在三维空间中，球同样是中心对称的。
In three dimensions, a sphere is likewise symmetrical under all rotations about its center.
利用已得到的三维轴对称问题的非局部弹性应力的解，采用级数近似展开的方法，求解环状裂纹的边值问题。
Solves the problem of boundary value on an annular crack by using the nonlocal stress solution of an axisymmetric crack problem and approximative method of series expansion.
本文用三维弹塑性有限元法计算了含圆孔对称复合材料层板的层间应力分布。
In this paper, the interlaminar stress distributions of symmetric composite laminates with a hole are predicted by the three-dimensional elastoplastic finite element method.
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