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Strength Analyses and Optimal Designs of Hybrid Sanwich Circulat Cylindrical Shells

混合三明治循环圆柱壳的强度分析与优化设计

基本信息

批准号：
60550044
负责人：
BEN Goichi
金额：
$ 0.9万
依托单位：
Nihon university
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

项目摘要

In order to design optimal hybrid composite sandwich circular cylindrical shells, two cases were analysed in this report.1. The buckling of hybrid FRP sandwich circular cylindrical shells under axial compression was analysed, which had both faces with different orthotropies and thickness.In a particular case of sandwich cylinders with soft core having low shear rigidity , an explicit expression for buckling load with axially symmetric mode could be presented. In order to verify the above analyses, experiments were carried out on the three kinds of hybrid sandwich cylinders which have aluminum inner face, filament-wound or aluminum outer face and polyurethane formed core, which would be useful for the low-temperature liquid container. It was found that the buckling took place in shear mode in core with almost the same values as predicted in the analyses.2. The buckling of the filament wound GFRP circular cylindrical shells under the four points bending load was analysed by FEM. The linear incremental method also was used to obtain the non-linear behavior of the filament wound circular cylinders,for example the relation of loads and deflections. In order to verify the above analysis , the experiment was carried out on the filament wound GFRP circular cylinder. It was found that the maximum bending load was in good agreement with the buckling load as predicted by FEM.

为了设计出最优的混合复合材料夹层圆柱壳，本报告对两种情况进行了分析： 1．对具有不同正交各向异性和厚度的混合FRP夹芯圆柱壳在轴向压缩下的屈曲进行了分析。在具有低剪切刚度的软芯夹层圆柱壳的特殊情况下，可以给出轴对称模式的屈曲载荷的显式表达式。为了验证上述分析，对用于低温液体容器的铝内表面、纤维缠绕或铝外表面、聚氨酯成型芯三种混合夹层圆筒进行了实验。结果发现，岩心发生了剪切模式的屈曲，其值与分析预测的值几乎相同。 2．采用有限元分析方法对纤维缠绕GFRP圆柱壳在四点弯曲载荷作用下的屈曲进行了分析。线性增量法也被用来获得纤维缠绕圆柱体的非线性行为，例如载荷和挠度的关系。为了验证上述分析，在纤维缠绕GFRP圆柱体上进行了实验。结果发现，最大弯曲载荷与有限元预测的屈曲载荷非常一致。