摘要
热障涂层、吸波涂层等航空功能涂层缺陷、几何、结构、性能等表界面完整性参数的精准控制,对于兼顾、平衡其综合性能至关重要。提出航空功能涂层表界面完整性多参数的超声检测反演原理。原理基于超声波在涂层多界面结构中的作用机制,将模型正则化、数据正则化与灵敏度矩阵分析相结合,提出面向材料的特征检测信号正则化策略,并依据特征检测信号与表界面完整性多参数的相关性,发展了基于灵敏度矩阵(Sensitivity matrix,SM)的涂层表界面完整性多参数超声反演方法。以等离子体喷涂Al_(2)O_(3)涂层多个弹性常数的超声检测为例,阐述超声检测原理的实施效果。结果表明Al_(2)O_(3)涂层弹性常数C_(11)、C_(13)、C_(33)、C_(44)的反演结果分别为158.9 GPa、44.1 GPa、244.1 GPa、31.6 GPa,其中C_(44)的反演结果与试验结果之间相对误差不超过4.5%。所提出的超声检测反演原理为基于传统“试错法”超声检测难以解决的多参数复杂无损检测问题提供有效解决途径。
Accurate control of surface/interface integrity parameters included defect,geometry,structure,and property of thermal barrier coatings,absorbing coatings,and other aviation functional coatings is of great importance to balance their comprehensive performance.A new principle of ultrasonic detecting surface/interface integrity parameters of aviation functional coatings is presented.Based on the response mechanism of ultrasonic propagation in multi-interface coating structure,a material-oriented regularization strategy of characteristic detection signal is proposed,which includes model regularization,data regularization,and sensitivity matrix analysis.A sensitivity matrix based inversion method of ultrasonic detecting surface/interface integrity parameters is developed according to the correlation between characteristic detection signal and surface/interface integrity parameters.Taking the ultrasonic detection of elastic constants of plasma sprayed Al_(2)O_(3)coating as an example,the validity of proposed ultrasonic detection principle is illustrated.Resultsshow that the inversed elastic constants C_(11),C_(13),C_(33),and C_(44)of Al_(2)O_(3)coating are 158.9 GPa,44.1 GPa,244.1GPa,and 31.6 GPa,respectively,and the relative errors between them and the experimental results are less than 4.5%.The proposed ultrasonic inversion principle provides an effective path for solving the complex ultrasonic non-destructive detecting problems with multiple unknown parameters which are difficult for traditional“trial-and-error”ultrasonic detecting methods.
作者
林莉
马志远
孙珞茗
罗忠兵
雷明凯
LIN Li;MA Zhiyuan;SUN Luoming;LUO Zhongbing;LEI Mingkai(NDT&E Laboratory,Dalian University of Technology,Dalian 116024;School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2023年第8期1-8,共8页
Journal of Mechanical Engineering
基金
国家自然科学基金(52075078,51805072)
兴辽英才计划(XLYC1902082)
国家重点研发计划(2019YFA0708900)资助项目。
关键词
涂层
表界面完整性
超声检测
参数反演
灵敏度矩阵
coating
surface/interface integrity
ultrasonic detection
parameter inversion
sensitivity matrix
