耦合效应对复合材料圆锥壳稳定性的影响

The Influence of Coapling Effect on Buckling of Composite Circular Conical Shells

本文以Donnell扁壳型理论为基础,采用混合型理论,应用能量变分法分析了在均匀分布外压作用下连续纤维缠绕复合材料截頂圆锥壳体的稳定性问题,重点分析了拉扭、弯扭等耦合效应对临界外压的影响,得到了临界外压的近似表达式.数值结果表明,在考虑了这些耦合效应的影响后,临界外压值有所降低,且更接近实验结果.

In this paper,based on the Donnell-type shallow shell theory,buckling of composite circular conical shells under external pressure is studied by unsing energy variation principle and the mixed—type theory developed by the same authors. The emphasis is plaed on the influence of tension—twist and bending—twist effects on the buckling behaviour. The formulas for critical external pressure are obtained. Numerical results show that the value of theoretical prediction of critical prersure will be lower a little and closer to the experimental data when the coupling effects are considered. The obtained results are very useful in aeronautical and astronautical structure design.