热波散射和地下温度分布的分析,梯度建筑材料的缺陷
Xujiao Yang1, Jinlei Gai2, Xinliang Zheng3
1School of Civil Engineering and Transportation, Beihua University, Jilin, 132013, China.
Scientific reports
|July 2, 2025
概括
梯度建筑材料比传统选择提供更高的性能. 这项研究模拟了梯度材料中的热波传播,以分析地下缺陷,帮助设计先进的耐用结构.
科学领域:
- 材料科学与工程 材料科学与工程
- 热物理 热物理
- 非破坏性测试 不破坏性测试
背景情况:
- 传统建筑材料 (绝缘,防水,防火) 具有功能限制,如老化,寿命短,性能降低.
- 现代建筑要求提高能源效率,安全性和耐用性,需要先进的材料.
- 功能梯度材料 (FGMs) 整合结构和特性对于满足这些需求至关重要.
研究的目的:
- 建立基于对梯度材料的非里埃导热定律的热波传播模型.
- 在指数梯度材料中,通过地下圆形缺陷的热波散射得出分析解决方案.
- 研究材料特性和缺陷特征对表面温度分布的影响.
主要方法:
- 开发一种利用非里埃导热定律的热波传播模型.
- 波函数扩张方法和虚拟镜技术的应用.
- 集成与数值程序进行系统分析的参数,如热扩散长度,波数,不均系数,和缺陷嵌入比.
主要成果:
- 峰值温度振幅直接观察到地下散射器的前面.
- 随着热扩散长度的增加或缺陷大小的减少,热波动效应会加剧.
- 温度波动响应被高调制频率 (大波数) 和浅缺陷埋藏深度放大.
- 增加的材料不均性参数 (σ1a) 会导致更高的表面温度.
结论:
- 这项研究突出了富里埃定律在短脉冲导热中的局限性,验证了非富里埃方法.
- 这些发现为设计具有更好的热性能的功能梯度材料提供了理论基础.
- 结果为非破坏性检查技术提供数据支持,特别是红外热学,用于在FGM中检测缺陷.
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