中间层碳纤维方向的微波无损检测实验研究

发布时间：2018-05-02 09:17

本文选题：微波无损检测 + 复合材料　；参考：《功能材料》2017年05期

【摘要】：在研究多层媒介中的微波信号传播与反射机理的基础上,利用微波网络分析仪对3层复合材料中间层的纤维方向进行了检测研究。首先,根据N5225A网络分析仪记录的反射系数相位计算出反射系数相位差;然后,建立反射系数相位差与表示中间层纤维方向的β建立对应关系;最后,利用反射系数相位差表征纤维方向的变化。实验结果表明,矩形波导相对于复合材料纤维方向的角度(α)会对检测结果有一定的影响,反射系数相位差随工作频率的变化规律不同,并且对中间层的纤维方向的变化敏感范围也不同,波导口长边平行于第一层的纤维时,即α为0°时,对β为15~45°较敏感,波导口长边垂直于第一层的纤维时,即α为90°时,对β为45~75°较敏感;复合材料末端加一反射板可以增强检测效果,检测工作频率为33GHz,中间层纤维方向变化30°时,有反射板的反射系数相位差变化10°,而没有反射板的变化5°。
[Abstract]:On the basis of studying the mechanism of microwave signal propagation and reflection in multilayer media, the fiber direction of the interlayer of three layers of composite materials was detected by microwave network analyzer. First, the phase difference of reflection coefficient is calculated according to the reflection coefficient phase recorded by N5225A network analyzer; then, the corresponding relation between reflection coefficient phase difference and 尾 representing the direction of intermediate fiber is established. The change of fiber direction is characterized by phase difference of reflection coefficient. The experimental results show that the angle (伪) of the rectangular waveguide relative to the direction of the composite fiber has a certain effect on the detection results, and the phase difference of the reflection coefficient varies with the working frequency. The sensitivity range of the fiber direction of the intermediate layer is also different. When the long edge of the waveguide is parallel to the fiber of the first layer, that is, 伪 is 0 掳, it is more sensitive to the 尾 of 15 掳45 掳, and the long edge of the waveguide is perpendicular to the fiber of the first layer, that is, 伪 is 90 掳. When the detection frequency is 33 GHz and the fiber direction of the intermediate layer changes 30 掳, the reflection coefficient phase difference of the reflective plate changes 10 掳, but the change of the reflecting plate is 5 掳.
【作者单位】：济南大学机械工程学院;
【基金】：国家自然科学基金资助项目(51405192) 济南大学博士基金资助项目(XBS1411);济南大学科研基金资助项目(XKY1311)
【分类号】：TB302.5;TQ342.742

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