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首页> 外文会议>IUTAM Symposium on Field Analyses for Determination of Material Parameters - Experimental and Numerical Aspects Jul 31-Aug 4, 2000 Kiruna, Sweden >OPTICAL METHOD TO STUDY MATERIAL BEHAVIOUR AT HIGH STRAIN RATES
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OPTICAL METHOD TO STUDY MATERIAL BEHAVIOUR AT HIGH STRAIN RATES

机译：研究高应变速率下材料行为的光学方法

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摘要

An optical technique to study material behaviour at high strain rates is presented. A small specimen is subjected to a rapid tensional loading in a Hopkinson bar type of arrangement where the loading is measured in the bar following the specimen. A high-speed camera of the image converter type is used to acquire time-resolved images during the loading. These images are evaluated using digital speckle photography to give the in-plane strain field. A calibration procedure is included that compensates for the aberrations in the camera. Experimental results on mild steel are further compared with a finite element calculation with the result that both strain fields show the same general behaviour, but some discrepancies appear that need to be further analysed in the future.
机译：提出了一种研究高应变速率下材料行为的光学技术。小样品以霍普金森棒型布置方式承受快速拉伸载荷，其中载荷是在样品后的棒中测量的。图像转换器类型的高速相机用于在加载过程中获取时间分辨图像。使用数字散斑摄影对这些图像进行评估，以得出面内应变场。包括校准程序，可补偿相机中的像差。将低碳钢的实验结果与有限元计算进行了进一步的比较，结果是两个应变场都表现出相同的一般行为，但是某些差异似乎需要在未来进行进一步分析。

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