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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 force characteristics of the bit body were investigated, and its static and dynamic stresses were measured. The measured results shows that the damage of the bit body was mainly caused by tangential stress. The basis was provided for correct selecting the steel types of the bit body and working out reasonable technology according to this conclusion.  本文研究了小钎头体受力的情况及其静态和动态的应力测定。测定结果表明,钎头体主要是由切向应力引起账裤破坏。这个结论为钎头体正确选用钢材和制订合理的加工工艺提供了依据。  The effect of gas pressure from explosion on the dynamic stress field formedaround a borehole was investigated with the dynamic photoelastic method.Thecharges were loaded respectively into an centre borehole of two models.In one ofthe models,the charge was put into an open borehole,and in the other model,the charge was put into a sealed container.A multiplespark dynamic photoelasticapparatus was used to record the propogation of dilatational and shear waves andextension of cracks and fissures.Some important... The effect of gas pressure from explosion on the dynamic stress field formedaround a borehole was investigated with the dynamic photoelastic method.Thecharges were loaded respectively into an centre borehole of two models.In one ofthe models,the charge was put into an open borehole,and in the other model,the charge was put into a sealed container.A multiplespark dynamic photoelasticapparatus was used to record the propogation of dilatational and shear waves andextension of cracks and fissures.Some important conclusions relevant to theboosting effect of explosion pressure are as follows:1.The amplitude of dilatational wave produced by sealed charge almost doublesthat produced by unsealed charge and the width of the pulse is also increased.2.The maximum radial displacement produced by sealed charge is 2—3.5foldover the unsealed charge.The absolute values of maximum radial and tangentialstrain of the sealed charge is about 2.5fold over the unsealed charge.And theabsolute values of maximum radial and tangential stresses are approximately2fold over that of the unsealed charge.3.The ratio of σ_r_(max) toσ_θ_(max) in the compression phase of incidence P waveis the same,no matter weather the charge is sealed or not.4.The average length of radial cracks and fissures around the borehole withthe sealed charge is about 8/3fold over that with unsealed charge.  本文用动光弹方法研究了炸药爆炸产生的气体压力对炮孔周围应力场的影响。炸药分别装在两个模型的中心炮孔中。一个模型中为敞露装药,另一个模型将装药容纳在一个特殊的密封装置中。多火花式动态光弹性仪被用来记录膨胀波和剪切波的传播以及裂纹的扩展。文章给出了爆生气体增压作用的一些重要结论:1.密封装药时膨胀波脉冲幅度比敞露装药时的幅度高一倍左右,脉冲宽度也有所增大。2.密封装药时最大径向位移是敞露装药时的2—3.5倍,最大径向和切向应变的绝对值是敞露装药时的2.5倍左右,最大径向和切向应力的绝对值是敞露装药时的2倍左右。3.无论是密封装药或是敞露装药,在入射 P 波的压缩相中,σ_r_(max)对σ_θ_(max)的比值约为3。4.密封装药时炮孔周围的径向裂纹的平均长度为敞露装药时的8/3倍。  Based on experimental data and theoretial anslysis,“the shape o the stress distribution curve in rock body around a roadway”, which as has has been commonly puoted in textbooks,papers and books on rock mechanics“and”underground pressure“pudlished in China, sas been questioned in this paper.Thviewpoint that the tangential thress between the“two zones”(the plastic zone and the elastic zone) in the rock body around a roadway is not in continuity( i.e.there is a“jump”)has been put forward by the author.And it has... Based on experimental data and theoretial anslysis,“the shape o the stress distribution curve in rock body around a roadway”, which as has has been commonly puoted in textbooks,papers and books on rock mechanics“and”underground pressure“pudlished in China, sas been questioned in this paper.Thviewpoint that the tangential thress between the“two zones”(the plastic zone and the elastic zone) in the rock body around a roadway is not in continuity( i.e.there is a“jump”)has been put forward by the author.And it has beee furth er pointed out that the currently used calculation method for the rangy of the fractured zone is not standing on a theoretical base.prelimilare analysis on the difference between tangential stresses in the juncture o the two zones in different conditions of strata has been also made in this paper.  本文从实验资料和理论分析两个方面,对目前国内已出版的有关“岩体力学”和“矿山压力”论著中普遍引用的巷道周围岩体内应力分布曲线形态”进行质疑。提出了在巷道周围岩体内“两带”(弹性带和塑性带)交界处切向应力不连续(即存在一个“跳跃”)的观点。进一步指出了目前通用的“破裂带范围计算方法”缺乏理论依据。文中还对不同岩石条件下,“两带”交界处切向应力差值的大小作了初步分析。   << 更多相关文摘 
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