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DIC-based experimental analysis of plate specimens with central holes loaded in tension

Digital Image Correlation (DIC) experimental method is receiving a significant attention recently both in research and industry since it enables full-field, non-contact optical measurements of deformations and strains on almost any material and any geometry [1, 2]. In this study, DIC measurement system was used for determination and analysis of the values of strains and stresses in plate specimens with central hole loaded elastically in tension using a tensile testing machine. In order to determine the applicability of the method and the sizes of geometrical discontinuities i.e., stress concentrators that can be successfully characterized with available equipment, plate specimens made of various materials and with central holes of different sizes were studied. An important step in preparation of the specimens, which can have significant influence on results, is creation of the appropriate random speckle pattern on the specimen’s surface which is usually done by spraying paint [3]. In this work, speckle pattern was applied using airbrush system and influence of speckle pattern on measurement results was considered. Values of strains and stresses on individual specimens were determined using basic empirical equations, numerically with the FEA software and compared with those determined experimentally using the DIC system. Results of the study are reported.

Digital Image Correlation (DIC) ; Plate with central hole ; Stress concentrator ; Experiment

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