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该文针对含有开孔和孔边补强的蜂窝夹芯复合材料层合结构的屈曲分析发展了一套三维有限元求解方案。孔边缘应力集中区采用W ilson非协调实体单元模拟,同时为减小求解规模,远离开孔的应力平缓区则采用一种相对自由度层合壳元。这种单元避免了传统壳元的转动自由度,易与三维实体单元连接,使变厚度、带有补强的复合材料层合壳体等复杂结构得以正确建模。数值算例验证了该文计算策略的准确性和有效性,最后通过大量数值计算研究了开孔和补强对结构临界载荷的影响。
In this paper, a set of three-dimensional finite element solution is developed for the buckling analysis of honeycomb sandwich composite laminates with openings and holes reinforced. Hole edge stress concentration area using W ilson non-coordinated solid element simulation, and to reduce the size of the solution, away from the hole in the stress-relief zone is a relative degree of freedom laminated shell element. This unit avoids the rotational freedom of traditional shell elements and is easily connected to three-dimensional solid elements, enabling the accurate modeling of complex structures such as variable thickness, laminated composite shells with reinforcement. Numerical examples show the accuracy and validity of the proposed method. Finally, the numerical calculation of the influence of opening and reinforcement on the critical loads of structures is carried out.