Structure determination and composite wing spar stress-strain state estimation

The paper presents the results of studies on the stress-strain state of composite wing spars with different lay-up structures. The object of research is a U-shaped cross-section composite wing spar. On the basis of the analysis of the stress-strain state, the most favorable structure of a wing spar from the viewpoint of minimizing the risk of stress state and providing the highest stiffness. Recommendations are given on lay-up structure stacking (compared with typical structures) for more effective perception of external loads by a wing spar.