内胆壁厚变化对环缠绕复合气瓶疲劳性能的影响

复合材料科学与工程 ›› 2014, Vol. 0 ›› Issue (4): 32-36.

内胆壁厚变化对环缠绕复合气瓶疲劳性能的影响

李清婉¹, 邓贵德², 凌祥^1*, 李伟³

1.南京工业大学,南京211816;
2.中国特种设备检测研究院,北京100013;
3.太原理工大学,太原030024

收稿日期:2013-08-01 发布日期:2021-09-17
通讯作者: 凌祥(1967-),男,博士,教授,主要研究方向为新能源技术与装备、过程强化与节能环保装备技术、紧凑式热交换器、微通道热交换器、特种表面处理技术、特种连接技术(钎焊、扩散焊)、高温蠕变损伤与断裂等,Xling@njut.edu.cn。
作者简介:李清婉(1989-),女,硕士研究生,主要研究方向为纤维缠绕复合材料气瓶。本文作者还有寿比南²。
基金资助:
国家公益性行业(质检)科研专项项目(201210020)

EFFECT OF THICKNESS VARIATION OF THEIR LINERS ON FATIGUE PERFORMANCE OF HOOP-WRAPPED COMPOSITE CYLINDERS

LI Qing-wan¹, DENG Gui-de², LING Xiang^1*, LI Wei³

1. Nanjing University of Technology, Nanjing 211816, China;
2. China Special Equipment Inspection and Research Institute, Beijing 100013, China;
3. Taiyuan University of Technology, Taiyuan 030024, China

Received:2013-08-01 Published:2021-09-17

摘要/Abstract

摘要： 受气瓶用无缝钢管壁厚偏差影响,环缠绕复合气瓶内胆实际壁厚可能存在0~+30%的变化。内胆实际壁厚变化会影响复合气瓶的自紧效果,从而影响复合气瓶的抗疲劳性能。采用有限元方法对壁厚不同的钢质内胆玻璃纤维环缠绕复合气瓶进行了应力分析。结果表明,随着内胆壁厚增大,相同自紧压力下内胆预压缩应力减小,工作过程中内胆平均应力增大,这会减弱气瓶的抗疲劳性能;但内胆疲劳交变应力幅减小,这对气瓶的抗疲劳性能又有增强作用。因此,分别基于Goodman和SWT平均应力修正方程,对计算所得的平均应力和疲劳交变应力幅进行了等效处理,两种方法所得等效交变应力幅均随内胆壁厚增大而减小。这表明二者的共同作用对环缠绕复合材料气瓶的抗疲劳性能有小幅度的提高,内胆实际壁厚的增大不会降低环缠绕复合气瓶的抗疲劳性能。

关键词: 复合材料气瓶, 环向缠绕, 疲劳性能, 有限元分析, 壁厚变化

Abstract: Actual thickness of the liners of hoop-wrapped composite cylinders may have a deviation of 0 ~ +30% affected by the thickness variation of seamless steel tubes for cylinders. The variation of the actual thickness of the liner has an influence on the autofrettage effect of the composite cylinders, and may affect the anti-fatigue performance of the cylinders. Finite element method was used to analyze the stress of glass fiber hoop-wrapped composite cylinders with steel liners with different thickness. Numerical results show that hoop pre-stress on liners decreases under the same autofrettage pressure, and the mean hoop stress on liners increases during working process, which weakens the fatigue resistance of the composite cylinders; but the alternating stress amplitude decreases during working process, which improves the anti-fatigue performance of the cylinders. Therefore, both Goodman and SWT equations taking the effect of mean stress into account were utilized to calculate equivalent alternating stress amplitude. The equivalent alternating stress amplitude on the liners from the two methods both decreases slightly as the thickness of the liners increases, which indicates that the combined action of the two can improve the anti-fatigue performance of the composite cylinders slightly. So the positive thickness variation of the liners does not decrease the fatigue resistance of hoop-wrapped composite cylinders.

Key words: composite cylinders, hoop-wrapped, fatigue performance, finite element analysis, thickness variation

中图分类号:

TB332

李清婉, 邓贵德, 凌祥, 李伟. 内胆壁厚变化对环缠绕复合气瓶疲劳性能的影响[J]. 复合材料科学与工程, 2014, 0(4): 32-36.

LI Qing-wan, DENG Gui-de, LING Xiang, LI Wei. EFFECT OF THICKNESS VARIATION OF THEIR LINERS ON FATIGUE PERFORMANCE OF HOOP-WRAPPED COMPOSITE CYLINDERS[J]. COMPOSITES SCIENCE AND ENGINEERING, 2014, 0(4): 32-36.

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