Real-time measurement system for in-plane displacement and strain based on vision
2013
In this paper, combining optical measurement with conventional material testing machine, a real-time in-plane
displacement and strain measurement system is built, which is applied to the material testing machine. This system can
realize displacement and strain measurement of a large deformation sample moreover it can observe the sample crack on
line. The change of displacement field is obtained through the change of center coordinate of each point of a grid lattice
in the surface of the testing sample, according to two-dimensional sort coding for the grid in the traditional automated
grid method, in this paper, an improved one-dimensional code method is adopted which make calculating speed much
faster and the algorithm more adaptable. The measurement of the stability and precision of this system are made using
the calibration board whose position precision is about 1.5 micron. The results show that the short-time stability of this
system is about 0.5micron. At last, this system is used for strain measurement in a sample tension test, and the result
shows that the system can acquire in-plane displacement and strain measurement results accurately and real-time, the
velocity of image processing can reach 10 frame per second; or it can observe sample crack on line and storage the test
process, the max velocity of observation and storage is 100 frame per second.
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