复合材料缝编肋片的分析

为了提高复合材料机翼的整体强度和刚度, 降低制造成本, 机翼的主要结构件采用缝编技术。肋片由肋腹板、缘条组成, 它是由整块缝编层合板剪裁加工制成。肋水平缘条和垂直缘条分别缝纫于蒙皮及桁腹板上, 桁缘条也缝纫于蒙皮上。采RTM 工艺成型。当在肋腹板方向施加拉力后, 肋水平缘条和蒙皮之间存在着剪应力, 引起层合板的分层, 肋垂直缘条和桁腹板之间存在着拉应力, 引起它们之间的撕裂。采用了二维和三维有限元混合模型进行分析, 获得了肋水平缘条与蒙皮、以及肋垂直缘条与桁腹板交界面上的应力分布, 并由试验研究验证了分析计算的正确性。 

ANALYSIS OF COMPOSITE STITCHED INTERCOSTAL

To increase the whole strength and stiffness of the composite wing and to lower the manufacturing cost, the main component of the wing is employed with stitched technique. Intercostal is made from web and flanges, and is tailored from a whole knitted stitched laminate plate. Intercostal horizontal and vertical flanges are stitched on the skin and stringer blade respectfully; stringer flanges are stitched on the skin; then they can be integrated into structure by RTM. Direction of applied tension is on the intercostal web. There is shear stress between intercostal horizontal flanges and skin, causing slip delamination. There is tension stress between intercostal vertical flange and stringer blade, causing tensile delamination. Using a mixed 2D/3D FE model to the analysis gives the interface stress distribution among the intercostal, skin and stringer blade; the correctness of the analysis and calculation is also proved by test.