锁定热图中的定量深度估计:侧面导热效应的建模和校正
Botao Ma1, Shupeng Sun1, Lin Zhang1
1Department of Engineering Mechanics, School of Civil Engineering, Shandong University, Jinan 250061, China.
Materials (Basel, Switzerland)
|November 27, 2025
概括
本研究量化了侧向导热如何影响合金中的缺陷深度估计,使用锁定式温度学. 一个新的校正模型显著提高了非破坏性测试应用的深度准确性.
科学领域:
- 材料科学 材料科学 材料科学
- 非破坏性测试 不破坏性测试
- 热传递是一种热传递.
背景情况:
- 锁定温度计对于检测地下缺陷至关重要.
- 准确的缺陷深度估计对于材料完整性评估至关重要.
- 侧向导热可以在深度测量中引入重大误差.
研究的目的:
- 为了研究侧向导热对合金的定量深度估计的影响.
- 为了比较盲频方法和相差方法的有效性.
- 制定一个纠正策略,以提高深度估计的准确性.
主要方法:
- 结合一维分析建模和三维有限元模拟.
- 对各种缺陷半径与深度的比率和激发频率进行了参数分析.
- 开发了一个指数校正模型来补偿横向导电效应.
主要成果:
- 盲频方法在小半径与深度比率 (0.5) 中显示了显著的低估 (高达20.7%).
- 开发的校正模型将盲频方法的误差降低到±5%.
- 阶段差方法的准确性取决于缺陷深度,频率和半径与扩散长度的比率,当比率超过3时,误差可以忽略不计.
结论:
- 侧向导热是定量热学深度反转中偏差的主要来源.
- 提出的指数校正模型有效地减轻了深度估计错误.
- 这项工作提高了工程应用的非破坏性测试的准确性.
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