Digital Image Correlation (DIC) is a full-field measurement technique that generally relies on brightness conservation principles. This work aims to analyze cases in which the speckle pattern vanished after heating, thereby severely altering brightness. Sets of images acquired during 6 experiments were registered and then used obtain optimal sets reference for each time step via Principal Compo...

This work characterises crack growth in AA2024-T315 by combining different methods to further increase the reliability of results. The Christopher-James-Patterson (CJP) model was fitted experimental data obtained digital image correlation (DIC). effective value CJP stress intensity factors were successfully correlated with ?K-da/dN curve as Scanning Electron Microscopy measurements depth striat...

The measurement of deformations, displacements, strain fields and surface defects in many material tests in Civil Engineering is a very important issue. However, these measurements require complex and expensive equipment and the calibration process is difficult and time consuming. Image processing could be a major improvement, because a simple camera makes the data acquisition and the analysis ...

The intergranular cracking in the Mg-Gd-Y alloy was investigated by an situ tension test combined with electron backscattered diffraction (EBSD) measurement and digital image correlation (DIC). During test, crack found at triangle point of grain boundary area profuse slip traces. DIC results show that inhomogeneous strain distribution can be area, leads to serious deformation incompatibility th...

OBJECTIVE Analysis of mechanical measurements in laparoendoscopic single-site surgery (LESS) is important for instrument design and surgical simulators. The aim of this study was to develop a measuring system for different instruments and manipulations in LESS using a single-incision laparoscopic surgery (SILS) port. METHODS The loads on the SILS port were applied and recorded by the universa...

A new method is proposed to measure the finite element (FE) displacement field from a deformed image in comparison to a reference one. In opposition to standard FE approaches, the unknown displacement is sought as a sum of products of separated dimensions functions. The problems in each dimension being uncoupled, the method involves only 1D meshes and 1D problems. An algorithm that builds succe...

Previous studies introduced the digital image correlation (DIC) as a viable technique for measuring bone strain during loading. In this study, we investigated the sensitivity of a DIC system in determining surface strains in a mouse tibia while loaded in compression through the knee joint. Specifically, we examined the effect of speckle distribution, facet size and overlap, initial vertical ali...

An experimental investigation into the fracture properties of 160-lm-thick edge-cracked specimens of austenitic nickel–titanium (nitinol) under uniaxial tension is presented. Using the in situ optical technique of digital image correlation (DIC), strain fields directly relating to phase boundary nucleation and propagation of fracture samples were observed for the first time. The shape and size ...

Using the in situ optical technique known as digital image correlation (DIC), full-field quantitative strain maps of localization have been experimentally obtained for the first time in thin sheets of Nitinol. The use of DIC provides new information connecting previous observations on the microand macro-scales. It shows that the transformation initiates before the formation of localized bands, ...

As one of the most exciting inspection and powerful analysis methods in modern materials metallographic examinations, the difference interference contrast (DIC) method has many advantages, including relatively low requirement for specimen preparation, obvious relief senses observed under microscope. Details such as fine structures or defects that are not or barely visible in incident-light brig...