电活性聚合物球壳的力电不稳定性

应用连续介质力学有限变形理论,分析了不可压电活性聚合物球壳在外加电场及内压作用下发生非对称变形的力电不稳定性问题.文中给出了不同外加电场下球壳的变形曲线和应力分布曲线,结果表明对壁厚小于临界壁厚值的薄壁球壳,当内压大于临界内压值时,球壳可以产生不稳定的非对称变形.文中求得了球壳发生不稳定变形的临界壁厚及临界内压,探讨了外加电场对两个临界值的影响规律,同时讨论了外加电场对球壳中应力分布的影响.     

锥面间流体流动考虑流动惯性的近似解

本文采用锥坐标下的Navier-Stokes方程式,利用迭代近似解法,求出了考虑流动惯性时锥面间流体流动的速度分布、压力分布以及流量的解析式;并对轴对称过流流动的外向流和内向流进行了比较.     

AN APPROXIMATE SOLUTION CONSIDERING FLOW INERTIA BETWEEN CONICAL SURFACES

In this paper, analytical calculation expressions of the pressure distribution, velocity distribution and the rate of the flow between conical surfaces are found by using the method of iterative approximate solution when the inertia terms of the Navier-Stokes equations in conical coordinates are taken into account. Furthermore, we compare the centrifugal flow with the centripetal flow of axisymmetrical passing flow.     

An approximate solution considering flow inertia between conical surfaces

In this paper, analytical calculation expressions of the pressure distribution, velocity distribution and the rate of the flow between conical surfaces are found by using the method of iterative approximate solution when the inertia terms of the Navier-Stokes equations in conical coordinates are taken into account. Furthermore, we compare the centrifugal flow with the centripetal flow of axisymmetrical passing flow.