Pixel-wise full-field strain measurements for analysis of strain heterogeneities with regards to the material microstructure

A new optical-based pixel-wise full-field strain measurement method is proposed. This method allows for high spatial resolution quantification of strain heterogeneities. It is based on the production of a fine speckle pattern, the use of a large sensor camera with high magnification lens and a pixel-wise optical flow algorithm. The measured strain localizations are analyzed with regards to the microstructure of a ferritic-pearlitic steel.