用于AGS结构分析的混合法

结合均匀化模型和加筋单元模型构造了一种混合模型用来分析复合材料格栅加筋板/壳结构（AGS）。所构造的加筋单元模型是一种高性能协调转角独立加筋板壳单元，保持了肋骨和蒙皮位移场的协调性，同时还满足肋骨和蒙皮具有独立转动条件，该单元中肋骨的方向和位置任意。混合法具有精度高、速度快等特点。通过典型算例讨论了肋骨间距和高度对均匀化模型计算结果精度的影响，通过对带孔复合材料AGS板孔边特殊点应力值的分析证明了混合法的有效性。 

New hybrid method for composite grid structures analysis

A new hybrid method by conjunction of the smearing model with the stiffened model is formulated to analyze the composite advanced grid stiffened structures (AGS). The smearing model is homogenizing the stiffness of stiffeners based on the structural mechanics theory and the grid panel therefore can be equivalent to a plate. The stiffened element model is an exact method，which can provide the compatibility between stiffeners and plate. In addition，the numbers and orientation of the stiffeners of the element can be defined randomly by users. The numerical results indicate that the hybrid method is effective and accurate. It is also  known that the smearing model is remarkably affected by the distance and height of the ribs. The limitation of the hybrid method is investigated by simulating the grid-stiffened plate with a central circular cutout.