复合载荷下圆薄膜大挠度问题的一般解
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摘要
薄膜结构已广泛应用于航空、航天、造船、化工、仪表等工业部门。本文的主要目的是求解轴对称圆薄膜在均布力和中心集中力联合作用(复合载荷)下的一般解。文中首先建立了轴对称圆薄膜在复合载荷作用下的大挠度基本方程,然后将基本方程无量纲化,推导了基本方程边界条件的无量纲表达式。推广了Hencky变换,采用幂级数法,得到了基本方程用无量纲集中力系数表示的一般解Ⅰ和用无量纲均布力系数表示的一般解Ⅱ。重点计算了两种载荷反向作用这一最具有实际意义的复合载荷情形,确定了一般解的待定常数及其收敛区域。最后运用得到的一般解,以圆薄膜的无量纲径向坐标x为变量,采用编程计算,得到以表格表示的弹性特征系数关于载荷比α和β以及材料泊松比ν之间的关系。
Circular Membrane structures play a very important role in engineering field which includes aviation, spaceflight, shipbuilding, civil engineering, meter, and so on. The fundamental objective in this dissertation lies in obtaining general solutions to large deflection of axis symmetrical circular membrane under the action of uniformly distributed load and concentrated force which are defined composed load. In this paper, firstly, the author constructs the basic equations of large deflection of axis symmetrical circular membrane under composed load, then, gains the dimensionless basic equations and its boundary conditions. Secondly, applying for the extended Hencky transformation and power progression method, two general solutions which were respectively described by uniformly distributed force and concentrated force were reasoned. The author focuses on the composed load that the uniformly distributed force and concentrated force are contrary, which is very significant in reality, and calculates the variable parameter and it’s constringency area. Finally, the author gains the elastic characters equations of axis symmetrical circular membrane under composed load, writes the calculation programs, and gains the relations of the elastic characters and the load ratio and the Poisson’s ratio. The relations are tabled so that we can inquire. Then, the author discussed the change trend of the general solutions with the variational physical parameters by drawings.
引文
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