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Crack sizing by laser excited thermography

机译：激光激发热成像技术确定裂纹尺寸

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摘要

Active thermography is a nowadays widely used NDT method making use of thermal material properties for defect detection. Basically, the sample is heated and the resulting surface temperature is recorded by an IR camera. For laser thermography a laser is used to heat the sample locally. The resulting spherical heat flow allows the detection of voids in arbitrary orientation. In this work, a method is presented which is suitable for the quantitative characterization of depth and angle of surface cracks. The main idea is to evaluate the crack-caused asymmetries of the laser's thermal footprint. The heat is introduced at fixed reference positions relative to the crack. In this paper a data analysis procedure is presented which allows the crack depth and angle to be described by only two characteristic scalar parameters. By investigating artificial test specimens with spark eroded notches, the feasibility of this method is validated. Furthermore, the behavior of the characteristic parameters with variations of crack angle, depth and experimental conditions is studied systematically by FEM simulations, showing that these parameters are well behaved.
机译：主动热成像技术是当今使用热材料特性进行缺陷检测的一种广泛使用的NDT方法。基本上，样品被加热，所得表面温度通过红外热像仪记录。对于激光热成像，使用激光局部加热样品。产生的球形热流允许检测任意方向的空隙。在这项工作中，提出了一种适合定量表征表面裂纹深度和角度的方法。主要思想是评估激光器的热足迹的裂纹引起的不对称性。在相对于裂纹的固定参考位置处引入热量。本文提出了一种数据分析程序，该程序允许仅通过两个特征标量参数来描述裂纹深度和角度。通过研究带有火花腐蚀凹口的人造试样，验证了该方法的可行性。此外，通过有限元模拟系统地研究了特征参数随裂纹角度，深度和实验条件变化的行为，表明这些参数表现良好。

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  • 来源
    《NDT & E international》 |2012年第1期|p.133-140|共8页
  • 作者

    J. Schlichting; Ch. Maierhofer; M. Kreutzbruck;

  • 作者单位

    BAM Federal Institute for Materials Research and Testing, Division VJ//.4 Acoustical and Electromagnetic Methods, 12000 Berlin, Germany;

    BAM Federal Institute for Materials Research and Testing, Division VJ//.4 Acoustical and Electromagnetic Methods, 12000 Berlin, Germany;

    BAM Federal Institute for Materials Research and Testing, Division VJ//.4 Acoustical and Electromagnetic Methods, 12000 Berlin, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    thermography; laser excitation; FEM modeling; crack sizing;

    机译：热成像激光激发有限元建模裂纹尺寸;

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