复合材料脱粘缺陷的红外热像无损检测

Infrared thermography nondestructive testing of debond defects in composite materials

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 difference 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.