T700碳纤维增强树脂复合材料气瓶封头非测地线缠绕强度

Non-geodetic winding strength of T700 carbon fiber reinforced resin composite cylinder head

利用微分几何理论和四阶龙格库塔法求解气瓶封头上T700碳纤维增强树脂复合材料(CFRP)非测地线缠绕角微分方程,得到稳定的非测地线缠绕轨迹;利用有限元仿真软件建立T700CFRP缠绕气瓶有限元模型,分析不同非测地线轨迹对工作压力(30MPa)下T700CFRP缠绕气瓶强度的影响,并采用渐进损伤模型分析爆破压力的变化规律。对于封头高h=50mm的T700CFRP缠绕气瓶,滑线系数为0.2时承载能力最强,比T700CFRP测地线缠绕气瓶提高了7MPa,约为6.4%;对于封头高h=160mm的T700CFRP气瓶,滑线系数为0.2时承载能力最强,比T700CFRP测地线缠绕气瓶提高了6MPa,约为11.5%。结果表明,优化设计得到的缠绕线型既能满足缠绕工艺的基本要求,又提高了T700CFRP缠绕气瓶的结构力学性能,可为实际缠绕工艺提供参考。

Using differential geometry theory and the fourth-order Runge-Kutta methods to solve non-geodetic winding angle differential equation of T700carbon fiber reinforced resin composite(CFRP)in cylinder head,a stable non-geodetic winding trajectory was obtained.Using the finite element simulation software to build the finite ele-ment model of T700(CFRP)winding cylinder,the influence of different non-geodetic trajectories on the strength of T700CFRP winding cylinder under working pressure was analyzed.The progressive damage model was used to ana-lyze the law of burst pressure.For T700CFRP winding cylinder with head of 50mm,the T700winding cylinder bearing capacity is the strongest when the slippage coefficient is 0.2,which is 7 MPa higher,about 6.4%,com-pared with T700CFRP geodesic winding cylinder.For geodesic winding cylinder with head of 160mm,the T700 CFRP winding cylinder bearing capacity is the strongest when the slippage coefficient is 0.2,which is 6MPa high-er,about 11.5%,compared with T700CFRP geodesic winding cylinder.The results show that the optimized wind-ing design can meet the basic requirements of the winding process,improve the structural mechanical properties of the T700CFRP winding cylinder,and provide reasonable suggestions for the actual winding process.