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Buckling reliability analysis of liner with initial defects on composite overwrapped pressure vessel based on response surface method

DOI：10.7511/jslx20220424002

 作者 单位 E-mail 张国 大连理工大学 工程力学系, 大连 116024 zhangguo@ctic.cn 刘宇琛 大连理工大学 工程力学系, 大连 116024 张笑闻 大连理工大学 材料科学与工程学院, 大连 116024 薛姝楠 大连理工大学 工程力学系, 大连 116024 任明法 大连理工大学 工程力学系, 大连 116024大连理工大学 工业装备结构分析国家重点实验室, 大连 116024 李刚 大连理工大学 工程力学系, 大连 116024大连理工大学 工业装备结构分析国家重点实验室, 大连 116024

具有初始缺陷的内胆会对复合材料气瓶的服役性能造成严重危害,本文基于响应面法,提出了一种复合材料气瓶含初始缺陷内胆屈曲的可靠性分析方法。建立了铝合金6061内胆的T700/环氧复合材料气瓶的三维有限元模型,实现了复合材料气瓶内胆的收缩屈曲分析。基于响应面方法,构造了复合材料气瓶极限状态方程,并假设结构中的随机变量服从高斯分布,开展了考虑几何尺寸和凹陷尺寸变化的气瓶结构可靠性分析,结果表明,在气瓶内胆加工过程中,直筒段厚度的离散性会严重影响气瓶结构的可靠性;直筒段半径、直筒段长度、封头段半径和封头段厚度在通用加工误差内对气瓶结构的可靠性影响较小;对本文定型气瓶,当内胆表面的凹陷半径超过10 mm,且深度超过2 mm时,气瓶结构的可靠性会严重降低。

The initial defects of the liner will cause serious harm to the service performance of the composite overwrapped pressure vessel (COPV).In this paper,a reliability analysis method for buckling of liner with initial defects of a COPV is proposed based on response surface method.The three-dimensional finite element model of a T700 carbon fiber/epoxy resin COPV with an aluminum alloy 6061 liner is established,and realize the shrinkage buckling analysis of the liner of COPV is realized.Based on the response surface method,the limit state equation of the COPV is constructed.Assuming that the random variables in the structure obey Gaussian distribution,the reliability analysis of the COPV considering the changes of geometric size and depression size is carried out.The results show that:during the processing,the dispersion of the thickness of the cylinder will seriously affect the reliability of the COPV;the radius of the cylinder,the length of the cylinder,the radius of the dome and the thickness of the dome have little influence on the reliability of the pressure vessel within the general processing error.For the type of COPV in this paper,when the depression radius exceeds 10mm and the depression depth exceeds 2mm,the reliability of the pressure vessel will be significantly reduced.