微裂纹

The results showed that chemisorption of Hg atoms could facilitate dislocation emission and motion.

结果表明：加载裂纹吸附Hg原子后能促进位错的发射、增殖和运动；当吸附促进位错发射和运动达到临界状态时，脆性微裂纹就在原裂纹顶端或在无位错区中形核并解理扩展。

The results showed that chemisorption of liquid metal atoms could facilitate dislocation emission ,multiplication and motioll.

结果表明：液体金属吸附后能促进位错的发射、增殖和运动；当吸附促进位错发射和运动达到临界状态时，脆性微裂纹就在原裂纹顶端或在无位错区中形核并解理扩展。

The test results show that the relation of fracture strength and cumulative fracture probability and loading rate for specimens in distilled water can be show by the two-index Weibull function.

玻璃构件在制造、加工和使用过程中会产生许多大小、性状和方向均不相同的微裂纹，这些微裂纹是造成材料强度值具有很大分散性的主要原因。

The reflection of plane Rayleigh waves from a single microcrack was modeled by FDM and provided an accurate estimation of crack depth.

有限差分法以某个单一的微裂纹为模型，产生平面瑞利波的反射，同时提供一个准确的裂纹深度的估计值。

Therefore, grinding cracks, subsurface scathe and machining parameter's effect to are worthwhile to be studied.

因此，研究磨削裂纹、尤其是亚表面微裂纹的形成与扩展，及其与加工参数的关系；具有重大的现实意义。

The experimental investigation and analysis are presented for exploring the intrinsic link betweencompressive deformational response and crack behavior of the mortar specimens.

1引言 微裂纹的萌生、演化和成核而引起受损固体的非线性力学响应对材料和工程的变形和破坏非常重要，对于以水泥为基材的脆性固体材料，裂纹常常是材料的非弹性变形和破坏的决定性因素，因而它已经成为一项重要的研究课题[1]。

Consequently,the model obviates the needs for fitting and reducesthe arbitrariness to minimum,if the law of crack growth in mesoscopic level,i.e.,theR curve,is known.Naturally,the model relates the macrostructural response of thesolid with its mesotructure(the density,size and orientation of the crack).

如果细观微裂纹扩展阻力，即R曲线已知，无需再在演化规律中引入大量的经验参数，即可自然地建立起材料的细观结构(微裂纹尺寸，密度和方位)演化与材料的宏观响应的联系。

Ring has to be reground.

轧槽轧制到一定时间时会出现微裂纹，当微裂纹延长加深至0.2mm时应下机修磨。

And the strengthening mechanism can be described as follows: WC cemented carbides have interlaced short-clubbed grain, and in the bend strength test, the microcrack generates at WC/WC grain boundary, and may be blocked by interlaced fine-clubbed grains during extending, which induce the intergranular pulling-out. Due to the pulling-out mechanism, fracture-extend energy is greatly expended, thus bend strength is increased. The wear mechanism is groove wear and spalling of WC grains.

热机械合金化合成的WC-Co硬质合金比传统方法制备的同类WC合金具有更高的强度，其机理是：热机械合金化合成的WC合金具有交替排列的短棒状组织，在三点弯曲试验中，微裂纹萌生于WC/WC晶界位置，受到交错排列的短棒状晶粒的阻碍，裂纹扩展以短棒状晶粒的拔出方式进行，极大地消耗了裂纹扩展的能量，从而提高了弯曲强度；合成试样的摩擦磨损过程以犁沟磨损和WC颗粒的剥落为主要特征。

The micro-crack for sucker rod is inspected by magnetic flux leakage inspection by now, but it is not good for accuracy and sensitivity.

针对目前漏磁检测抽油杆微裂纹的精度和灵敏度不高的现状，提出一种通过拉伸抽油杆使微裂纹张开后的漏磁检测法。

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。