铺层复合材料风扇叶片榫头层间应力分析

采用有限元方法对复合材料风扇叶片榫头在拉伸及拉弯耦合工况下的层间应力特点进行研究。根据榫头结构特点,完成了榫头的铺层设计;基于FiberSIM-ACP软件平台,建立了复合材料风扇叶片榫头有限元分析流程,确定了一种满足层间应力分析精度要求的榫头有限元模型,通过与试验结果对比,证实了该有限元模型的有效性。计算结果表明:拉伸工况下层间正应力S33的高应力区位于叶身开始向叶根过渡的变厚度位置,该位置处靠近压力面的14层铺层承受拉伸应力;切应力S13及S23的高应力区在同一区域,切应力大小与铺层角度息息相关,0°铺层承受较大的切应力S13,±45°铺层同时承受较大的切应力S13和S23。增加弯曲载荷后S33的高应力区向榫头上端延伸,承受拉应力的铺层数量增加;切应力的高应力区靠近榫头承力面,高应力区铺层数量增加。

Inter-laminar stress analysis of laminated composite fan blade dovetail

The finite element simulation technique was used to study the inter-laminar stress characteristics of dovetail under tensile and tension and bending coupling conditions. Based on the FiberSIM-ACP interaction module, the finite element modeling and inter-laminar stress analysis process of the fan blade dovetail were established. A finite element model of the fan blade dovetail satisfying the requirements of inter-laminar stress analysis accuracy was determined. The effectiveness of the finite element model was verified by comparison with the experimental results. Results showed that the high stress area of S33 under the tensile condition was located at the variable thickness position of the dovetail, 14 layers near the pressure surface were subjected to tensile stress; the high stress zones of S13 and S23 were in the same region, the shear stress was closely related to the ply angle, the 0° ply was subjected to a large shear stress S13, the ±45° ply was simultaneously subjected to large shear stresses S13 and S23.The high stress area of the S33 between the layers was extended to the upper end of the dovetail after adding the bending load, and the number of layers subjected to tensile stress increased; the high stress area of the shear stress was close to the bearing surface of the dovetail, and the number of layers in the high stress area also increased.