汽车用CNG钢瓶应力与疲劳寿命分析  

Analysis of Wall Stresses and Fatigue Life of the CNG All-steel Cylinder for a Vehicle

作　　者：曾凡苏[1] 章鹏兴[1] 郝静[1] 陈志[1] 李建明[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《压力容器》2011年第3期38-42,共5页Pressure Vessel Technology

摘　　要：通过有限元分析法,验证了计算选用的CNG钢瓶在热-固耦合作用下应力满足GB 150要求,在无表面划痕情况下疲劳寿命满足GB 17258要求。在此前提下,对表面存在划痕的钢瓶进行数值模拟研究,结果表明:缺口应力随缺口深度增加而明显增加,受缺口长度的影响并不显著;钢瓶的疲劳寿命随环向缺口的加深而递减,当缺口加深至1.0 mm后,疲劳寿命耗用系数仍小于1,满足疲劳寿命要求;钢瓶的疲劳寿命随纵向缺口加深而锐减,其影响程度远大于环向缺口,当缺口深度大于0.2 mm后,疲劳寿命耗用系数大于1,不再满足疲劳寿命要求。The CNG all-steel cylinder was proved to meet the require of GB 150 under thermal-solid coupling effect,and the require of GB 17258 without nicks on the surface through the method of the finite element analysis（FEA）.Then the cylinder with nicks on surface was studied by the numerical simulation analysis,and the results show that the notch stress is not significantly influenced by the length of the notch but obviously increased as the depth of the notch increased,the fatigue life of the cylinder decreases when the depth of the longitudinal notch or the circumferential notch increases,but the influence of the former is more notable than the latter.When the depth of the circumferential notch reaches 1.0 mm,the utilization coefficient of the fatigue life is still less than 1,which satisfies the require of the fatigue life,but when the depth of the longitudinal notch exceed 0.2 mm,the utilization coefficient of the fatigue life is more than 1,which no longer satisfies the require of the fatigue life.

关 键 词：CNG钢瓶 应力 疲劳寿命 表面划痕 

分 类 号：TQ205[化学工程—有机化工]