轻质点阵夹层圆柱壳的设计与分析

目前,蜂窝夹层和泡沫夹层的圆柱壳比较常见,而具有更高比刚度和比强度的拉伸主导型点阵材料的夹层圆柱壳却鲜有报道。该文对点阵夹层圆柱壳的力学性能进行了研究,利用点阵材料的均质化等效理论,建立了点阵夹层圆柱壳的刚度模型和强度模型,并与有限元商业软件的计算结果进行了对比验证。结果表明,拉伸主导型点阵材料作为芯子的圆柱壳具有比传统蜂窝芯子圆柱壳更好的力学性能,相同承载能力下可实现减重25%以上。利用缠绕与二次固化成型工艺,制备了双蒙皮点阵夹层圆柱壳结构。试验表明,该结构的承载力和刚度比国外同等尺寸和重量的网格加筋圆柱壳提高了3倍以上。

Design and analysis of light-weight lattice sandwich cylinders

Sandwich cylinders have good mechanical strength and are relatively light,which results in many applications of these structural materials in aerospace and aviation engineering.Honeycomb or foam sandwich cylinders are quite common nowadays,but stretching dominated lattice sandwich cylinders having a higher specific stiffness and specific strength are rarely reported.The effective properties homogenization theory of lattice materials was used to build analytical models to predict the axial stiffness and effective yield strength of lattice sandwich cylinders.Finite element simulations verified the model validity.The results show that the sandwich cylinders with stretching dominated lattice materials have better mechanical properties than honeycomb sandwich cylinders and can achieve 25% weight loss for the same carrying capacity.Filament winding and twice co-curing processes can be used to make carbon fiber reinforced composite(CFRC) lattice sandwich cylinders.Axial compression experiments were used to measure the stiffness and load capacity of fabricated sandwich cylinders.The experimental results also show that the bearing capacity and stiffness of lattice sandwich cylinders increase to three times that of the grid stiffened cylinders with similar dimension and weight.