一种复合材料桁架的制备及弯曲承载性能分析

Fabrication and bending bearing capacity analysis of an integrated manufacturing composite truss

为提高复合材料桁架成型几何精度和杆件连接效率,提出一种一体化成型的复合材料桁架制备方法,同时设计了杆件固定工装,通过胶接薄壳、缠绕纤维束和包裹织物实现杆件连接,制备过程表明该制备方法操作性强、稳定性好,制备桁架几何精度高;通过3点弯曲实验和有限元仿真分析了桁架的弯曲承载性能.结果表明:杆件连接效率高,桁架比弯曲刚度高;基于简化模型的有限元模拟方法计算效率高,结果可靠,可用于桁架弯曲刚度的表征.

An innovative fabrication method of integrated manufacturing composite truss is developed to improve the geometric accuracy and rods connecting efficiency. Unlike previous research, the rods are connected by bonding composite shell, winding fiber tow and wrapping fabric together with the designed rod fixture. Fabrication process demonstrates good operability and stability of truss manufacture and advanced geometry accuracy of fabrication. Three-point bending test on bending bearing capacity of the truss suggests a high specific bending stiffness with rods connection of high efficiency. In addition, consistent results from a finite element simulation based on a simplified model show its potential in high computational efficiency to evaluate the bending stiffness of the truss.