Transactions of Materials and Heat Treatment

Title：Research on strain measurement method of microscopic material based on stereo microscope

Authors： Zhang Mingkai Liang Jin Wu Guoqing Zhang Dongdong

Unit： Xi′an Jiaotong

KeyWords： stereo microscope microscopic material digital image correlation method microscope calibration

ClassificationCode：

year,vol(issue):pagenumber：2015,40(4):126-130

Abstract：

A novel full field three-dimensional strain measurement method to observe the microscopic material was proposed based on stereo microscope and digital image correlation technology. The problems existed in distortion process of calibrating stereo microscope by traditional calibration technology were illustrated, further, a new calibration method to calibrate microscope was proposed in order to obtain the higher measuring accuracy of three-dimensional displacement field and strain field. The strain measurement of hydraulic bulging test shows the measurement system of microscopic strain is of good feasibility when the full field strain of microscopic material surface is measured. At the same time, the result of finite element simulation agrees with the measurement result well, and the maximum principal strain deviation is less than 10%. It is indicated that the system is able to measure the strain of micro-sized material accurately.

Funds：

国家自然科学基金资助项目（51421004，51275378，51275389）；中央高校基本科研业务费专项资金资助

张铭凯（1992-），男，硕士研究生

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