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Development of Measuring System for Thermal Deformation of Heatproof Materials by Using Laser Speckle Interferometry at High Temperature

激光散斑干涉高温耐热材料热变形测量系统的研制

基本信息

批准号：
09555303
负责人：
MUROZONO Masahiko
金额：
$ 7.36万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

When the materials will be used at a high temperature atmosphere, the properties of the material must be matched with high temperature conditions. However, it is very difficult to measure the thermal strain in structures with existing methods, because the instrument used for strain measurement is in itself influenced by temperature. Electronic speckle pattern interferometry (ESPI) is a very useful method for measuring in-plane surface displacement. Using the cw-laser and the image processing system, it is possible to measure the displacement and strain : Unlike the traditional method for strain measurement such as the strain gauge or the moire method, the ESPI method requires no special surface preparation or the attachments and can measure the in-plane displacement with no contact and in real time. In this study, we discussed the use of ESPI for the measurement of the strain or the thermal strain of the objects at high temperature. And several methods to calculate the strain value from the interference fringe pattern were also discussed. In the experiments, the specimen was loaded in parallel with a load cell which provided the loading step. The specimen was a flat plate or a plate with a 12mm-diameter hole in its center. Strain gauges were attached to the specimen both in parallel and in normal directions to the loading direction. This study provides an example of how ESPI has been used to measure the two- dimensional displacement and strain distribution in the specimen. The results measured by using the ESPI were comparable with the data which were obtained by the strain-gauge method in tensile testing.

当材料要在高温环境中使用时，材料的性能必须与高温条件相匹配。然而，由于应变测量仪器本身受温度的影响，用现有的方法测量结构的热应变是非常困难的。电子散斑干涉法(ESPI)是测量面内位移的一种非常有用的方法。利用连续激光和图像处理系统，可以测量位移和应变：与应变片或云纹法等传统应变测量方法不同，ESPI方法不需要特殊的表面处理或附件，可以非接触地实时测量面内位移。在本研究中，我们讨论了利用电子散斑干涉技术来测量物体在高温下的应变或热应变。并讨论了由干涉条纹图计算应变值的几种方法。在实验中，试件与提供加载步骤的称重元件并行加载。标本为平板或中心有12 mm直径孔的平板。应变计与试件平行和垂直于加载方向连接。这项研究提供了一个例子，说明如何使用电子散斑干涉来测量试件中的二维位移和应变分布。用电子散斑干涉法测得的结果与用应变片法测得的拉伸数据具有可比性。