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In these studies, the tangential stress on the free surface was taken equal to zero, and the fluid film was always considered essentially plane.


In this case, the interface has a finite radius of curvature and the tangential stress on the interface may be significantly different from zero.


Stability of wave forms of motion of a viscous fluid layer under tangential stress


We study the stability of wave flow of a viscous incompressible fluid layer subjected to tangential stress and an inclined gravity force with respect to longwave disturbances.


Wave formation on surface of viscous liquid due to tangential stress

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 The designing principle of the piezoelectric ceramic microphone of the acoustic oil well logging tool are outlined in the paper.The derived stress distribution formula in terms of the two layer cylindical transducer revealed that the circumferential stress of the cylindical transducer is far greater than its radial stress. Basing on this rcsult,the requirements of the packing materials are specified. According to the electroacoustlc sensitivities of piezoelectric ceramic cylinders, the requirements of the... The designing principle of the piezoelectric ceramic microphone of the acoustic oil well logging tool are outlined in the paper.The derived stress distribution formula in terms of the two layer cylindical transducer revealed that the circumferential stress of the cylindical transducer is far greater than its radial stress. Basing on this rcsult,the requirements of the packing materials are specified. According to the electroacoustlc sensitivities of piezoelectric ceramic cylinders, the requirements of the piezoelectric material and the configuration are also outlined. The experimental data of electracoustic sensitivity of the piezoelectric ceramic microphon and the measured curve of the prototype device are listed.  本文介绍用于石油井深探测仪的压电陶瓷传声器的设计原理.根据导得的二层圆筒换能器内的应力分布公式,证明了其切向应力远大于径向应力, 由此提出了对包封材料的要求.根据所得的电声灵敏度公式提出了对压电陶瓷材料的要求和理想的结构形式.文中列出了在不同结构因素下的这种压电陶瓷传声器的电声灵敏度的实验数据.还给出了这种压电陶瓷传声器用于模拟井深测时的实测曲线.  In this paper,the effect of decoupling charge in smooth blasting on maximun tangential stress,relative strain amplitude,the peak value of kine tic strain and the expansion of crack formed by blasting has been expounded. The author suggests that the remaining volume is calculated by Alel's state equation of remaining volume and explosion equation of power,and optimal decoupling coefficient is derived by heatinsulated equation.The results show that the theoretic value is very near to the practice value,and that... In this paper,the effect of decoupling charge in smooth blasting on maximun tangential stress,relative strain amplitude,the peak value of kine tic strain and the expansion of crack formed by blasting has been expounded. The author suggests that the remaining volume is calculated by Alel's state equation of remaining volume and explosion equation of power,and optimal decoupling coefficient is derived by heatinsulated equation.The results show that the theoretic value is very near to the practice value,and that the coe fficient of decoupling charge is desirable  文中叙述了不偶合装药在光面爆破中的作用,如对最大切向应力、相对应变幅值、动应变峰值和爆破裂隙扩展等的影响。作者建议用阿贝尔余容状态方程和炸药爆炸反应方程式来计算余容,並根据绝热方程式推导出最佳不偶合系数。用该式的计算值与现场实际取值十分接近,说明用该式计算不偶合系数是可取的。  In (his paper, a method of Fuzzy theory for the classification of the crack zones by blasting is developed. The authors adopt the maximum radial stress. maximum shear stress and maximum tangential stress as the main crack criterions. By the method of two element distribution, the authors analysed the distribution of the weights among the crack criterions, by using the normal distribution function, descending normal distribution function and the ascending normal distribution function as the subordinate function... In (his paper, a method of Fuzzy theory for the classification of the crack zones by blasting is developed. The authors adopt the maximum radial stress. maximum shear stress and maximum tangential stress as the main crack criterions. By the method of two element distribution, the authors analysed the distribution of the weights among the crack criterions, by using the normal distribution function, descending normal distribution function and the ascending normal distribution function as the subordinate function of the crack critri ion respectively, they divide the crack zones in three classes: the super crack zone ,the initial crack zone and the pure tensile zone.Then a synthesized evaluating method is proposed. As exapmples. it is demonstrated that this method may be used for large or small amount of explosives.  本文以最大径向应力,最大剪应力和最大切向应力为主要的破碎准则,利用二元分配法分析了诸破碎准则间权的分配,采用正态函数、降正态函数和升正态函数为各个破碎准则的录属函数,由此提出了爆炸破碎的过粉碎区,初始裂缝区和纯粹拉断区划分的综合评价方法。实例证明,对于大药量或小药量爆炸,以上方法均可成立。   << 更多相关文摘 
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