Development of microscopic thermography for small defects

小缺陷显微热成像技术的发展

• 批准号: 02555019
• 负责人: OGURA Keiji
• 金额: $ 8.26万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555019/
• 关键词: Non-destructivie inspection; Microscopic thermography; Infrared thermal image; Small flaws; Composite materials; Laminated film; Infrared transparent solid; Solid contact cooling; 赤外線サーモビジョン顕微鏡; 赤外線透過材料; 接触冷却; 転写温度場計測; 微小剥離欠陥; CFRP GFRP; 接合材

A thermographic non-destructive inspection system, which is applicable for the examination of the small defects and damage embedded in composite and laminated materials, has been developed. The infrared thermal image of the surface of test samples is taken and analysed, when the samples are heated and cooled. A conventional scanning-type thermal imager was used to obtain the thermal image with some optional magnification lens including microscope lens. The resolution in defect size was examined both experimentally and numerically by using artificial delaminated samples. It was found that the thermal conductivity of the sample plays an important role for the resolution. The use of an efficient cooling is a key for the improvement of the resolution. A minimum delaminated flaw size in the sub-surface of GFRP and CFRP samples was around 4mm in diameter under air cooling. A smaller flaw as large as 1mm in diameter was able to detect for a copper-polyimide laminated flexible film whose thickness is exceptionaly thin (60 microns in thickness). A new and more effective cooling technique, in which an infrared transparent solid plate is in contact on the heated test sample, has been developed. The thermal image of the sample surface is obtained through the transparent plate as soon as the plate is in contact on the sample in this method. The successful flaw inspection was demonstrated both in GFRP and CFRP samples.

研制了一种适用于复合材料和层合材料内部微小缺陷和损伤检测的热像无损检测系统。对试样加热和冷却过程中的表面红外热像进行了拍摄和分析。传统的扫描型热成像仪被用来获得热图像与一些可选的放大透镜，包括显微镜透镜。通过实验和数值模拟，使用人工分层样品的缺陷尺寸的分辨率进行了研究。结果发现，样品的热导率起着重要的作用的分辨率。使用有效的冷却是提高分辨率的关键。在空冷条件下，GFRP和CFRP试件表面下的最小分层裂纹尺寸约为4 mm。对于厚度非常薄（厚度为60微米）的铜-聚酰亚胺层压柔性膜，能够检测到直径为1 mm的较小缺陷。本文提出了一种新的、更有效的冷却技术，即在被加热的试样上放置一个透红外固体板。在该方法中，当透明板与样品接触时，通过透明板获得样品表面的热图像。在GFRP和CFRP样品中成功地进行了缺陷检测。

项目成果

小倉 敬二,阪上 隆英,岡部 俊一: "有限要素逆問題解析による材料内熱物性値分布の同定" 第42回応用力学連合講演会講演予稿集. 485-486 (1993)

Keiji Ogura、Takahide Sakagami、Shunichi Okabe：“通过有限元反问题分析识别材料中的热物理性质分布”第 42 届应用力学联盟会议记录 485-486 (1993)。

阪上 隆英,小倉 敬二: "赤外線サ-モグラフィによる非定常温度場計測とき裂状欠陥の非破壊検出" 日本機械学会講演論文集. 900ー50. 19-24 (1990)

Takahide Sakagami、Keiji Ogura：“使用红外热成像技术测量非稳态温度场和裂纹缺陷”，日本机械工程师学会会议记录 900-50 (1990)。

Takahide SAKAGAMI,Keiji OGURA: "A New Technique for the Damage Inspection of CFRP Using Thermal Imaging" Proc.of the 9th International Conference on Experimantal Mechanics. 526-535 (1990)

Takahide SAKAGAMI、Keiji OGURA：“利用热成像对 CFRP 进行损伤检测的新技术”第九届国际实验力学会议论文集。

Keiji OGURA, Takahide SAKAGAMI, Yukitaka TAGA, Shuusuke YAMANAKA: "A New Flaw Inspection Technique for Composites and Bonded Materials Using Infrared Thermovision" Proc. of 6th Symposium on Fracture and Fracture Mechanics. 1-5 (1991)

Keiji OGURA、Takahide SAKAGAMI、Yukitaka TAGA、Shuusuke YAMANAKA：“使用红外热视觉的复合材料和粘合材料的新缺陷检测技术”Proc。

Keiji OGURA, Takahide SAKAGAMI: "A New Inspection Technique for Small Flaws and Defects Using Infrared Thermography" Proc. of ASME-JSME Joint Conference on Electronic Packaging. 909-915 (1992)

Keiji OGURA、Takahide SAKAGAMI：“使用红外热成像技术检测小缺陷和缺陷的新技术”Proc。