Digital image correlation analysis of ice fracture experiments
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Insinööritieteiden korkeakoulu | Master's thesis
Master's Programme in Mechanical Engineering (MEC)
AbstractDigital Image Correlation is now commonly used in the fields of solid and fracture mechanics to measure full-field displacements for both ductile and brittle materials. However, no detailed study of application of DIC on fracture test of freshwater ice is available in the literature. This thesis focuses on DIC analysis of fracture experiments, for S2 columnar freshwater ice, conducted at Aalto Ice Tank. DIC is used to find the crack path along with crack tip location using optimization approach based on singular field around the crack. Because of low signal to noise ratio of DIC displacement fields, kinematic displacement fields based on William's elasticity solution are also implemented to estimate the crack tip and find stress intensity factor for the extended crack length. The implemented methodology is capable of finding the fracture characteristics after the application of the peak load on the crack mouth of edge cracked rectangular plate for different specimen sizes at different loading rates. Improving the signal to noise ratio of the measured DIC displacement fields can reduce the uncertainties in the results.
Thesis advisorBossuyt, Sven
ice fracture, digital image correlation, crack, stress intensity factor, fracture process zone