查询词典 microcrack

E. , plastic deformation developed into a critical state, local stress in dislocation-freezone will be equal to atomic bond strength, which will induce the initiation of SCC microcrack.

为了说明这个附加拉应力在阳极溶解型SCC中的主要作用，对不同含H〓O量的甲醇溶液，用慢拉伸法测量了SCC敏感性，同时测量了自然腐蚀时表层拉应力的大小。

Different secondary layers of fossil brachiopod shells have different preservation and the way by which the shells' primary isotope ratios be influenced by diagenesis: postdepositional alternation of δ〓O、δ〓C has no effect on the low-Mg calcite minerals of the shells, while it alters the whole shell's isotopic compositions by microcrack fillings, even with the well preserved shells.

1成岩后生作用对腕足化石壳体不同结构单元的改造方式及改造程度不同：成岩后生作用对保存较好的腕足化石壳体的改造是以微裂隙充填方式进行，而对低镁方解石本身并没有影响。

Thermal oxidation treatment can increase the surface hardness and elastic modulus significantly and reduce the E /H ratio of the TC4, which indicate the treatment can enhance the wear resistance of TC4 alloy. Long time treatment can increase the thickness of the oxide layer, but the outside layer is apt to desquamate during the scratching. The oxide layer closing to substrate has better bonding properties, but microcrack forms as a result of high stress loading, which lead the layer to flake off completely.

长时间的高温氧化可以增加氧化层的厚度，但在划擦过程中氧化层发生两次脱落，表明氧化层由外表层和次外层组成，外层结合力差，易发生一次脆性剥落，内层与基体的结合强度较高，但在较大载荷作用下会产生微裂纹，导致氧化层的二次剥落。

Many research works have been done on the moving characteristics of ground-fluid controlled by structural stress in China and abroad , but the research on microseepage of microcrack caused by Earth tide is complete blank .

目前国内外对构造应力作用下地球内部流体运动的规律与特征的研究已经很多，但面向地应变固体潮对地壳微裂缝系统的微渗漏作用影响的研究尚属空白。

On one hand, the grain boundaries are the sites of microcrack nucleation, microcracks first occur at grain boundary zone, whose propagation type depends on lamellar orientation of both side of grain boundary.

一方面，微裂纹首先萌发于晶界区，其扩展方式取决于晶界两侧片层的取向。

Keeping metallurgical observation upon microcrack and making energy spectrum analysis of its top, we think that propagation of microcrack is across cr...

结果表明，对于大庆油田的井下油水介质环境来说，腐蚀对疲劳裂纹的形成不起明显作用，只对裂纹的扩展有一定的加速作用。

The data of microcrack parameters in different temperatures were processed based on statistical theory; and the regularities of distribution of microcrack parameters were obtained.

基于统计学理论，从细观层次对不同温度下的岩石断口微裂隙参数数据统计分析，得到了岩石微裂隙几何参数在不同温度下的分布概型，并运用Monte-Carlo随机模拟的方法，再现微裂隙在工程岩体中的分布。

The domain of microcrack growth is defined and used to describe the damage state of microcrack-weakened brittle materials. Based on this concept, the problems of micro-damage evolution and macro-constitutive response can be solved easily.

建议用微裂纹扩展区的概念来描述脆性材料的各向异性损伤状态，从而方便地解决了复杂加载路径下材料的细观损伤演化和宏观本构关系问题。

Based on some principal rules of brittle rocks polyaxial tests and previous researches, three controlling failure types for brittle rock are obtained. The first type represents the brittle failure controlled by extension microcrack under the condition of lower hydrostatic pressure; the second represents the ductile failure controlled by friction sliding action under the condition of higher hydrostatic pressure when microcrack is close; and the third represents brittle-ductile failure type controlled by multiple factors mentioned above under the condition of high hydrostatic pressure when some microcracks are open and others are close.

通过分析脆性岩石多轴试验中的强度和破坏规律，在已有研究成果基础上，将其强度和破坏控制类型主要归结为3种：类型1，低静水压力时裂缝张开扩展，主要表现为张性微裂缝控制型脆性破坏；类型2，静水压力很高时，裂缝闭合，主要表现为摩擦滑移控制型延性破坏；类型3，处于两者之间时，微裂缝一部分张开，一部分闭合，主要表现为两者复合控制型脆延破坏。

Crack sliding induced microcrack surface normal dilation and normal dilation induced microcrack further self-similar propagation are considered, the ineracting of sliding and propagation is clarified. The fourth-order tangent homogeneous stiffness tensor of shear microcrack is deduced, and at last the constitutive model of low porosity is expressed in increment formulation though unit sphere surface integral.

3在评述当前常用的微裂纹滑移准则的基础上，提出了本文的滑移准则，考虑了微裂纹滑移引起的裂纹面法向膨胀，以及由法向膨胀引起的微裂纹进一步扩展，阐明了滑移-扩展相互影响的细观力学机制。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。