【摘要】 为准确、便捷地在复合材料制件的实际生产中监测漏气、树脂液体流动及干斑缺陷，建立了基于介电传感器的复合材料液体成型树脂三维流前及干斑监测技术。将两张相同大小、相互平行的柔性金属箔及金属箔间的纤维复合材料组成平行板式电容传感器，根据树脂流动过程中传感器内部电介质的状态变化与金属箔间的厚度变化实现监测功能。通过人为制造不同程度的漏气情况，验证了传感器监测纤维承压情况与漏气的准确性；通过在纤维预成型体内不同位置设置电容传感器，利用真空辅助树脂灌注工艺使树脂在纤维预成型体内流动，其实际观测结果与传感器监测信号分析结果一致，证明了传感器具有监测树脂流动前沿与树脂流动速率的能力；在纤维布表面利用凡士林与纤维铺层固定剂制造干斑缺陷，基于树脂流动监测功能，验证了传感器识别干斑缺陷的可靠性。该技术为复合材料制件在实际生产中出现的漏气情况、树脂流动情况及成型缺陷等提供了有效在线监测手段。更多还原

【Abstract】 In order to accurately and conveniently monitor air leakage,resin liquid flow and dry spot defects in the actual production of composite parts,an in-situ monitoring technology for three-dimensional resin flow and dry spots based on dielectric sensors in liquid composite molding(LCM) was established. The parallel plate dielectric sensor was formed by two flexible metal foils of the same size and parallel to each other and the composites between the metal foils. The monitoring function was realized according to the state change of the dielectric inside the sensor and the thickness variation between metal foils during the resin infiltration process. The accuracy of the sensors in monitoring atmospheric pressure and air leakage was verified by creating artificial air leakage situations. The ability of the sensor to monitor the resin flow front and resin flow velocity was demonstrated by consistency of actual observations with monitoring signals according to set the sensor at different locations in the fiber preform during the vacuum assisted resin infusion process. The reliability of the sensor to identify dry spot defects was verified by creating dry spot defects through Vaseline and glue on the surface of fabric,based on the resin flow monitoring function. The technology provides effective an in-situ monitoring method for air leakage,resin flow and defects in composite molding process.更多还原