Eggers Frederico, Almeida José Humberto S, Lisbôa Tales V, Amico Sandro C
SENAI Institute of Innovation in Polymers Engineering, São Leopoldo 93025-753, Brazil.
Department of Mechanical Engineering, Aalto University, 02150 Espoo, Finland.
Polymers (Basel). 2020 Dec 23;13(1):33. doi: 10.3390/polym13010033.
This work focuses on the viscoelastic response of carbon/epoxy filament-wound composite rings under radial compressive loading in harsh environments. The composites are exposed to three hygro-thermo-mechanical conditions: (i) pure mechanical loading, (ii) mechanical loading in a wet environment and (iii) mechanical loading under hygrothermal conditioning at 40 ∘C. Dedicated equipment was built to carry out the creep experiments. Quasi-static mechanical tests are performed before and after creep tests to evaluate the residual properties of the rings. The samples are tested in (i) radial compression, (ii) axial compression, and (iii) hoop tensile strength. Different laminates wound at off-axis orientations are manufactured via filament winding and analyzed. Key results show that creep displacement is affected by both hygrothermal and mechanical conditionings, especially at a higher temperature. Moreover, residual properties are quantified showing that creep generates permanent damage in the cylinders.
这项工作聚焦于碳/环氧纤维缠绕复合环在恶劣环境下承受径向压缩载荷时的粘弹性响应。这些复合材料会经历三种湿热-机械条件：（i）纯机械加载，（ii）在潮湿环境中的机械加载，以及（iii）在40℃湿热条件下的机械加载。建造了专门的设备来进行蠕变实验。在蠕变试验前后进行准静态力学测试，以评估环的残余性能。对样品进行（i）径向压缩、（ii）轴向压缩和（iii）环向拉伸强度测试。通过纤维缠绕制造并分析了不同的非轴向外缠绕层压板。关键结果表明，蠕变位移受湿热和机械条件的影响，尤其是在较高温度下。此外，对残余性能进行了量化，结果表明蠕变会在圆柱体中产生永久性损伤。
