Model Simulation of Creep and Thermal Ratcheting of Engineering Polymers,Macromolecular Theory and Simulations

当前位置： X-MOL 学术 › Macromol. Theor. Simul. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Model Simulation of Creep and Thermal Ratcheting of Engineering Polymers
Macromolecular Theory and Simulations ( IF 1.8 ) Pub Date : 2021-09-08 , DOI: 10.1002/mats.202100043
Gerasimos Spathis ₁ , Evagelia Kontou ₁

Affiliation

In the present work, the creep response at specific temperatures and stress level of several polymers has been modeled by a viscoelastic model, analyzed in previous works. In particular, the experimental creep results under thermal cycling of polymers used in bolted flange connections, utilized as components of pressure vessel and piping are employed. The analysis is focused on the experimental results for polymeric flange materials like high density polyethylene and three types of gasket materials, namely poly-tetrafluoroethylene PTFE (expanded e- and virgin v-) and clickable nucleic acid. It has been proved that by the implementation of the model on a simple creep curve at a specific temperature, the model parameters could be evaluated. Hereafter, by imposing a thermal cycling process, two more parameters, associated with thermal ratcheting, could be acquired. It is found that the thermal ratcheting behavior exhibited by the employed materials, could be captured with a good accuracy. Given that the effect of thermal ratcheting on the long-time performance of polymers in targeted applications is a crucial issue, the research findings in the present work are encouraging for the design of appropriate materials, and the prediction of thermal ratcheting.

中文翻译：

工程聚合物的蠕变和热棘轮模型模拟

在目前的工作中，几种聚合物在特定温度和应力水平下的蠕变响应已通过粘弹性模型进行建模，并在之前的工作中进行了分析。特别是，在螺栓法兰连接中使用的聚合物在热循环下的实验蠕变结果被用作压力容器和管道的组件。分析的重点是聚合物法兰材料如高密度聚乙烯和三种垫片材料的实验结果，即聚四氟乙烯 PTFE（膨胀 e-和纯 v-）和可点击核酸。已经证明，通过在特定温度下的简单蠕变曲线上实施模型，可以评估模型参数。此后，通过实施热循环过程，另外两个与热棘轮相关的参数，可以被收购。发现所采用的材料表现出的热棘轮行为可以以良好的精度被捕获。鉴于热棘轮效应对聚合物在目标应用中的长期性能的影响是一个关键问题，目前工作中的研究结果对于设计合适的材料和预测热棘轮效应是令人鼓舞的。

更新日期：2021-09-08

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11