Contact person
Mathias Flansbjer
Forskare
Contact Mathias
Digital Image Correlation measurement in mechanical testing
Deformation measurement of materials and structures subjected to various loading is a fundamental task of experimental mechanics. Optical full-field deformation measurements based on DIC and DVC open new possibilities for engineers and scientists to better understand mechanical behaviour as deformations and strains of an object can be visualized.
DIC (Digital Image Correlation) is an image analysis method that offers 3D measurements of shapes, displacement fields and strain fields of a solid test object. Because DIC is a non-contact technique that is independent of the material being tested or the length-scale of interest, it has a great flexibility and can be used in a wide variety of applications to investigate materials and components, for static as well as dynamic situations. The DIC measurement technique provides a means of enhanced analyses and is therefore a valuable tool in the fields of material characterization, product development, method development and for calibration and validation of Finite Element (FE) calculations. Some common materials that are tested include metals, polymers, concrete, rock, wood and rubber. DIC measurements can be used to identify strain localizations, crack initiation and propagations in a loaded component.
DVC (Digital Volume Correlation) can essentially be considered as a volumetric extension of DIC, which enables measurements of deformations within the volume of a test object. The technique uses digital image volumes generated by, for example, X-ray Computed Tomography scanning of samples before and after loading or during in-situ tests. Full volumetric 3D measurements of displacement and strain fields are achieved from the DVC analysis. The technique offers fantastic possibilities for detailed studies of deformations and damage mechanisms occurring within the test object, in relation to the internal microstructure of the material. For instance, it is possible to relate the development of strain localizations to different phases in metals.
RISE has a long experience of optical deformation measurement based on DIC and DVC within many different application areas in both commission work and research. With our broad expertise in mechanical testing of materials and structures, we can offer customized experiments from small scale with microscope or X-ray micro-tomography, to large scale application with field of views of several meters. The measurements can be performed for slow events as well as fast events using high-speed cameras (high-speed DIC). We can offer guidance, experimental design, experimental realization, data evaluation and documentation to ensure high quality results that give answers to your questions.
Feel free to contact us if you are interested in mechanical testing with DIC and DVC measurements.
