Nowadays, composite pipes, due to their unique properties such as high stiffness to weight ratio and excellent corrosion resistance, play a significant role in the industry. Composite pipes are usually loaded by internal hydrostatic pressure for a long time. Therefore, their long-term creep behavior has been considered as a severe issue. Although the experimental method is a reliable and standard studying method, it is costly and time-consuming, especially in creep studies. Therefore, researchers have been looking for alternative methods. In this regard, the primary purpose of this study is to model the long-term creep behavior of composite pipes considering moisture and impurities, such as short fibers and sand layers (which are commonly used in composite pipes). In this research, a comprehensive approach is provided, relying on available short-term creep experimental data on the pure resin, to predict the long-term behavior of each type of composite, particularly composite pipes. By employing Python script, the high-level algorithm is developed to model the creep behavior of lamina by using the micromechanics model considering the impurity. The effect of stress on the viscoelastic behavior of lamina is modeled. Then creep behavior of a lamina is developed to composite laminates by employing a finite element model. Finally, the failure in the laminated composite is examined. The results predicted by the present study have a good agreement with available experimental data. Results reveal that moisture reduces the lifetime of composite pipes. Furthermore, results are extended for 50 years, and the failure pressure is estimated, which the percent error is 2.6% approximately compared to available experimental data.

如今，复合管由于其独特的性能，如高刚度重量比和优异的耐腐蚀性，在行业中发挥着重要作用。复合管通常长期承受内部静水压力。因此，它们的长期蠕变行为被认为是一个严重的问题。虽然实验方法是一种可靠和标准的研究方法，但它既昂贵又费时，尤其是在蠕变研究中。因此，研究人员一直在寻找替代方法。在这方面，本研究的主要目的是模拟考虑水分和杂质的复合管的长期蠕变行为，例如短纤维和砂层（复合管中常用的）。在这项研究中，提供了一种综合方法，依靠可用的纯树脂的短期蠕变实验数据，预测每种类型的复合材料，尤其是复合管道的长期行为。通过使用Python脚本，开发了高级算法，利用考虑杂质的微观力学模型对层板的蠕变行为进行建模。对应力对层板粘弹性行为的影响进行了建模。然后通过使用有限元模型将层板的蠕变行为开发为复合层板。最后，检查层压复合材料的失效。本研究预测的结果与现有的实验数据具有很好的一致性。结果表明，水分会缩短复合管的使用寿命。此外，将结果扩展到 50 年，并估算出故障压力，其百分比误差为 2。