复合材料脱粘缺陷的红外热像无损检测

摘要

以固体火箭发动机中的玻璃纤维复合材料壳体/绝热层试件的脱粘缺陷为研究对象,利用脉冲闪光灯热激励方式对试件进行加热,用红外热像仪实时监测试件的表面温度场,由表面温度差异来判定试件内部缺陷,然后通过对热像图进行图像增强处理和分割以定量识别缺陷.将实验结果与超声C扫描检测结果进行的对比分析表明:红外热像无损检测方法能够快速直观地发现深度5mm以内、直径10mm以上的脱粘缺陷,而超声C扫描检测更适合于对特定缺陷进行准确定量检测.%To estimate debond defects of glass fiber composite materials applied in the SRM(Solid Rocket Motor) , an active infrared thermography nondestructive testing system was set up. The specimen with known debond defects was stimulated by a pulsed heating source and the surface temperature of the specimen was monitored by the infrared camera. According to the differ-ence of the surface temperature, the defects inside the specimen could be detected. The experiment results were compared with the ultrasonic C-scan ones. The results show that the infrared thermography is a fast and effective inspection method for detecting debond defects with the diameter over 10 mm and depth within 5 mm.