Abstract
A modulus of elasticity was determined for eight differently foamed cement paste samples. Samples were loaded in the laboratory by a hydraulic press. The force acting on the sample was read directly from the laboratory press. Digital Image Correlation (DIC) analysis were used to draw deformations. Before loading pressure test was applied a random contrast pattern to the samples. Samples were captured by the camera in a one-second interval during the loading pressure test. The images were edited in the Adobe Photoshop Lightroom and then evaluated using Ncorr software. The result is a vertical and horizontal shift field. On the basis of the results obtained, it was possible to calculate the modulus of elasticity of each sample.
Highlights
There are many different methods to detect deformation of the sample during the loading pressure test
Static modulus of elasticity obtained on the basis of Digital Image Correlation (DIC) analysis, static modulus of elasticity obtained on the basis of the displacement of the hydraulic press and the dynamic elastic modulus obtained by the ultrasonic and resonance method were compared
The photos were edited in Adobe Lightroom for higher contrast, and the DIC analysis was performed in Ncorr version 1.2.1
Summary
There are many different methods to detect deformation of the sample during the loading pressure test. The displacement of the crosspiece of the hydraulic press does not correspond to the deformation of the sample in the direction of the force. DIC analysis is used in many industries, by many companies, including Airbus, AWE, Stresscraft and British Energy It is used, for example, for measuring the heat dissipation and curvature of electronic components, for measuring the 3D shape of the air bags, for monitoring the components of the power plants to determine their status and to reduce their emissions, or for the behavior of building materials during the loading tests [2]. The lenses are constructed at certain distances where the distortion occurs least For this reason, it is necessary to select a suitable lens and capture distance according to the size of the subject to be sensed [3, 4]
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