基于非经典梁理论的复合管道抗弯刚度特性分析

Analysis of Flexural Stiffness of Composite Pipe Based on Non-Classical Beam Theory

含薄壁内衬的碳纤维增强复合管道的抗弯刚度主要由碳纤维增强层决定,由于单向纤维复合材料多角度铺层引起的复杂耦合效应,复合管道的抗弯刚度难以精确计算。本文根据高压气体输送管道的结构特点和受力特性,基于复合材料力学、弹性力学进行复合管道的抗弯刚度计算,并进行了复合管道有限元模拟,对比分析了理论计算和有限元法在纯弯曲状态下,缠绕角、铺层顺序对复合管道抗弯刚度的影响。

The flexural stiffness of the carbon fiber reinforced composite pipe with thin-walled lining is mainly determined by the carbon fiber reinforced layers. Due to the complex coupling effect caused by multi-angle laying of unidirectional fiber composites, the flexural stiffness of composite pipe is difficult to calculate accurately. Based on the structural characteristics and mechanical properties of high pressure gas pipeline, the flexural stiffness of composite pipe is calculated based on the mechanical and elastic mechanics of composite materials, and the finite element simulation of composite pipe is carried out. The influence of the theoretical calculation and the finite clement method on the flexural stiffness of the composite pipe under the pure bending state is compared and analyzed.