基于多指标控制的聚氨酯阻尼材料动态力学性能稳健性分析

Robustness analysis of dynamic properties of polyurethane damping materials based on multi-index control

  • 摘要: 强震或强风下,建筑结构中的隔震或消能装置受力大、变形大,这就要求阻尼材料的阻尼系数高,适用温度与室外环境匹配,具有大阻尼温域。目前,聚氨酯阻尼材料难以同时满足上述诸多指标性能,因而无法广泛应用于建筑结构减震领域。本文选择了玻璃纤维、石墨烯、四脚状氧化锌晶须及受阻酚小分子四种增强填料,以同时提高聚氨酯材料的阻尼性能、力学性能并改变其温度特性。通过正交试验设计了不同用量的聚氨酯复合阻尼材料,并进行基本物理力学性能和动态力学性能试验。根据动态热机械分析(DMA)试验结果,利用田口法进行损耗因子峰值tanδmax、大阻尼温域ΔT0.5和玻璃化转变温度Tg三个动态力学性能指标的信噪比分析和方差分析,以获得各指标的稳健性。依据各指标的重要性进行权重赋值,由层次分析法(AHP)构建多指标赋权评价方法,得到优化方案。并通过验证试验可知,优化后聚氨酯材料tanδmax为1.24,ΔT0.5为57℃,Tg为21.8℃,与初始组相比,其tanδmax提高了16.98%,ΔT0.5拓宽了46.91%。

     

    Abstract: The isolation devices and dampers in architectural structure have large force and deformation under strong earthquake or wind, which requires high damping coefficient of damping material, suitable temperature matching with outdoor environment, and large damping temperature range. Currently, polyurethane damping materials are difficult to satisfy the above-mentioned performance indexes simultaneously, therefore they can not be widely used in structure engineering. In this paper, glass fiber, graphene, tetra-needle like ZnO whiskers (T-ZnOw) and hindered phenol were selected to improve the damping, mechanical properties and temperature properties. Through orthogonal design, polyurethane with different additions were prepared. And the robustness of loss peak value (tanδmax), damping temperature range (ΔT0.5) and glass transition temperature (Tg) were analyzed based on the dynamic thermomechanical analysis (DMA) test. According to the degree of importance of each index, weight assignment was carried out. The optimization scheme was obtained based on analytic hierarchy process (AHP), which is a multi-index weighting evaluation method. The validation test shows that tanδmax is 1.24, ΔT0.5 is 57℃, and Tg is 21.8℃.Compared with the initial group, the improvement rate of tanδmax reaches 16.98 %, and the improvement rate of ΔT0.5 reaches 46.91 %.

     

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