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Cover Hartmann
Christoph Hartmann

Spatio-Temporal Optical Flow Methods for Process Analysis

Robust Strain, Strain Rate, and Crack Propagation Measurement in Shear Cutting
Details
Editorial Program: TUM.UP-THESES
Subject: Maschinenwesen
Language: Englisch
ISSN (print): 2364-6942
ISSN (electronic): 2569-4928
ISBN: 9783958840669
DOI: 10.14459/2021md1555274
Publication date: September 2021
1. Auflage
Description: 205 pages
Format: DIN A5
Price (print): 35,00 €
Volltext
Order print copy: Hugendubel, Lehmanns
About this book

 

Block matching algorithms (DIC), used in experimental mechanics and full-field process analysis, reach their limits in resolving complex, discontinuous, and multi-scale deformation patterns, are error-prone under industrial operating conditions, or fail when calculating spatio-temporal derivatives. However, motion and its spatio-temporal derivatives lay the foundation of modeling physical processes. This thesis pursues a fundamentally different approach, based on the calculus of variations – the optical flow methods. Newly designed regularizations together with a novel framework for hyperparameter determination enable robust estimation of motion, its spatio-temporal derivatives, and discontinuities. The proposed methods allow analyzing strain, strain rate, and crack propagation during different shear cutting processes using high-speed imaging on a developed precision shear cutting tool.

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