复合材料发动机的相控阵超声粘接质量检测技术

PHASED ARRAY ULTRASONIC BONDING QUALITY INSPECTION TECHNOLOGY FOR COMPOSITE ENGINE

碳纤维复合材料具有高比强度和比模量,能满足航空航天系统对减轻结构质量的特殊要求,现已应用于航天运载和导弹武器领域。纤维缠绕的固体火箭发动机壳体由于粘接连接区域受力复杂,粘接结构不可靠时可能造成严重影响。本文采用相控阵超声检测技术进行脱粘检测研究,制作不同大小的脱粘缺陷进行检测实验,由于固体火箭发动机壳体与绝热层均为复合材料,材料内部的各向异性造成信号衰减较大,可利用变分模态分解方法对干扰信号进行降噪处理,并通过对回波信号进行延迟叠加得到脱粘缺陷信号,检测脱粘缺陷精度达到1 mm,检测结果表明相控阵超声对碳纤维复合材料发动机壳体脱粘检测具有可行性及准确性。

Carbon fiber composite material of high specific strength and specific modulus,aerospace systems to meet the special requirements of the quality of the relief structure,has been applied to the field of aerospace and missile weapons carrier.It has been used in the field of space transportation and missile weapons.The fiber-wound solid rocket motor shell may cause serious effects when the bonding structure is unreliable due to the complicated force in the bonding connection area.In this paper,phased array ultrasonic testing technology is used for debonding detection research,making different sizes of debonding defects for testing experiments,using variational modal decomposition method to reduce the noise generated by the water coupling interface,and through the echo signal De layed superposition is performed to obtain the debonding defect signal,and the detection accuracy is up to 1 mm.The test results show that the phased array ultrasound is feasible and accurate for the debonding detection of carbon fiber composite engine casing.