Abstract The mechanical properties of fiber-reinforced composites are time-dependent, in which both strength and stiffness are time-dependent due to the inherited nature of polymers, i.e. viscoelasticity. This study covers the creep/recovery and dynamic mechanical properties of high-performance composites under low-stress loading. Flat unidirectional 6-layer laminates were manufactured by dry-filament winding and cured under hot compression. Four different laminates-are studied: [0]6, [30]6, [60]6 and [90]6. Dynamic mechanical curves and creep behavior are highly dependent on the ply angle up to 60°, mainly for the storage modulus and higher strain in creep/recovery test. The glass transition temperature is influenced by the fiber orientation. Normalized dynamic mechanical curves are plotted aiming to study the behavior of the material passing through the glass transition temperature (Tg) peak. Despite the high modulus for the longitudinally oriented composite, a catastrophic failure could occur because the energy is dissipated in a narrow temperature range. On the other hand, the modulus decreases for angles towards the transverse direction, but the energy dissipation occurs in a broader temperature range. Creep/recovery also demonstrates a dependency on the fiber orientation, in which for higher storage modulus ([0]6), there is a higher resistance for strain – leading higher molecular hindrance compared with the other laminates.

中文翻译：

---

碳纤维增强环氧长丝缠绕层压板的粘弹性特性

摘要 纤维增强复合材料的力学性能是随时间变化的，其中由于聚合物的遗传特性，即粘弹性，强度和刚度都随时间变化。本研究涵盖了高性能复合材料在低应力载荷下的蠕变/恢复和动态力学性能。扁平单向 6 层层压板通过干纤维缠绕制造并在热压缩下固化。研究了四种不同的层压板：[0]6、[30]6、[60]6 和 [90]6。动态力学曲线和蠕变行为高度依赖于高达 60° 的层板角度，主要用于蠕变/恢复测试中的储能模量和更高的应变。玻璃化转变温度受纤维取向的影响。绘制归一化动态力学曲线，旨在研究材料通过玻璃化转变温度 (Tg) 峰的行为。尽管纵向取向的复合材料具有高模量，但由于能量在狭窄的温度范围内耗散，因此可能会发生灾难性的故障。另一方面，对于横向方向的角度，模量会降低，但能量耗散发生在更宽的温度范围内。蠕变/恢复还表明对纤维取向的依赖，其中对于更高的储能模量 ([0]6)，有更高的应变阻力 - 与其他层压板相比，导致更高的分子阻碍。由于能量在狭窄的温度范围内耗散，因此可能会发生灾难性故障。另一方面，对于横向方向的角度，模量会降低，但能量耗散发生在更宽的温度范围内。蠕变/恢复还表明对纤维取向的依赖，其中对于更高的储能模量 ([0]6)，有更高的应变阻力 - 与其他层压板相比，导致更高的分子阻碍。由于能量在狭窄的温度范围内耗散，因此可能会发生灾难性故障。另一方面，对于横向方向的角度，模量会降低，但能量耗散发生在更宽的温度范围内。蠕变/恢复还表明对纤维取向的依赖，其中对于更高的储能模量 ([0]6)，有更高的应变阻力 - 与其他层压板相比，导致更高的分子阻碍。