带缺陷薄壁铝内衬复合气瓶的有限元分析
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萍乡高等专科学校机电系

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FE Analysis of Composite Cylinder With Defect in Thin-Walled Aluminum Liner
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    摘要:

    基于有限元模拟软件MSC. Marc 建立了带内衬缺陷的复合气瓶有限元模型,建模过程中考虑了
    封头处缠绕层厚度和缠绕角沿子午线的不断变化,对封头每个单元分别定义了单元厚度及材料主方向。研究
    了不同位置、尺寸的内衬缺陷对内衬爆破压力、位移、应力及应变分布的影响。结果表明,当夹杂位于封头处
    时,长度<112 mm 的夹杂对内衬的爆破压力无明显影响;而当夹杂位于筒中部和过渡区时,随着夹杂长度的增
    加,内衬的爆破压力明显降低,降低幅度最高达到15%。夹杂周围会产生应力集中,夹杂处位移、应力、应变分
    布不均匀。应变分布规律与应力分布规律基本一致,夹杂周围三向应变等值线会发生弯曲。

    Abstract:

    A finite element model of composite overwrapped pressure vessels (COPV) was established based on
    the FE simulation software MSC. Marc. The variations of thickness and winding angle along the meridian in the domes
    section were considered during modeling. The element thickness and the principal direction of every unit of the domes
    were defined. Then, the influence of defects at different locations with different size on the distribution of displacement,
    stress and strain as well as the burst pressure had been studied. The results demonstrate that the defects with
    the length of 112 mm or less have little effect on the burst pressure in the domes. While at the middle and transition
    section of the liner, the burst pressure decreases with the lowered range of 15% as the length of defect increases. The
    stress concentration and maldistribution of displacement, stress and strain generate around the defects. The distribution
    of strain is consistent with that of the stress. And the isolines of three directions’ strain are bended around the defect
    which affects the bursting pressure as well as the fatigue life.

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胡建军.带缺陷薄壁铝内衬复合气瓶的有限元分析[J].宇航材料工艺,2013,43(3).

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  • 在线发布日期: 2016-11-28
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