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Linear and geometrically nonlinear vibrations of fiber reinforced laminated plates and shallow shells

机译:纤维增强层压板和浅壳的线性和几何非线性振动

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This paper deals with the free flexural vibration of laminated quadrilateral plates and shallow shells using the Rayleigh-Riz method. Equations are derived using the first order shear deformation theory of plates and shells. Nonlinearity is present only in the in-plane strain components. The transverse shear strains, curvature and inertial terms are linear. The geometry is mapped using the natural coordinates. Admissible displacement fields are constructed by taking the product of two simple polynomials in each of the two parametric coordinates. By controlling the coefficients of these polynomials, the geometric boundary conditions are satisfied. Numerical results are presented for the four-layer angle-ply plates and cylindrical shallow shells supported on trapezoidal boundary. The influences of the large amplitude and also of the geometry on the natural frequency are examined.
机译:本文采用瑞利-里兹方法处理四边形叠层板和浅壳的自由挠曲振动。方程是使用板壳的一阶剪切变形理论导出的。非线性仅存在于面内应变分量中。横向剪切应变,曲率和惯性项是线性的。使用自然坐标映射几何。通过在两个参数坐标的每一个中取两个简单多项式的乘积来构造允许的位移场。通过控制这些多项式的系数,可以满足几何边界条件。给出了在梯形边界上支撑的四层角板和圆柱浅壳的数值结果。研究了大振幅以及几何形状对固有频率的影响。

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