扩孔工艺对复合材料气瓶强度的影响

Effect of Reaming Process on Strength of Composite Gas Cylinder

扩孔工艺可以改善复合材料气瓶瓶肩堆积并影响气瓶强度。为了研究该影响规律,首先,通过对比多个气瓶封头厚度的计算方法,组合推出双公式法,该方法能够较准确地模拟气瓶封头纤维层厚度的变化;然后,利用有限元方法建立气瓶渐进损伤模型预测爆破压力,并利用爆破试验验证了模型的准确性。结果表明,适当的扩孔工艺能使封头上纤维厚度极值降低31.53%,且过渡更加均匀;爆破压力下,封头内胆上的Mises应力整体下降且在瓶口下降更为显著,Mises应力曲线更加平滑;气瓶整体极限承载能力提高2.68%。

Reaming process can improve the stacking of composite gas cylinder shoulder and influence the strength of composite gas cylinder.In order to study the influence rule,firstly,a double formula is introduced by comparing the calculation methods of thickness of several composite gas cylinder heads.This formula can accurately simulate changes in fiber layer thickness of composite gas cylinder head.Then,a progressive damage model is built to predict the burst pressure using the finite element method,and the accuracy of the model is verified by burst test.The results show that appropriate reaming process can reduce the extremum value of fiber thickness on the head by 31.53% and make the transition more uniform.Under the burst pressure,the Mises stress on the liner of the composite gas cylinder head decreases as a whole and drops more significantly in the cylinder mouth,and the Mises stress curve is smoother.The ultimate load capacity of the composite gas cylinder is increased by 2.68%.