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切向应力
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  tangential stress
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 long-wave disturbances.
      
Wave formation on surface of viscous liquid due to tangential stress
      
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The tangential stress at the boundary can not be gained directly in the application of Boundary Element Method to analysing elastic stress.In this paper,difference method is used for solving tangentical stress at the boundary on the basis of Boundary Element Method. The difference formulas for the boundary tangential stress are derived for the constant boundary elements. The calculation shows that the method in this article is feasible,simpie and practical.The method developed in the article also can be used...

The tangential stress at the boundary can not be gained directly in the application of Boundary Element Method to analysing elastic stress.In this paper,difference method is used for solving tangentical stress at the boundary on the basis of Boundary Element Method. The difference formulas for the boundary tangential stress are derived for the constant boundary elements. The calculation shows that the method in this article is feasible,simpie and practical.The method developed in the article also can be used to calculate the boundary tangential stress of higher boundary elements.

在用边界元法作弹性应力分析中,不能直接计算出弹性体边界切向应力。本文在边界元法分析的基础上,用差分法计算边界切向应力。推导出常边界元情况下边界切向应力的差分公式。计算表明文中所述方法是可行的、简单实用。所研究的方法也适用于高次边界单元的边界切向应力的计算。

This paper analyses the stress of ringlike plate which has stationary periphery and receive concentric ringlike load. Thus the computation formulas on radial stress, tangential stress and deflection are derived. Finally it gives the determination method of general stress curve and maximum stress.

本文分析了具有固定周边受同心环载荷环板的应力,从而导出径向应力、切向应力及挠度的计算公式,最后给出了一般应力曲线及最大应力的确定方法。

The boundaries of an axisymmetric structure loaded symmetrically and non-symmetrically are composed of straight or circular segments defined by inputs from point coordinates and radius values.To make the tangential stress on part of the boundary fairly uniformized and minimally concentrated,an optimal shape design for the structure is analysed by using finite element method involving triangular (six nodes) or quadrilateral (eight nodes) elements.A concept of mobile or fixed substructure is used with an automatic...

The boundaries of an axisymmetric structure loaded symmetrically and non-symmetrically are composed of straight or circular segments defined by inputs from point coordinates and radius values.To make the tangential stress on part of the boundary fairly uniformized and minimally concentrated,an optimal shape design for the structure is analysed by using finite element method involving triangular (six nodes) or quadrilateral (eight nodes) elements.A concept of mobile or fixed substructure is used with an automatic mesh generator. Several improvements in calculating stress and stiffness matrix derivatives are made.An example is given for demonstrating the use of the program established.

分析了对称载荷或非对称载荷作用下轴对称结构的形状优化设计,其目的是使结构边界的切向应力分布均匀,从而使应力集中达最小。结构边界采用两种方法描述,一种由直线段或圆弧组成,设计变量从定义这些直线段或圆弧段的点坐标值和半径值中选择;另一种是由样条函数描述待优化的边界。结构分析由有限元素法完成,采用六节点三角形单元或八节点四边形单元。应用可变子结构或固定子结构的概念,并配备相应的自动网格生成器。提出了关于应力计算和刚度矩阵微分的一些改进措施,同时编制程序并完成了一个计算实例。

 
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