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unstable propagation
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  失稳扩展
     THE FRACTURE-RESISTANT CHARACTERISTICS OF LY12CZ ALUMINUM SHEETS WITH REGARD TO THE INITIATION, STABLE AND UNSTABLE PROPAGATION OF CRACKS
     LY12CZ薄板铝材裂纹起裂、稳态扩展和失稳扩展时的抗裂特性
短句来源
     Coarsening grain and intercrystalline network ferrite depress crack growth resistance of the materials strongly and result in unstable propagation of crack very easily.
     晶粒粗大及晶间网状铁素体强烈降低材料的裂纹扩展阻力,并极易导致裂纹的失稳扩展.
短句来源
     From studying on the rotating shaft crack variations from relative stable status to unstable propagation, a real time method to monitor fatigue propagation of the transverse crack in a rotating shaft is presented, in which relative stable status is monitored by real time vibration measurement and unstable propagation of the crack is monitored by unrealtime dc-potential method.
     针对转轴裂纹疲劳扩展所具有的从相对稳定到失稳扩展这两种状态,提出用实时的振动检测方法来监测相对稳定状态,用非实时的电位法对失稳扩展的裂纹进行检测、预报的转轴裂纹疲劳扩展监测方案。
短句来源
     2)Let an angle between the direction of 1 and the normal direction of the crack plane be the twist angle of crack plane, when 1 reaches a critical value, the crack appears in unstable propagation, and the initial direction, twist angle of crack plane and the corresponding fracture equation can be deduced.
     2 )垂直于裂纹扩展径向平面上的主应变因子的方向与原裂纹面法线方向的夹角为扩展裂纹面的扭转角 ,当主应变因子达到临界值时裂纹将失稳扩展 .
短句来源
  “unstable propagation”译为未确定词的双语例句
     THE TRANSIENT RESPONSE CHARACTERISTICS AND COMPUTATIONAL MODEL OF UNSTABLE PROPAGATION OF CRACKS
     裂纹快速扩展的瞬态振动特性和响应计算模型
短句来源
     The Fracture-Resistant Characteristics of Medium-Strength Plates with Regard to the Initiation,Stable and Unstable Propagation of Surface Cracks
     中强板材表面裂纹起裂、稳定扩展和失稳扩展时的抗裂特性
短句来源
     By observation of the fracture surfaces and special metallography sections of C-Mn steel multipass MMA weld metals and simulated weld specimens which were fractured at -60℃ by Charpy V tests, the initiation of crack,metallographical characteristics of the metal near the crack, and the critical event of unstable propagation of crack were investigated into.
     本文通过对多层焊缝及其热模拟试件-60℃下的冲击断口及特殊金相截面观察,研究了启裂源、启裂区的金相特征和失稳开裂的临界事件。
短句来源
     In peak-aged condition,a decreasing in matrix deformation ability resulted from dead pinning of dislocations by fine carbide particles precipitated from ferrite and,a increasing in matrix elastic strain energy conducted by coherence or partial coherence correlate with embrittlement controlled by crack unstable propagation in impact fracture process.
     峰时效阶段沉淀出细小碳化物质点对位错的强钉扎作用使基体塑性变形能力下降,质点与基体的共格、半共格关系使基体弹性畸变能较高,冲击断裂过程为裂纹萌生控制的脆性失稳断裂。
短句来源
     In this paper, the incremental path-independent integral  is studied for unstable propagation of creep crack problem. Based on the experiment of the creep crack growth under high stress state, the relationship between the integral rate  and crack growth rate under the unsteady growth process is worked out. At the same time, some parameters of the crack-tip fields, such as the stress, the plastic strain, the creep strain and the triaxiality stress etc.
     主要研究了增量路径无关积分参数在蠕变裂纹非稳定扩展阶段的推广应用,在确定积分参数与裂纹扩展速率有线性关系的同时,对三轴应力度、塑性应变和蠕变应变等裂尖参数在裂纹扩展过程中的变化作了比较和说明。
短句来源
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  相似匹配句对
     DELAYED UNSTABLE CRACK PROPAGATION OF CONCRETE CRACKED BODY
     混凝土裂纹体的裂纹延迟失稳扩展(英文)
短句来源
     THE TRANSIENT RESPONSE CHARACTERISTICS AND COMPUTATIONAL MODEL OF UNSTABLE PROPAGATION OF CRACKS
     裂纹快速扩展的瞬态振动特性和响应计算模型
短句来源
     Wave propagation
     波的传播
短句来源
     e, as unstable fracture;
     e不稳定骨折 ;
短句来源
     e,unstable fracture;
     e,不稳定骨折;
短句来源
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  unstable propagation
For samples with two artificial pre-existing flaws the third phase is split into two parts and failure of the sample occurs only after both the unstable propagation of external wing cracks and coalescence of the internal cracks in the bridge.
      
