70MPa车载Ⅳ型储氢气瓶铺层设计与实验验证

Layered Design and Experimental Verification of 70 MPa Vehicle-Mounted TypeⅣHydrogen Storage Cylinder

为了准确预测封头纤维厚度和改善封头纤维堆积,采用理论分析、有限元模拟和实验验证相结合的方式,提出了一种结合三次样条函数封头厚度预测法与扩孔缠绕工艺的碳纤维全缠绕复合材料气瓶铺层设计方法。根据设计结果,基于ANSYSACP软件建立了工作压力70MPa的塑料内胆复合材料气瓶有限元模型,分析了气瓶复合材料层在公称工作压力和最小爆破压力下的受力情况。以三维Hashin失效准则作为复合材料失效判据,采用Camanho提出的单元刚度退化方案,对复合材料气瓶进行渐进失效分析,从而预测了气瓶最终爆破压力和爆破位置。进行了气瓶水压爆破实验,实验结果表明:气瓶在未爆破的情况下已能承载158.75MPa的压力,验证了该铺层方法能够满足静强度要求;实验结果未能验证渐进失效分析预测的爆破压力165.71MPa和爆破失效位置。研究成果可为70MPa车载塑料内胆复合材料气瓶的研发提供依据。

To accurately predict the dome fiber thickness and alleviate dome fiber accumulation,this paper proposes a method for layered design of carbon fiber fully-wound composite gas cylinder through theoretical analysis,finite element stimulation and experimental verification.This method combines prediction of cubic spline function dome thickness and reaming winding process.According to the design results,a finite element model is established for the plastic lining carbon fiber fully-wound composite cylinder under a working pressure of 70 MPa using ANSYS ACP software,and its stress distribution under nominal operating pressure and minimum blasting pressure is analyzed.The progressive failure analysis of composite cylinder is carried out and its final burst pressure and position predicted using the three-dimensional Hashin failure criterion in combination with the element stiffness degradation scheme proposed by Cananho.Finally,the hydraulic blasting test of the cylinder is carried out.The experimental results show that the cylinder can bear a pressure of 158.75 MPa without blasting,which means the layered design method can meet the requirement of static strength.However,the test results fail to verify the blasting pressure of 165.71 MPa and blasting failure location predicted by progressive failure analysis.The research results serve a basis for the research and development of 70 MPa vehicle-mounted plastic lining composite cylinder.