Review of calibration techniques for strain field measurement systems based on Digital Image Correlation method
This paper introduces the principle,application and development status of the strain field measurement system based on Digital Image Correlation(DIC),expounds the necessity of calibrating the system,and introduces the principles of representative calibration methods for DIC strain field measurement systems,such as four point bending calibration method,uniaxial tension calibration method,vertical loading calibration method and speckle transformation calibration method.The calibration dimension,calibration range,device cost,device complexity,metrological traceability and measurement uncertainty of various calibration methods are discussed,and the advantages and disadvantages of each calibration technology are compared and analyzed.It is pointed out that the accuracy of existing calibration methods can be improved by improving sensor performance,optimizing the measurement optical path,and enhancing the speckle quality.The development direction of calibration technology for strain field measurement systems based on DIC is discussed,and it is pointed out that future research should focus on the reliable generation and reproduction of large deformation fields,three-dimensional visualization of speckle patterns,and organic fusion of multiple calibration data to further broaden the scope of application of strain field calibration and effectively reduce the uncertainty in the measurement process.
Digital Image Correlationcalibrationstrain field measurementuncertainty
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