Studies of the unstable propagation and arrest of brittle fractures were conducted on four steels: plain carbon steel, 3 pct Si steel, A-517, and 4340.
      
The specific surface energy and kinetics of the crack undergoing unstable fracture depend both on the maximum crack growth rate in the material and on the initial rate υ0 of its unstable propagation.
      
Unstable propagation starts with a rate which is lower than the maximum crack growth rate in the material.
      
By using the energy balance equation for propagating cracks, we estimate the specific surface energy and crack growth rate under the conditions of unstable propagation.
      
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This paper describes the experimental investigation of the fast (unstable) propagation of crack in DCB (double-cantilever beams)specimens under impulsive loading of the order of 10~(-3) sec. (mechanical shook, 10~(-2)-10~(-4) sec). A new eddy-current method is developed. Differing from several methods usually used and also from that using eddy-current probeservosystem to "lock on" the crack tip, this method avoids the disadvantages of other methods, and has recorded the whole extension-time history...

This paper describes the experimental investigation of the fast (unstable) propagation of crack in DCB (double-cantilever beams)specimens under impulsive loading of the order of 10~(-3) sec. (mechanical shook, 10~(-2)-10~(-4) sec). A new eddy-current method is developed. Differing from several methods usually used and also from that using eddy-current probeservosystem to "lock on" the crack tip, this method avoids the disadvantages of other methods, and has recorded the whole extension-time history of the fast propagation, especially the initial portion just after the onset of extension of which little is known today. From the oscillograph of the acceleration and the displacement responses, onset of extension can be accurately determined, as well as the small displacements of the loading points on the specimen. From this the K_(1C)~(lmp) is easily calculated. from the experimental results, it can be concluded that, for materials which have the K_(IC)~(imp) values increasing with the loading speed, the extension or propagation of sharp crack under impulsive load is fully equivalent to a blunt crack under static load with the grip fixed, i. e., calculations can be made using the concept of equivalent K_Q values.

本文叙述了冲击载荷(机械冲击10~(-2)~10~(-4)秒)下DCB试件快速扩展的实验研究工作,探索出一种新的涡流传感法。此法避免了其他各种方法的缺点,记录下整个扩展过程中裂纹扩展量——时间历程曲线,特别是开裂的起始阶段,这正是目前仍了解得最少的信息。此外,从加速度响应和位移响应波形能正确地确定开裂点和开裂时试件加载点的位移,依此容易地决定K_(IC)~(imp)值。实验表明,对于K_(IC)~(imp)随加载速率增加而增大的材料,冲击作用下尖裂纹的扩展可按等效的位移固定、静载下的钝裂纹情况——等效K_Q值计算。

The paper is written with the aim of trying to investigate the mechanism of rock fracture by way of acoustic emission.Experiments of acoustic emission have been carried out by statically penetrating the bit into rock samples which,we adopted,are the marbles.Four types of indenters are applied : the flat-ended cylinderical punch,the spherical cap,the bullet-shaped cap and the wedge bit.Besides,the experiments of acoustic emission for rock fracture by the rolling disc-cutter are particularly interested to perform.The...

