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Date of Award
High-speed digital image correlation (DIC) is of current interest in full-filed measurement, since a high frame rate can help researchers to obtain enough images in the short period of the large and quick deformation stage to describe more details about the fracture process.
In this thesis, DIC applications in fracture strain measurement were studied in three parts: first, DIC’s capability in full-field strain measurement was introduced and demonstrated; second, the differences between 2-D and 3-D DIC measurement methods on in-plane deformation problems were analyzed and identified, and a small difference was found when DIC sensor plane is parallel to the specimen’s plane; at last, one set of DIC images from high-speed camera was used and split into different sets of frame rates to simulate and investigate the influence of different capturing frame rates, and the results led to the following conclusion: using high-speed DIC provides a way to see the crack initiation and its propagation, and capture the later stage of the fracture that reports a higher fracture strain than that at lower frame rate, satisfying the current research interest in finding material’s fracture-controlled forming limit.
Zhang, Huadian, "Fracture Strain Measurement With 2-D Dic At Various Frame Rates" (2017). Wayne State University Theses. 649.