...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied Mathematical Modelling >3D heat diffusion simulation using 3D and 1D heat sources - Temperature and phase contrast results for defect detection using IRT
【24h】

3D heat diffusion simulation using 3D and 1D heat sources - Temperature and phase contrast results for defect detection using IRT

机译：使用3D和1D热源进行3D热扩散模拟-使用IRT进行缺陷检测的温度和相衬结果

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Infrared thermography (IRT) has proven to be a powerful non-destructive technique and it has been successfully used for detecting defects in a wide range of applications and sectors. Numerical modeling of heat transfer and diffusion in the presence of defects combined with experimental IRT results may be used both to detect and characterize existing defects with specific geometries and depths. However, the three-dimensional (3D) nature of defects combined with the need to simulate heat transfer and diffusion phenomena in transient regime often presents many challenges for researchers. The study presented in this paper is motivated by such difficulties and is intended to contribute to the interpretation of quantitative data results collected in experimental defect detection IRT tests and help with the definition of IRT experimental set-up parameters. In this study, 3D heat diffusion by conduction in the proximity of a 3D defect is modeled using a boundary element method (BEM) formulated in the frequency domain. The defect is a crack lodged in an unbounded solid medium with null thickness. In order to overcome difficulties that occur in the presence of null thickness elements, the BEM formulation was written in terms of normal-derivative integral equations (TBEM) and known analytical solutions were used to solve the resulting hypersingular integrals. The focus of this paper is to study the influence using either a 3D (point) energy source or a 1D (planar) energy source in heat diffusion simulations performed for IRT defect detection studies. Heat field and thermal wave phase results were computed in the presence of a defect and for when there is no defect present and a comparative analysis of the results obtained for a point and a planar source was carried out. In order to contribute to defects characterization studies, the influence of the crack's characteristics such as its size, shape and placement (depth and position) was analyzed using a phase contrast approach. Other features that may be relevant in IRT experiments, such as the nature of the stimulus provided and its distance from the surface were also studied. The major findings achieved from varying those parameters are presented in the conclusions.
机译：红外热成像（IRT）已被证明是一种强大的无损检测技术，已成功地用于检测各种应用和领域中的缺陷。在存在缺陷的情况下，对热传递和扩散进行的数值建模以及实验性IRT结果可用于检测和表征具有特定几何形状和深度的现有缺陷。但是，缺陷的三维（3D）性质以及在瞬态状态下模拟传热和扩散现象的需求通常给研究人员带来许多挑战。本文提出的研究正是出于这样的困难，旨在为解释在实验缺陷检测IRT测试中收集的定量数据结果做出贡献，并帮助定义IRT实验设置参数。在这项研究中，使用在频域中制定的边界元方法（BEM）对3D缺陷附近的传导引起的3D热扩散进行建模。缺陷是裂纹在无约束的固体介质中沉积，厚度为零。为了克服存在零厚度元素时出现的困难，BEM公式用正态导数积分方程（TBEM）编写，并使用已知的解析解求解所得的超奇异积分。本文的重点是研究在进行IRT缺陷检测研究的热扩散模拟中使用3D（点）能源或1D（平面）能源的影响。在存在缺陷的情况下和没有缺陷的情况下计算热场和热波相位的结果，并对点和平面源得到的结果进行比较分析。为了有助于缺陷表征研究，使用相衬方法分析了裂纹特征（如尺寸，形状和位置（深度和位置））的影响。还研究了IRT实验中可能涉及的其他特征，例如所提供刺激的性质及其与表面的距离。结论介绍了通过改变这些参数获得的主要发现。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号