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基于车用全复合材料CNG气瓶近年发生爆炸事故和定期检验中合格率偏低,主要问题在于气瓶内胆存在裂纹、开裂等缺陷。应用ANSYS有限元软件对现役全复合材料气瓶进行模拟,采用自上而下的建模方法,对全复合材料CNG气瓶进行建模,计算、分析全复合材料CNG气瓶在工作压力、试验压力、爆破压力下的应力、应变分布。模拟计算结论为现役全复合材料CNG气瓶出现的裂纹、开裂等缺陷与内胆材料强度不足和气瓶结构设计密切相关。全复合材料CNG气瓶的设计制造阶段要充分考虑内胆材料强度,合理选材,进一步完善气瓶瓶身与瓶阀过渡区域的结构设计,提出改进检验工艺方案。
Due to the low passing rate of CNG cylinders for automobile composite materials during recent explosions and periodic inspections, the main problem lies in the defects of cracks and cracking in the inner liner of gas cylinders. The ANSYS finite element software was used to simulate the active composite gas cylinders. The top-down modeling method was used to model the CNG gas cylinders with all composite materials. Stress, stress and strain distribution under burst pressure. The simulation results show that the defects such as cracks and cracking appeared in the active CNG cylinder are closely related to the strength of liner material and the cylinder structure design. All composite CNG cylinder design and manufacture stage to fully consider the liner material strength, rational selection, to further improve the cylinder bottle and bottle valve transition region of the structural design, improve the inspection process scheme.