然后利用双三角级数构造满足层板分层区位移边界条件的位移模态。
Then, a trigonometric series is applied to describe the displacement mode satisfying the boundary conditions.
将功能梯度三维矩形板的位移变量按双三角级数展开，以弹性力学的平衡方程为基础，导出位移形式的平衡方程。
The displacement components of a three dimensional functionally graded rectangular plate were expanded in the forms of double trigonometric series.
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