The paper is written with the aim of trying to investigate the mechanism of rock fracture by way of acoustic emission.Experiments of acoustic emission have been carried out by statically penetrating the bit into rock samples which,we adopted,are the marbles.Four types of indenters are applied : the flat-ended cylinderical punch,the spherical cap,the bullet-shaped cap and the wedge bit.Besides,the experiments of acoustic emission for rock fracture by the rolling disc-cutter are particularly interested to perform.The total number of acoustic emission events,the acoustic emission rate(AER) and their distributions have been measured by a monitoring system (Fig.1) with the frequency band of 100-150 KHZ.As a whole,the rock fracture procedure may be marked off as three stages.(a)With the loading increasing,there tend to be a lower level activity of acoustic emission characterizing the interior microcracking of rock sample and so the AER are less of accounting.Only the "initial surface removal takes place in closs vicinity to the pressure area by testing indenter can a smaller peak value of AER arises fortuitously.(b)In case the peak value of penetrating force occures,the load acting on rock sample decreases as the horizontal cracks are initiating nearly to the inner surface of rock sample.At the same time the AER rapidly changes with abruptly rising and falling.(c)Finally,the surface removals are obviously observed and the AER vanishes into nothing even to reload on the increase again.It is caused by the rapid propagation of horizontal cracks.These phenomena have been observed for all the marble specimens tested by various indenters as above.It is probable that the rapid variations described may be attributed to the unstable propagation of horizontal cracks.

本文研究了压头侵入作用下大理岩的声发射。测试结果表明,在压入破岩过程的加载阶段,反映岩石内部微破裂的声发射活动性一般少而低,只有当压头周围产生微小片裂时,才偶发性地出现声发射的小波峰。侵入力一旦达到峰值,岩石内表面附近形成水平裂纹,岩石承受的载荷下降,声发射率(AER)随之发生急剧变化。水平裂纹的快速扩展,最终导致表面片裂。随后,声发射平息。侵入载荷重新增大,声发射活动性依然平静,于是开始下一循环的压入破岩过程。这种现象在各种压头侵入大理岩试验中均被观测到。

In this paper, a method for finding the stress intensity factors K_Ⅰ and K_Ⅱ for sheet with finite width including slanting crack under uniaxial tensile loading is presented. It is. based on linear elastic fracture mechanics and by using functions of complex variables. And by the criterion of maximum shear strain (namely, (ε_θ) max is correlated with K_R and (d~2ε_θ)/(dθ~2)<0), an angle of crack propagation and an equivalent stress intensity factor K_(Ieq) are obtained. Thereby, the critical stress σ_C and crack...

In this paper, a method for finding the stress intensity factors K_Ⅰ and K_Ⅱ for sheet with finite width including slanting crack under uniaxial tensile loading is presented. It is. based on linear elastic fracture mechanics and by using functions of complex variables. And by the criterion of maximum shear strain (namely, (ε_θ) max is correlated with K_R and (d~2ε_θ)/(dθ~2)<0), an angle of crack propagation and an equivalent stress intensity factor K_(Ieq) are obtained. Thereby, the critical stress σ_C and crack tolerance a_C can be obtained when unstable propagation of crack occurs by using energy criterion.

本文依据线弹性力学原理,用复变函数法求得在拉伸载荷下有限宽平板斜裂纹问题的K_Ⅰ和K_Ⅱ,并采用最大剪应变判据((d~2ε_θ)/(dθ~2)<0及(ε_θ)max与K_R相应),求得裂纹扩展角及当量Ⅰ型应力强度因子K_((?)q),再用能量准则求得失稳时的临界应力及裂纹容限.用此方法对几种初始角的几何斜裂纹有限宽平板的剩余强度作了计算,计算结果与有关文献中的数据和试验值相比,开裂角、临界应力及裂纹容限的误差均满足工程要求(2~7%).为进行二维薄壁结构的损伤容限设计,本文提供了剩余强度分析的工程方法及计算程序.

 
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