查询词典 brittle star

Author develop ELID grinding technology system, on MM7120A surface grinder and fulfilled a lots of ELID ultraprecision mirror grinding for kinds of hard and brittle materials. To use this method, the surface roughness of mechined materials can reach nanometer gade (Ra0.006～0.010 μm), and can replace parts of grind and polish technology.

本文作者开发了在MM7120A平面磨床上的ELID磨削工艺系统，实现了对多种硬脆材料的ELID精密镜面磨削试验，工件表面粗糙度可达nm级（Ra0.006-0.010μm），可取代部分硬脆材料的研磨、抛光工艺。

Low a-amylase activity, especially in conjunction with low starch gelatinization, leads to a firm and brittle crumb structure .

面粉中a-淀粉酶活性，尤其再结合以较差的淀粉糊化性，就会导致最终制品呈现一种坚硬，脆裂的屑状结构。

The cause of brittle fracture on power hacksaw blades-blank were analyzed.

检验分析了机用锯条坯脆断的原因。

This kind of steel becomes very hard and brittle when it is hardened.

这种钢淬火后就变得很硬很脆。

In the same way failure area is not single andis more complex with decrease of scale of specimens. And failure shape ismore close to quasi-brittle failure. It varies with homogeneousness that thescale of specimens at which failure shape changes.(3) The failure shape of homogeneous specimens with crack is controlledby crack. But that of heterogeneous specimens with crack is controlled bycrack and heterogeneousness.(4) Acoustic emission doesnt appear until homogeneous specimens fail.

但对于不同均质度，试件破坏形态发生变化的尺度也不同；(3)对于均质度较高的含裂纹试件，试件的破坏形态主要受裂纹控制，而对于均质度较差的含裂纹试件，试件的破坏形态由试件材料的非均匀性和裂纹共同控制；(4)均质度较高的试件，破坏前，试件内不出现声发射，破坏瞬间，声发射在某些部位同时出现，且随尺度增大，试件声发射能量增大，声发射区趋于集中。

Theobserved strain is 10~2 times as local point strain at the same observed stress.This indicates that macroscopical symmetrical rock is quasi-brittle materialwith microcosmic heterogeneousness and its macroscopical mechanicalbehavior is the results of reciprocity and magnification between microcosmiccharacteristic, not simple sum.(4) The degree of irregularity of strain increases with the number of cycle.But degree of irregularity of transverse strain fluctuates larger at the samecycle. Moreover degree of irregularity of transverse strain is larger than that ofaxial strain. This shows that deformation and failure of rock is process ofevolvement of small crack. Small crack evolves from even and out-of-orderstatus to heterogeneous and ordinal status.(5) Ultrasonic speed decreases with the number of cycle. The decreasecourse is such: Firstly, ultrasonic speed fluctuates in a steady scope in somecycles; And then ultrasonic speed quickly decreases to a certain more smallvalue; Afterwards in succedent cycles, ultrasonic speed fluctuates about thevalue. That is to say, ultrasonic speed fluctuates and decreases at intervals ofcycles. In deformation process of rock, quantitative change and qualitativechange of its small crack evolvement carry through crosswise.(6) Strength and modulus of rock decrease with exponential function asscale of specimens increases.

同一表观应力下，局部点应变与表观应变相差可达2个数量级，表明宏观上均匀的岩石是具有细观特征的准脆性材料，其宏观力学行为是细观特征相互作用、放大的综合结果，而不是简单的叠加；(4)岩样轴向应变不均匀程度和横向应变不均匀程度随循环次数的增加渐进增大，但是在同一个循环内，横向应变离散系数随应力的变化波动较大，且同一循环级别下，横向应变不均匀程度大于轴向应变不均匀程度，表明岩石内部微裂纹的演化是岩石变形破坏的本质特征，这一演化表现为微裂纹从均匀无序分布逐渐向非均匀有序发展；(5)随循环次数的增加，所有岩样内部超声波速会出现衰减，衰减过程表现为在某几次循环内超声波速在某一相对范围内波动，然后急剧减小到某一较小值，在随后的循环内，超声波速又会保持在这一较小值附近波动，即超声波速表现为波动和急剧减小间隔形式衰减，表明从宏观看来平稳的岩石变形过程，内部结构演化过程(微裂纹发展及其相互作用)却表现为均匀量变和突发质变不断交叉进行的现象；(6)岩石强度和弹性模量随尺度增大呈指数函数规律减小。

This article analyzes the reason for brittle of humidifier I.

分析了增湿器Ⅰ产生脆化现象的原因。

For the humped back is often the most visible sign of osteoporosis,a progressive disease that leaves bones thin and brittle.

因为驼背通常是骨质疏松症最明显的症状，此症使得骨头逐渐变薄易碎。

Glass fibers increase the impact toughness of brittle matrix, but reduce the impact toughness of ductile matrix.

复合材料的断裂破坏机理也因界面粘合的差异而不同，而表现出不同的断裂形貌。

Brittle refers to hardness and inelasticity of material that make something especially likely to fracture or snap when it is subjected to pressure.

指在受到压力时尤其可能被打碎或折断的物体原料的硬度或是无弹性

We are in a good position to meet your requirements.

我们完全可以满足你方的需求。

We are all pervade d with a sense of disaster.

我们普遍有大祸降临的感觉。