车用压缩天然气全缠绕复合材料气瓶强度试验及数值模拟

Testing research and numerical simulation on full filament-wound composite cylindrical vessel filled with compressed natural gas used in automobile

对压缩天然气燃料汽车气瓶进行水压试验,考核其承压部件的强度,同时进行爆破试验,以确定其最小爆破压力和爆破部位.考虑了复合材料各向异性以及气瓶封头处纤维缠绕厚度变化的特点,采用有限元分析软件对车用压缩天然气全缠绕铝内衬复合气瓶在预紧压力、0压力、工作压力、水压试验压力和最小爆破压力作用下的应力分布情况对比国外相应标准进行了分析和研究,预测出该气瓶的实际爆破压力.结果证明,有限元分析的结果与实际情况吻合得较好.

The strength of pressure components of cylindrical vessel filled with compressed natural gas used in automobile was examined by hydraulic test.The bursting pressure test was also conducted to define its burst pressure and location.Considering the anisotropy of composite materials,as well as the change of filament-wound thickness at cylindrical head,the stress distributions in each of the processes of prepressure,zero pressure,operating pressure,hydraulic pressure and bursting pressure were obtained by using finite element analysis（FEA）,respectively,and compared with the other standards in the codes.The actual bursting pressure was also predicted.It is also shown the results of FEA are in good agreement with those of the tests.