增强疲劳裂检测在复杂的结构与大切割使用非线性羊羔波浪的复杂结构.
Suofeng Zhang1, Yuan Liu1, Shenfang Yuan1
1Research Center of Structural Health Monitoring and Prognosis, State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Sensors (Basel, Switzerland)
|November 9, 2024
概括
这项研究引入了一种先进的方法,用于使用非线性Lamb波来检测飞机机翼结构中的疲劳裂. 该技术有效地提高了裂检测,即使在具有大切口的复杂设计中也是如此.
科学领域:
- 航空航天工程 航空航天工程
- 材料科学 材料科学 材料科学
- 非破坏性测试是指非破坏性测试.
背景情况:
- 飞机机翼底皮结构中的疲劳裂带来了重大安全风险和维护挑战.
- 非线性兰姆波技术为微裂纹监测提供了潜力,但面临着弱非线性组件和来自大型切断的复杂边界条件的局限性.
研究的目的:
- 开发和验证一个集成的数据处理方法,用于在大型切断结构中增强疲劳裂检测.
- 提高复杂的航空航天组件中非线性Lamb波监测的灵敏度和可靠性.
主要方法:
- 一种集成的数据处理方法,结合相位逆转和连续波波变换 (CWT).
- 使用相位速度脱同步来减轻材料非线性效应.
- 在合金板上进行了实验验证,该板具有很大的剪切和厚度变化.
主要成果:
- 提出的方法在检测复杂结构中的疲劳裂方面表现出有效性.
- 非线性元件被证明比线性元件更有利于监测封闭的裂.
- 综合方法成功增强了裂检测能力.
结论:
- 开发的综合数据处理方法对于在大型切断结构中的疲劳裂检测是有效的.
- 非线性Lamb波组件显示出对监控封闭裂的前景,性能优于线性组件.
- 这项研究有助于改善结构完整性的监测和降低航空航天应用中的维护成本.
相关概念视频
01:21Fatigue
174
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
174
01:20Microcracking in Concrete
103
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
103