Non-invasive technique for material testing

In order to enhance technological solutions for materials testing, Grupo Álava and GOM Metrology (Zeiss Group) close a strategic agreement. This agreement will strengthen the digital video image correlation solutions of the ARAMIS family for measuring displacement, deformation and stress. In addition, the ARGUS photogrammetry system suitable for forming analysis.

Digital video image correlation is a non-invasive and non-contact technique that allows to know the characteristics of a material or a complete element without interfering with its real conditions.

One of its main functionalities is that it does not limit the measurement field to the positioning point of a strain gauge, but to the area corresponding to the field of view of one or more digital cameras.

In this way, data are obtained from a partial surface of the object or even the entire object, avoiding unnecessary test repetitions and providing much more accurate results.

The forming results are then compared to the Formability Limit Curve (FLC). This is a data set of material parameters that describes the maximum formability by means of a Flow Formability Diagram (FLD). This diagram can be created directly in the GOM Correlate Pro software.

The result of the diagram will indicate whether the areas are overformed or still within a certain safety margin. Because of this, decisive information is obtained to optimize forming processes and validate simulations.

• From the optical point of view, the principle is simple. Using one or several cameras, consecutive images are obtained of the material subjected to some kind of excitation.
• The video correlation software compares a reference image with images captured during the test. Using advanced algorithms, the software shows the user object contours, displacements, stresses and even vibration frequencies.
• The system is compatible with cameras of various image capture speeds (from quasi-static to high-speed cameras). In addition, it is compatible with microscopic systems or thermal cameras, allowing it to be used with any object regardless of its size or test speed.

LET'S TALK? Leave us your details and we will send you a technical White Peper with the principles of Videocorrelation of Images.