By using the method of small parameter expansions the present boundary-value problem is solved. Thus the formula in the second approximation for the stress field is obtained.
本文运用小参数展开法求解了这一大变形问题，获得应力场的二级近似公式。
The second approximation of the solution is of the same accuracy as theory of thin shells, and the first approximation is also sufficiently precise for engineering computation.
二次近似解达到薄壳理论所具有的精度，一次近似解也具有足够精度。
According to the dual theory, the dual programming was used to map the original problem exactly and the second approximation of the dual problem was set up by Taylor's expansion.
根据对偶理论，应用对偶规划精确映射原问题，再按泰勒展式建立对偶问题的二阶近似。
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