摘要
针对固体火箭发动机多层黏接结构界面脱黏的检测难题,通过构建分层等效模型与传递矩阵相结合的频散方程,开展仿真分析与试验研究。根据Lamb波频散曲线和仿真检测回波信号选择合适的检测频率与入射角度,制作多层结构脱黏试件,使用斜入射水浸检测系统进行检测试验。根据频散曲线确定Ⅱ界面脱黏检测频率为2 MHz,Ⅲ界面脱黏检测频率为1 MHz。基于确定的检测频率和入射角度开展仿真计算,得出对Ⅱ界面黏接情况进行检测时,只需要关注第二波包;对Ⅲ界面黏接情况进行检测时,只需要关注第二波包。随后开展Ⅱ、Ⅲ界面脱黏试验,结果表明:选用2 MHz超声换能器、以11°入射角检测Ⅱ界面,选用1 MHz超声换能器、以10°入射角检测Ⅲ界面,可以检测出尺寸(边长)为50 mm×50 mm的脱黏缺陷。
Addressing the detection challenge of interface debonding in multilayer bonded structures of solid rocket motors,simulation analysis and experimental research were conducted by constructing dispersion equations combining layered equivalent models and transfer matrices.Based on Lamb wave dispersion curves and simulated detection echo signals,appropriate detection frequencies and incident angles were selected.Multilayer structure debonding specimens were fabricated,and testing was performed using an oblique incidence water immersion detection system.According to the dispersion curves,the detection frequency for interfaceⅡdebonding was determined to be 2 MHz,and for interfaceⅢdebonding,1 MHz.Simulation calculations based on the determined detection frequencies and incident angles showed that for detecting the bonding condition of interfaceⅡ,only the second wave packet needed to be focused on;for interfaceⅢ,only the second wave packet needed to be focused on.Subsequently,debonding tests for interfacesⅡandⅢwere conducted.The results showed that using a 2 MHz ultrasonic transducer at an 11°incident angle for interfaceⅡand a 1 MHz ultrasonic transducer at a 10°incident angle for interfaceⅢcould detect debonding defects with dimensions(side length)of 50 mm×50 mm.
作者
李续航
李剑
何小龙
王学仁
孙振生
LI Xuhang;LI Jian;HE Xiaolong;WANG Xueren;SUN Zhensheng(Zhi Jian laboratory,Rocket Force University of Engineering,Xi'an 710025,China)
出处
《无损检测》
2025年第12期27-34,共8页
Nondestructive Testing
基金
固体推进全国重点实验室基金项目(2024020401)。
