Reliable accelerated testing routines involving tests at enhanced temperatures are of paramount importance in developing viscoelastic models for polymers. The theoretical basis, the time-temperature superposition (TTS) principle, is used to construct master curves and temperature-dependent shift factor, which is the necessary information to simulate the material response in arbitrary temperature and strain regimes. The Dynamic Mechanical and Thermal Analysis (DMTA) TTS mode, being one of the most promising approaches in terms of time efficiency and maturity of the software, is compared in this paper with macrotests at enhanced temperatures in their ability to give reliable master curves. It is shown, comparing simulations with test data for a chosen epoxy polymer, that none of the three DMTA TTS mode-based attempts used (at different temperature steps during frequency scanning) was successful in predicting the epoxy behavior in tests. On the contrary, using one-hour macrotests at enhanced temperatures gives a viscoelastic model with a very good predicting accuracy. Simulations were performed using an incremental formulation of the previously published VisCoR model for linear viscoelastic materials.

中文翻译：

---

热固性聚合物粘弹性本构模型中与温度相关的位移因子和主曲线

可靠的加速测试程序，包括在更高的温度下进行测试，对于开发聚合物粘弹性模型至关重要。理论基础，即时间-温度叠加 (TTS) 原理，用于构建主曲线和随温度变化的位移因子，这是在任意温度和应变状态下模拟材料响应的必要信息。动态机械和热分析 (DMTA) TTS 模式是在时间效率和软件成熟度方面最有前途的方法之一，本文将其与增强温度下的宏观测试在提供可靠主曲线的能力方面进行了比较。如图所示，将模拟与所选环氧聚合物的测试数据进行比较，所使用的三种基于 DMTA TTS 模式的尝试（在频率扫描期间的不同温度步骤下）都没有成功预测测试中的环氧树脂行为。相反，在增强的温度下使用一小时的宏观测试给出了具有非常好的预测精度的粘弹性模型。使用先前发布的用于线性粘弹性材料的 VisCoR 模型的增量公式进行模拟。