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| Guided Wave Characteristics in Titanium Alloy Thermal Protection Structures under Temperature Gradient |
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| DOI：10.7643/issn.1672-9242.2023.06.004 |
| KeyWord:titanium alloy thermal protection structure reusable spacecraft temperature gradient thermal-force-electric multi-physical field coupling model piezoelectric guided wave structural health monitoring |
| Author | Institution |
| REN Yuan-qiang |
State Key Lab of Mechanics and Control of Aerospace Structures,Research Center of Structural Health Monitoring and Prognosis, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| CHENG Chong |
State Key Lab of Mechanics and Control of Aerospace Structures,Research Center of Structural Health Monitoring and Prognosis, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| BAI Li-li |
State Key Lab of Mechanics and Control of Aerospace Structures,Research Center of Structural Health Monitoring and Prognosis, Nanjing University of Aeronautics and Astronautics, Nanjing , China;College of Aeronautics and Astronautics, Taiyuan University of Technology, Taiyuan , China |
| YUAN Shen-fang |
State Key Lab of Mechanics and Control of Aerospace Structures,Research Center of Structural Health Monitoring and Prognosis, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| 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 protection structure under temperature gradient were investigated. The propagation characteristics of guided waves in the titanium alloy 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. |
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