复合材料尾翼结构的稳定性分析及补强设计

Stability analysis and reinforcement design of the composite tail structure

基于MSC.MARC非线性有限元计算软件,针对复合材料垂尾结构进行了非线性稳定性计算。选用复合材料第1层和最后一层的应力绘制出应力随加载变化的曲线,该曲线不但能准确判断失稳临界点,而且还能形象地描述屈曲窝的形成过程。最后,依据蒙皮局部失稳后载荷的转移情况,综合考虑补强效果、结构增重及制造工艺等因素,选用在屈曲窝处布置纵向加强筋的补强方式进行稳定性补强。

Based on MSC.MARC nonlinear finite element calculation software,the nonlinear stability calculation of the composite vertical tail structure is carried out.The stress in the first layer and the last layer of the composite are selected to draw the stress-loading curve,this curve not only can judge the critical point of instability,but also can describe the deformation course of buckling pits visually.Finally,depending upon the load transfer condition of local skin instability,the factors as enforcement effect,structure weighting,manufacturing process and etc.are taken into account comprehensively,the method to carry out stability enforcement was selected by configuring the longitudinal enforcing bars on buckling pits.