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NDT capability of digital shearography for different materials

机译：不同材料的数字剪切成像技术的无损检测能力

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摘要

In this paper, the capabilities of shearography for detecting hole and crack type defects in polymeric and metallic materials using thermal loading were investigated. In order to improve the ability of the identifying defect, the fringe multiplication technique was applied to some suspectable shearography fringe patterns. Based on the test results empirical rules for inspection plates of different material with specific thicknesses were established. For aluminium plates with thicknesses of 3 mm, minimum diameter of a surface breaking hole which is detectable is approximately equal to 2.5-3.0 times the depth of the defect, and for polymer plates with a thickness of 10 mm, the minimum detectable diameter is 0.8-1.3 times of the depth. For polymeric materials results from the increasing temperature period are approximately the same as those from the decreasing temperature period. When the orientation of the image shearing is not perpendicular to the longitudinal direction of the crack type defects, the sensitivity for defect detection is relatively higher than with perpendicular image shearing.
机译：在本文中，研究了使用热负荷的剪切成像技术检测聚合物和金属材料中的孔和裂纹类型缺陷的能力。为了提高识别缺陷的能力，将条纹乘法技术应用于一些可疑的剪切成像条纹图案。根据测试结果，建立了具有特定厚度的不同材料的检验板的经验规则。对于厚度为3 mm的铝板，可检测到的表面破洞的最小直径大约等于缺陷深度的2.5-3.0倍，对于厚度为10 mm的聚合物板，可检测到的最小直径为0.8深度的-1.3倍。对于聚合物材料，温度升高时期的结果与温度降低时期的结果大致相同。当图像剪切的方向不垂直于裂纹类型缺陷的纵向时，缺陷检测的灵敏度相对高于垂直图像剪切的灵敏度。

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  • 来源
    《Optics and Lasers in Engineering》 |2011年第12期|p.1462-1469|共8页
  • 作者

    Zhanwei Liu; Jianxin Gao; Huimin Xie; Philip Wallace;

  • 作者单位

    TWI Technology Centre (Wales) Ltd., ECM2, Margam, Port Talbot, SA13, 2EZ, UK,Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China;

    TWI Technology Centre (Wales) Ltd., ECM2, Margam, Port Talbot, SA13, 2EZ, UK;

    FML, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;

    TWI Technology Centre (Wales) Ltd., ECM2, Margam, Port Talbot, SA13, 2EZ, UK;

  • 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

    shearography; non-destructive testing; N DT capabilities;

    机译：剪切成像无损检测;N DT功能;

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