Optical flow tracking of the intensity barycenter position in a frame sequence recorded during a tensile test to establish the XY-plane deformation map of a flat 3D printed sample

Bruno Serio; Jean-Jacques Hunsinger; Ye Zhi

doi:10.1117/12.2592438

20 June 2021 Optical flow tracking of the intensity barycenter position in a frame sequence recorded during a tensile test to establish the XY-plane deformation map of a flat 3D printed sample

Bruno Serio, Jean-Jacques Hunsinger, Ye Zhi

Author Affiliations +

Proceedings Volume 11782, Optical Measurement Systems for Industrial Inspection XII; 1178221 (2021) https://doi.org/10.1117/12.2592438
Event: SPIE Optical Metrology, 2021, Online Only

Conference Poster

Abstract

Additive manufacturing has deeply simplified the production of prototypes by speeding up the realization of complex 3- dimensional objects. A well-designed mechanical part requires perfect knowledge of internal stresses and mechanical behavior of the used material. In this study, we propose a new application for the optical-flow method in the field of extensometry. This method has already proven its capabilities for measuring the displacements and speeds of moving objects in video sequences for many motion tracking applications. The orientation of the fused filament deposited strands influences strongly the behavior of the FDM-manufactured part. In order to study the behavior of a mechanical part as a function of the arrangement of the deposited strands, we produced, using FDM, tensile test specimens by superposing several homogeneous layers. Each of the layers is characterized by a fixed strands orientation. These specimens are then tested on a tensile test machine. Due to the different arrangements of the strands according to the layers, the deformations on the surface of the sample can be complex. A conventional extensometer is then no longer usable. Accordingly, we propose to apply the optical flow method to a video of the test sample surface recorded during a tensile test. We present the experimental setup of the measurement method, the implemented algorithm based on a Mathematica optic flow builtin function and some illustration results. The results show that this technique can be used on real parts subjected to stress in order to reveal weakened areas.

Conference Presentation

Citation Download Citation

Bruno Serio, Jean-Jacques Hunsinger, and Ye Zhi "Optical flow tracking of the intensity barycenter position in a frame sequence recorded during a tensile test to establish the XY-plane deformation map of a flat 3D printed sample", Proc. SPIE 11782, Optical Measurement Systems for Industrial Inspection XII, 1178221 (20 June 2021); https://doi.org/10.1117/12.2592438

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