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On the stochastic nature of thermomechanical properties in glass reinforced polyester laminates

机译：玻璃纤维增​​强聚酯层压板热机械性能的随机性

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摘要

The objective of this work is to study the statistical nature of effective thermal expansion coefficients (TECs) in glass reinforced polyester (GRP) laminates. To this end, thermomechanical properties and their stochastic behavior of hand lay-up composite laminates of various stacking sequences are defined by conducting a comprehensive experiment program. An adequate number of experiments is performed for two basic glass fabricvs and a representative combination thereof in a stacking sequence typical of what is used in manufacturing composite rotor blades of wind turbines. Components of the anisotropy tensor of TECs for the aforementioned materials are measured using an automated thermomechanical analyze (TMA) of DuPont. Two statistical distributions (normal, Weibull) were tested to model the variation of TECs and both of them proved to be a very good fit to the experiment results as revealed by Kolmogorov-Smirno (K-S) tests. An analytical metrology is also presented in this work for the prediction of the stochastic behavior of the laminate's effective TEC in terms of the distribution properties of building laminae. Comparison of the experimental cumulative distributions for the effective TEC and the theoretical ones proved the accuracy of the proposed approach.
机译：这项工作的目的是研究玻璃纤维增​​强聚酯（GRP）层压板中有效热膨胀系数（TEC）的统计性质。为此，通过进行全面的实验程序，确定了各种堆叠顺序的手糊复合层压板的热机械性能及其随机行为。对于两个基本玻璃织物及其代表性组合，以制造风力涡轮机复合转子叶片所用的典型堆叠顺序进行了足够数量的实验。使用杜邦的自动热机械分析（TMA）测量上述材料的TECs各向异性张量的分量。测试了两个统计分布（正态分布，Weibull分布）以模拟TEC的变化，并且如Kolmogorov-Smirno（K-S）测试所揭示的那样，它们都证明非常适合实验结果。在这项工作中还提供了一种分析计量学，用于预测层压板有效TEC的随机行为，即建筑薄片的分布特性。有效TEC和理论值的实验累积分布的比较证明了该方法的准确性。

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