【摘要】 应用增量形式的拉格朗日列式法,对具有纵、横向加筋迭层圆柱壳,受外载及湿、热载荷联合作用下的稳定性进行了非线性有限元分析,并应用Sander壳体理论及横向剪切的影响,推导了矩形壳元及与该壳元变形相协调的直梁元和曲梁元的切线刚度矩阵,温度、湿度的等效载荷列阵,编制了FORTRAN计算程序,给出了一些计算实例。更多还原

【Abstract】 Based on the total Lagrangian incremental formulation of a two-dimensional anisotropie medium a nonlinear finite element is developed, and its appeication in the geometrical nonlinear buckling and postbuckling analysis of stiffened layered composite shell is demonstrated via example problems under the combination of mechanical loading and hygrothermal loading, The finite element based on the Sander’s shell theory with transverse shear strains is also presented, the tangential stiffness matrices of rectangle shell finite element, the beam and the curved beam, the eguivalent hygrothermal force vector, the method of analysis of buckling and postbuckling is given. Finally, several example problems are given by the FORTRAN Programme.更多还原