温度梯度下钛合金热防护结构的导波特性研究  

Guided Wave Characteristics in Titanium Alloy Thermal Protection Structures under Temperature Gradient

作　　者：任元强 程冲 白丽丽 袁慎芳[1,2] REN Yuan-qiang;CHENG Chong;BAI Li-li;YUAN Shen-fang(State Key Lab of Mechanics and Control of Aerospace Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Research Center of Structural Health Monitoring and Prognosis,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;College of Aeronautics and Astronautics,Taiyuan University of Technology,Taiyuan 030002,China)

机构地区：[1]南京航空航天大学航空航天结构力学及控制国家重点实验室,南京210016 [2]南京航空航天大学结构健康监测与预测研究中心,南京210016 [3]太原理工大学航空航天学院,太原030002

出　　处：《装备环境工程》2023年第6期28-35,共8页Equipment Environmental Engineering

基　　金：国家自然科学基金创新群体项目(51921003);国家自然科学面上项目(52275153);国家自然科学基金青年基金项目(51905266);机械结构力学及控制国家重点实验室(南京航空航天大学)自主研究课题(MCMS-I-0521K01);江苏高校优势学科建设工程资助项目;南京航空航天大学前瞻布局科研专项资金。

摘　　要：目的实现可重复使用钛合金热防护结构的导波健康监测。方法针对钛合金热防护结构,提出热–力–电多物理场耦合导波传播建模仿真分析方法,研究温度梯度下钛合金热防护结构中导波的传播特性,以及在温度梯度和裂纹损伤耦合作用下导波的传播特性。结果20~500℃的温度梯度会导致钛合金结构中导波的群速度降低、幅值衰减降低,裂纹损伤使得钛合金结构中导波的群速度、幅值降低,且损伤越大,影响越明显。裂纹扩展至20 mm时,S0模式群速度降低了1.5%,A0模式群速度降低了2%。结论此模型可为大范围的温度梯度条件下,钛合金热防护结构上传感器优化布置以及导波监测方法的研究提供指导。The work aims to achieve guided wave health monitoring of reusable titanium alloy thermal protection structures.A thermal-force-electric multiple-physical field coupling simulation method for guided wave propagation in a thermal protection structure of titanium alloy was proposed.The propagation characteristics of guided waves in the titanium alloy thermal protec-tion structure under temperature gradient were investigated.The propagation characteristics of guided waves in the titanium al-loy thermal protection structure under the coupling effect of temperature gradient and crack damage were also investigated.The results showed that the temperature gradient from 20℃to 500℃could decrease group velocity and amplitude attenuation of guided waves in the titanium alloy structure,and the crack damage could decrease group velocity and amplitude of guided waves in the titanium alloy structure.The greater the damage,the more obvious the influence.When the crack propagated to 20 mm,the velocity of S0 mode group decreased by 1.5%and that of A0 mode group decreased by 2%.Therefore,this model can be used as a guide for optimization of sensor layout and guided wave monitoring on titanium alloy thermal protection structures under a wide range of temperature gradient conditions.

关 键 词：钛合金热防护结构 可重复使用航天器 温度梯度 热–力–电多物理场耦合建模 压电导波 结构健康监测 

分 类 号：V219[航空宇航科学与技术—航空宇航推进理论与工程]