ABSTRACT

The structures adopted in the aeronautic field should have three main characteristics: they must be strong, stiff, and light. These targets can be obtained by choosing high performance and low weight materials, as composite or titanium alloy, but also the wise design of the structure itself is important for enhancing the mechanical performances. The isogrid structures, that are composed of a lattice frame reinforcing a skin, represent a very interesting solution to fulfill the abovementioned requirements. In the present work, a comparative analysis of the structural performances of lattice-stiffened cylinders made of different materials was carried out. The studied parts were made of carbon fiber composite material or titanium alloy, while a FEM model was implemented and verified for this study. The cylinder made of composite material was produced through robotic filament winding, an innovative technology that allows the attainment of high-quality parts. It was found that the strength and the stiffness of the structures were almost the same for both the analyzed material, but very interesting results were determined by considering the weight of the different structures: the composite material one resulted to be the most performant since it had the highest specific performances.

摘要

航空领域采用的结构应具有三个主要特征：它们必须坚固，坚固和轻便。这些目标可以通过选择高性能和低重量的材料（例如复合材料或钛合金）来实现，但是结构本身的明智设计对于增强机械性能也很重要。由增强皮肤的格子框架组成的等距结构代表了满足上述要求的非常有趣的解决方案。在本工作中，对由不同材料制成的晶格加劲圆柱体的结构性能进行了比较分析。被研究的零件是由碳纤维复合材料或钛合金制成的，而有限元模型被实施并验证了该研究。复合材料制成的圆柱体是通过自动丝缠绕工艺生产的，这种创新技术可以实现高质量零件的生产。发现两种材料的结构强度和刚度几乎相同，但是通过考虑不同结构的重量可以得出非常有趣的结果：复合材料是一种性能最高的复合材料，因为它具有最高的特定表演。