2022/03/25 by Khalid El-Awady, El-Awady, Khalid
Computer Science · Engineering · #Computer Vision and Pattern Recognition (cs.CV) #FOS: Computer and information sciences #Graphics (cs.GR) #Optical measurement and interference techniques #Structural Health Monitoring Techniques #Thermography and Photoacoustic Techniques
paper · pdf · doi:10.48550/arxiv.2203.13438
openalex publication_date 2022/03/25 · openalex created_date 2022/04/03 · openalex updated_date 2026/07/28
We reconstruct a 3D model of the surface of a material undergoing fatigue testing and experiencing cracking. Specifically we reconstruct the surface depth (out of plane intrusions and extrusions) and lateral (in-plane) motion from multiple views of the sample at the end of the experiment, combined with a reverse optical flow propagation backwards in time that utilizes interim single view images. These measurements can be mapped to a material strain tensor which helps to understand material life and predict failure. This approach offers an alternative to the commonly used Digital Image Correlation (DIC) technique which relies on tracking a speckle pattern applied to the material surface. DIC only produces in-plane (2D) measurements whereas our approach is 3D and non-invasive (requires no pattern being applied to the material).