VisionLab complements the study of theory and computational modelling and extends it with experimental mechanics, which enables validation and calibration of computational models and serves to obtain material parameters. Experimental mechanics lies at the root of theory, and its study forms one of the pillars of the knowledge base of engineering mechanics students and graduates.
VisionLab contributes to the study of experimental mechanics by helping to master the application of optical systems and the digital image correlation (DIC) technique for strain measuring of diverse objects and structures made of various types of material, both of technical and biological origin. Students will be prepared to use theoretical knowledge for solving practical engineering problems applying the digital image correlation technique.
VisionLab offers the supervision of bachelor’s and master’s theses on diverse topics related to deformations measuring using optical systems and DIC. The diploma and bachelor thesis topics are inspired by the problems of contemporary engineering practice, which are dealt with by our industrial partners.
The thesis topic can be adjusted to the interests, preferences and professional orientation of individual students. We support a proactive approach and thesis topic suggestions submitted by students.
Strain measurement, i.e. displacements and deformations, under different loads represents a key area of experimental mechanics. The DIC technique has recently become increasingly popular compared to traditional measurement techniques, such as strain gauges, as it is a non-contact optical measuring method with high accuracy and low requirements for equipment and sample preparation.
Displacements, as a primary variable, are determined by comparing the changes in the image of the surface of the tested object before and after deformation. For the DIC algorithm to function correctly, the scanned surface needs to have a non-repeating, isotropic, high-contrast pattern – the so-called “speckle pattern”, thanks to which each monitored point has its unique surroundings and is therefore precisely defined. In some cases, the natural pattern on the surface of the specimen is sufficient. It is then possible to calculate the deformation field from the obtained displacements.
DIC is a valuable method for analysing local deformation phenomena, such as the formation of necking during tensile testing of cylindrical specimens or the initiation and propagation of cracks, which are difficult to measure using conventional extensometers or strain gauges. This method also allows to effectively investigate the stress-strain response of a system at elevated temperatures. Additionally, it helps to assess the causes of failure of measured components and complex systems.