The Kolsky-Hopkinson Bar Machine by Ramzi Othman

Author:Ramzi Othman
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Digital image correlation (DIC) method is a widely used and useful optical method to measure deformation and strain field in experimental mechanics because of the advantages of non-contact, high accuracy, real time and full deformation field measurement. In the system, a digital camera and a computer were used to capture the movement of speckles in situ before and after a deformation. By comparing the speckle pattern in the objective configuration with the speckle pattern in the initial configuration, the displacement and strain full-field can be determined. The matching theory of this method is given in Fig. 4.4. Quadrangle S (solid line) is a reference (or undeformed) sub image and quadrangle S1 (dash line) is the corresponding deformed sub image. In order to obtain the displacements u m and v m of point M, sub image S1 is matched with sub image S using a correlation operation.

Fig. 4.4Schematic diagram of deformed process for planar object

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