混杂纤维CNG2气瓶有限元分析及疲劳寿命预测
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摘要
推广燃气汽车对于雾霾治理和综合利用清洁能源具有重要意义。在建立碳/玻混杂纤维CNG2气瓶有限元模型的基础上,分析了内胆及纤维层在未经预紧和经过预紧两种情况下的应力差异,通过提取内胆筒体段危险点在载荷历程中的名义应力强度,计算了低周疲劳载荷作用下的局部应力应变,结合Manson-Coffin公式计算得到疲劳寿命。计算结果表明,未经预紧情况下,碳纤维的混入可以使气瓶的疲劳寿命提高7%,同时改善内胆局部应力集中,而经过预紧工艺的混杂纤维气瓶的疲劳寿命则进一步提高19%。
Promoting gas vehicles is of great significance for haze treatment and use of clean energy. On the base of establishing a carbon/glass hybrid fiber CNG2 gas cylinder finite element model,the stress difference about liner and fiber layer under two conditions,without preloading and preloading,is analyzed. By reading the nominal stress intensity of the dangerous point of the liner cylinder during loading history,the local stress and strain under low cyclic fatigue loading are calculated firstly,and then the fatigue life is calculated by combining Manson-Coffin formula. The calculation results show that blending with carbon fiber can increase the fatigue life of cylinders by 7%in the absence of preloading. Meanwhile,the local stress concentration of the liner is improved. The fatigue life of pre-tightened hybrid fiber cylinders is further increased by 19%.
Promoting gas vehicles is of great significance for haze treatment and use of clean energy. On the base of establishing a carbon/glass hybrid fiber CNG2 gas cylinder finite element model,the stress difference about liner and fiber layer under two conditions,without preloading and preloading,is analyzed. By reading the nominal stress intensity of the dangerous point of the liner cylinder during loading history,the local stress and strain under low cyclic fatigue loading are calculated firstly,and then the fatigue life is calculated by combining Manson-Coffin formula. The calculation results show that blending with carbon fiber can increase the fatigue life of cylinders by 7%in the absence of preloading. Meanwhile,the local stress concentration of the liner is improved. The fatigue life of pre-tightened hybrid fiber cylinders is further increased by 19%.
引文
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[3]王泽邦. CNG加气站控制管理系统的研究与设计[J].自然科学:全文版,2016(7):199-199.
[4]黄再满,蒋鞠慧,薛忠民,等.复合材料天然气气瓶预紧压力的研究[J].玻璃钢/复合材料,2001(5):29-32.
[5]方敏,刘献游,吕涛.车用压缩天然气气瓶爆炸事故原因分析[J].压力容器,2015(12):38-42.
[6]张慧.气瓶爆炸事故在车用压缩天然气的原因分析[J].中国标准化,2017(10).
[7]侯庆辉.一起车用压缩天然气钢质内胆环向缠绕气瓶爆炸事故原因分析[J].特种设备安全技术,2015(3):28-28.
[8]谢志刚,张效迅,卢黎明.环向缠绕混杂碳/玻纤维复合材料气瓶最优混杂比有限元分析[J].上海工程技术大学学报,2011,25(4):304-308.
[9]林再文,李涛,孙浩伟,等.几种纤维复合材料压力容器的性能对比研究[J].纤维复合材料,2005,22(1):21-22.
[10]吴泽敏,马源.玻-碳纤维复合材料气瓶疲劳性能研究及优化分析[J].化工装备技术,2015(2):1-5.
[11]吴泽敏.复合材料气瓶应力分析及性能优化[D].大连:大连理工大学,2015.
[12]郭丽敏,郭志峰,肖文刚,等.复合材料压力容器发展趋势[C]//玻璃钢/复合材料学术年会. 2003.
[13]谢志刚,陈小芹.车用CNG2气瓶金属内胆低周疲劳行为分析[J].工业安全与环保,2014,40(5):48-50.
[14]谢志刚,陈小芹,李方军. CNG2气瓶爆破机理分析与自紧压力优化设计[J].工业安全与环保,2013(1):13-15,37.
[15]张小冬,王耀杰,邓宗才.混杂纤维片材拉伸性能研究[J].国防交通工程与技术,2010,8(1):21-24.
[16]陈汝训.混杂纤维复合材料受拉构件的最优混杂比研究[J].固体火箭技术,2005,28(3):219-221.