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Material characterization of filament-wound composite pipes

机译：长丝缠绕复合管的材料表征

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In obtaining mechanical properties of filament-wound fibre reinforced plastic pipes, standardized tests are often used to obtain bulk properties. Being a laminated composite, individual layers of the lamina will behave differently and therefore pipe-level characterizations are usually unable to fully describe the localised responses in detail. Unlike flat composite layups, obtaining unidirectional ply properties in cylindrical filament-wound composites is not as straight-forward. In this work, the composite pipe stress homogenization theory was applied in reverse to obtain the corresponding ply properties in the filament-wound pipe through successive iterations towards experimentally obtained bulk properties. Initial estimates of ply properties were obtained through a combination of extensive literature search and applications of micromechanics theories. With the iterated ply properties, finite element models simulating the tests used to obtain bulk properties were performed to validate the accuracy of the material properties. In addition, additional validation was performed on a smaller pipe section to evaluate the scalability of using ply properties across pipes of different dimensions. It was found that the ply properties obtained was able to accurately predict the responses for pipes of various dimensions.
机译：为了获得缠绕纤维增强塑料管的机械性能，经常使用标准化测试来获得整体性能。作为层状复合材料，层板的各个层的行为会有所不同，因此管道级特征通常无法完全详细描述局部响应。与平面复合材料铺层不同，在圆柱形长丝缠绕复合材料中获得单向铺层特性并不那么简单。在这项工作中，复合管应力均化理论被反向应用，以通过对实验获得的松散特性进行连续迭代来获得长丝缠绕管中的相应层特性。帘布层性能的初步估算是通过广泛的文献搜索和微力学理论的应用相结合获得的。对于迭代的层板特性，执行了用于获得块状特性的模拟有限元模型，以验证材料特性的准确性。此外，还对较小的管道截面进行了额外的验证，以评估在不同尺寸的管道上使用层板特性的可伸缩性。发现所获得的层特性能够准确地预测各种尺寸的管道的响应。

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