Predictive models play an important role for increasing the reliability of composite structures over time, but a great deal of experimental data is requested. In this paper, results from creep experiments on uniaxial E‐glass fiber reinforced polymer (FRP) single ply laminates, performed at different stress levels, are presented. The tests duration was of 42 months. Analytical modeling of the viscous behavior of the tested GFRP composite, under linear and nonlinear viscoelastic hypotheses, is reported. A discussion on the comparison of creep strain response by Burgers model, with parameters obtained from fitting of data for different test duration, is also proposed. Finally, predictive finite element method (FEM) simulations were carried out for discussing the deferred behavior induced by creep, for composite layers used for repair purposes in hydrogen transportation pipes. Numerical results highlighted a non‐negligible difference in creep strain values, pointing out that a model based on experimental tests with shorter duration leads to a conservative composite design.

中文翻译：

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玻璃纤维增​​强聚合物复合材料的蠕变响应的实验研究和数值模拟

预测模型对于随着时间的推移提高复合结构的可靠性起着重要的作用，但是需要大量的实验数据。本文介绍了在不同应力水平下对单轴E玻璃纤维增​​强聚合物（FRP）单层层压板进行蠕变试验的结果。测试持续时间为42个月。报告了在线性和非线性粘弹性假设下，测试的GFRP复合材料的粘性行为的分析模型。还提出了通过Burgers模型比较蠕变应变响应的讨论，该模型具有从不同测试持续时间的数据拟合中获得的参数。最后，进行了预测性有限元方法（FEM）仿真，以讨论蠕变引起的延迟行为，用于氢运输管道中用于维修目的的复合层。数值结果突出了蠕变应变值的不可忽略的差异，指出基于实验测试且持续时间较短的模型导致了保守的复合设计。