue propagation of surface cracks on overlay of hydrogenation reactor is seriously imperiling the safe run of hydrogenation reactor. It is attracted attention of engineering fields that a surface crack on overlay is able to either stop at the interface of overlay and base material or growth to base material under fatigue load.

热壁加氢反应器堆焊层表面裂纹的扩展严重威胁设备的安全运行，在疲劳载荷作用下堆焊层表面裂纹是否能穿过堆焊层与基体的交界面而向基体扩展的问题，受到工程界的高度关注。

The processes of propagation, kinking of micro cracks in concrete and the interaction among cracks as well as the induced failure are analyzed by using the model describing the wing type crack from the view point of micromechanics.

本文从混凝土细观机理出发，采用翼型裂纹模型分析了围压荷载下混凝土内微裂纹扩展、弯折和相互作用直至材料破坏的过程。

We approach the problem based on the perception that electric field induced microstructure evolution at the crack tip will lead to fracture and fatigue. It follows that a micrograph of intensified electric field induced domain switching at the crack tip is obtained, a theoretical model of domain switching induced fracture is proposed, and the failure mechanisms of electric fracture, electric fatigue and crack kinking are revealed.

论文从电场驱动的裂尖微结构演化导致电致失效这一基本思路出发，获得了裂尖集中电场诱发铁电畴变的实验图像，提出了电致畴变断裂的理论模型，阐明了铁电陶瓷电致断裂，疲劳裂纹扩展和裂纹偏折的失效机理。

Axial crack nucleates at MnS, CaS and precipitated phase, and propagates under internal hydrogen pressure.

而纵向裂纹则主要在析出相处萌生，裂纹扩展受拉应力和氢压双重控制，拉应力为主导。

The results show that the steel in different solution has better performance of anti-hydrogen induced cracking,there is no cracking inside the steel; micro-cracking on the specimen surface mainly nucleates at pitting corrosion pits and expands along the polygonal ferrite; the expansion mode is mostly transgranular type, and the expansion terminates in acicular ferrite.

研究结果表明：该管线钢在两种溶液中均具有较好的抗氢致开裂性能，试样内部没有发现裂纹；试样表面的微裂纹主要在点蚀坑处形核并沿多边形铁素体扩展，扩展模式多为穿晶型，并终止于针状铁素体。

The metal melt around the oblique crack tip passivates the crack tip and inhibits the cracking trend of main crack source.

在瞬间超强脉冲电流作用下，裂尖前缘发生了强烈的绕流热集中现象，斜裂纹裂尖附近金属熔化，钝化了裂尖，阻止了干线裂纹源的开裂趋势。

Scabbing on heavy rail steel is usually associated with the formation of crack.

重轨钢中结疤缺陷的形成主要与生产过程中裂纹的形成有关，裂纹形成后，在生产过程中发生氧化而形成氧化原点和脱碳是导致结疤形成的主要原因。

In the coating, the nodular defect was observed to worsen severely the properties. For testing under oxidation condition, the nodular defect results in the internal oxidation of Al. No single Al oxide scale may be formed at 1100℃ owing to consumption of Al. Under hot corrosion, it becomes as short-path for diffusion of S through the coating, thus sulphuring the coating together with the substrate. During thermal shock testing, it may act as the source of cracking, and moreover, if cyclic stress applied, the cracks propagate toward the substrate, the thermal fatigue properties of coating will be worsened.

结果表明：在氧化条件下，缺陷导致Al的内氧化，在1100℃时，由于Al的大量内消耗，涂层表面已不能形成单一的氧化铝膜，使氧化性能下降；在热腐蚀条件下，缺陷成为硫向涂层中扩散的通道，导致涂层及基体的硫化；在冷热疲劳条件下，缺陷成为裂纹源，在交变应力作用下，裂纹向基体中扩展，降低了涂层的热疲劳性能。

Meanwhile, phase transition (t-ZrO2 to m-ZrO2) has also been detected by XRD and this behavior toughens the toughness of the composite.

作者在讨论复合材料的裂纹扩展上不够准确，由于图6照片看不到晶粒和晶界，因而不能准确判断裂纹扩展方式。4。

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。