复合材料圆筒壳及气瓶的有限元分析与研究

发布时间：2018-04-12 11:13

本文选题：复合材料 + 圆筒壳　；参考：《北京化工大学》2012年硕士论文

【摘要】：本论文的研究内容分为复合材料圆筒壳及气瓶两个部分。对于复合材料圆筒壳的研究，分为静态分析和准静态分析。本论文首先在ANSYS有限元软件中建立了带有和不带有端部加强层的复合材料圆筒壳有限模型，分析了在一定的压缩载荷和不同缠绕角度下这两种圆筒壳的轴向压缩模量的变化趋势，并研究了带有端部加强层圆筒壳的径向位移和层间剪应力，预测了其破坏形式，且建议在相同条件下，为了抵抗轴向压缩，应尽量采用小角度缠绕；然后对含预裂纹的复合材料圆筒壳进行了准静态条件下的轴向压缩试验，观察了其破坏形貌，记录了载荷-位移曲线，接着基于ANSYS/LS-DYNA建立了复合材料圆筒壳轴向压缩渐进损伤有限元模型，进行了准静态分析，同样观察了其破坏形貌，模拟出了载荷-位移曲线，将有限元结果与试验结果进行了比较，二者吻合较好。对于复合材料气瓶的研究，分为应力应变分析和爆破分析。本论文在ABAQUS有限元软件中建立了复合材料气瓶有限元模型，建模时考虑封头段只进行螺旋缠绕，以及其缠绕角度与缠绕厚度随平行圆半径不同而变化的情况，分析了复合材料气瓶经过自紧处理后各个工况下的应力和内衬的等效塑性应变，并依据《DOT CFFC》标准评定了气瓶的应力分布，证明了其合理性，，且由内衬的等效塑性应变分布确定了自紧处理的有效作用范围；对复合材料气瓶进行的爆破压力预测依据的是最大应力准则和最大应变准则，并证明了采用最大应变准则预测的结果较为接近标准中的值。
[Abstract]:The content of this thesis is divided into two parts: composite cylinder shell and gas cylinder.The research of composite cylindrical shell is divided into static analysis and quasi static analysis.In this paper, a finite model of composite cylindrical shell with and without end stiffeners is established in ANSYS finite element software.The variation trend of axial compression modulus of the two cylindrical shells under certain compression loads and different winding angles is analyzed. The radial displacement and interlaminar shear stress of the shell with end reinforced layer are studied, and the failure modes are predicted.It is suggested that in order to resist axial compression under the same conditions, small angle winding should be used as far as possible, and then the axial compression tests of composite cylindrical shells with pre-cracks are carried out under quasi-static conditions, and the failure morphology is observed.The load-displacement curve is recorded, and then the finite element model of progressive axial compression damage of composite cylindrical shell is established based on ANSYS/LS-DYNA. The quasi-static analysis is carried out. The failure morphology is also observed and the load-displacement curve is simulated.The finite element results are compared with the experimental results and the results are in good agreement with each other.The research of composite gas cylinder is divided into stress strain analysis and blasting analysis.In this paper, the finite element model of composite gas cylinder is established in the ABAQUS finite element software. In the modeling, only spiral winding is considered in the head segment, and the winding angle and thickness vary with the radius of the parallel circle.The stress and the equivalent plastic strain of inner liner of composite gas cylinder after self-tightening treatment were analyzed, and the stress distribution of gas cylinder was evaluated according to < DOT CFFC > standard, and the rationality of the stress distribution was proved.The effective range of self-tightening treatment is determined by the equivalent plastic strain distribution of the liner, and the blasting pressure prediction of composite cylinder is based on the maximum stress criterion and the maximum strain criterion.It is proved that the results predicted by the maximum strain criterion are close to the values in the standard.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH49

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