RT Journal Article
SR Electronic
A1 Majko, Jaroslav
A1 Piroh, Ondrej
A1 Minárik, Ján
A1 Vaško, Milan
A1 Handrik, Marián
A1 Sága, Milan
A1 Saternus, Zbigniew
T1 Strain Field Determination for Additively Manufactured Thermoplastics Using Computer Vision
JF Manufacturing Technology Journal
YR 2025
VO 25
IS 4
SP 511
OP 520
DO 10.21062/mft.2025.060
UL https://journalmt.com/artkey/mft-202504-0015.php
AB The effective application of additively manufactured materials requires accurate identification of their mechanical properties as well as damage mechanisms. Computer vision offers a novel approach for non-contact measurements, enabling the identification of selected mechanical properties. This paper presents a new method based on image analysis and the detection of circular markers for non-contact displacement measurements. The core principle involves detecting the centers of gravity of the circular markers formed on the sample under investigation. The centers of gravity are evaluated on each image created during the tensile test, representing nodal points. At these points, displacements are determined based on the non-contact extensometer. The deformations sought are a function of the displacements at each nodal point. These values were calculated based on several theoretical models, also used in the finite element analysis. The paper describes the computational procedure for determining the deformations based on the mentioned theoretical models. Subsequently, the total strain field is determined using linear interpolation of the displacement values at the individual nodal points. The results provided by each of the theoretical models were compared.