随着航空科学技术的发展，复合材料在飞机结构中的应用越来越广泛。为了减轻结构重量，匹配不同的面内载荷和弯曲载荷，改变层合板的厚度势在必行，而这种厚度的改变可以通过减层来实现。但是，层合板铺层递减会造成结构几何不连续，加上剪切滞后效应的影响，会导致复合材料结构内部和局部应力集中。本文采用有限元分析软件ABAQUS，应用三维HASHIN准测，对复合材料结构铺层递减的斜率和递减方式两种因素对结构性能的影响进行了分析，最后给出了设计建议。%As the developing of astronautics technology, composite is more and more popular in aircraft structure. For the saving weight consideration, thickness variations accomplished by dropping plies along the length are necessary to match varying in-plane and bending load. Unfortunately, these ply drops produce internal and local stress concentrations as a consequence of geometric discontinuities and shear lag. In this study, with the help of Commercial ifnite element software ABAQUS and applying three-dimensional HASHIN Failure criteria, the inlfuence to structure performance of slope and mode of ply drops is explored. Finally,some recommendations about structure design are given.
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