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40 results on '"Strohmann, Tobias"'

1. A universal crack tip correction algorithm discovered by physical deep symbolic regression

Author

Melching, David, Paysan, Florian, Strohmann, Tobias, and Breitbarth, Eric

Subjects
Condensed Matter - Materials Science, Condensed Matter - Statistical Mechanics, Physics - Applied Physics
Abstract

Digital image correlation is a widely used technique in the field of experimental mechanics. In fracture mechanics, determining the precise location of the crack tip is crucial. In this paper, we introduce a universal crack tip detection algorithm based on displacement and strain fields obtained by digital image correlation. Iterative crack tip correction formulas are discovered by applying deep symbolic regression guided by physical unit constraints to a dataset of simulated cracks under mode I, II and mixed-mode conditions with variable T-stress. For the training dataset, we fit the Williams series expansion with super-singular terms to the simulated displacement fields at randomly chosen origins around the actual crack tip. We analyse the discovered formulas and apply the most promising one to digital image correlation data obtained from uniaxial and biaxial fatigue crack growth experiments of AA2024-T3 sheet material. Throughout the experiments, the crack tip positions are reliably detected leading to improved stability of the crack propagation curves.

Published
2024

6. Can unsupervised machine learning boost the on-site analysis of in situ synchrotron diffraction data?

Author

Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Universitat Politècnica de Catalunya. CIEFMA-PROCOMAME - Disseny Microestructural i Fabricació Avançada de Materials, Strohmann, Tobias, Barriobero Vila, Pere, Gussone, Joachim, Melching, David, Stark, Andreas, Schell, Norbert, Requena, Guillermo, Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Universitat Politècnica de Catalunya. CIEFMA-PROCOMAME - Disseny Microestructural i Fabricació Avançada de Materials, Strohmann, Tobias, Barriobero Vila, Pere, Gussone, Joachim, Melching, David, Stark, Andreas, Schell, Norbert, and Requena, Guillermo

Abstract

We explore the use of unsupervised machine learning to analyze in situ diffraction data of an additively manufactured Ti-6Al-4V alloy. The model is trained on a dataset consisting of four thermal cycles. The a/a’-ß phase transformation results in a steep gradient of the reconstruction error, whose derivative is applicable to detect periods of fast phase transformation. Moreover, the latent space features of the autoencoder correlate well with the volume fractions of a/a’ and ß. The methodology can be implemented to monitor phase transformation kinetics on-site during experiments at synchrotrons without the need of continuous training or manual data labeling., Peer Reviewed, Postprint (author's final draft)

Published
2023

8. Using AI for synchrotron data analysis

Author

Strohmann, Tobias, Bugelnig, Katrin, Gussone, Joachim, Barriobero Vila, Pere, Stark, A., Wilde, Fabian, Melching, David, Schell, Norbert, Villanova, Julie, Boller, Elodie, Bode, Felix, Wielenberg, Christoph, Breitbarth, Eric, and Requena, Guillermo

Subjects
Synchrotron Data, Artificial Intelligence
Published
2023

12. Fatigue crack growth experiments in the 2020th

Author

Strohmann, Tobias, Paysan, Florian, Melching, David, Dietrich, Eric, Requena, Guillermo, and Breitbarth, Eric

Subjects
Automation, Experimental Mechanics, Digitalization, Fatigue crack growth
Published
2022

23. Fast segmentation of 3D and 4D tomography using deep learning

Author

Strohmann, Tobias, Bugelnig, Katrin, Breitbarth, Eric, Mockenhaupt, Florian, Requena, Guillermo, Wilde, Fabian, Steffens, Thomas, Germann, Holger, and Boller, Elodie

Subjects
al-si alloy, neural network, synchrotron, deep learning
Published
2020

33. 4D microstructure evolution in Titanium Alloys for Additive Manufacturing

Author

Bugelnig, Katrin, Barriobero Vila, Pere, Breitbarth, Eric, Strohmann, Tobias, Gussone, Joachim, Silva, K., Villanova, Julie, Stark, Andreas, Schell, Norbert, Haubrich, Jan, and Requena, Guillermo

Subjects
4D microstructure evolution, in-situ synchrotron tomography, additive manufacturing, Ti alloys

34. Future laboratory for advanced mechanical testing

Author

Breitbarth, Eric, Paysan, Florian, Strohmann, Tobias, Melching, David, Dömling, Ferdinand, Schöne, Vanessa, Dietrich, Eric, Schultheis, Erik, and Requena, Guillermo

Subjects
robotics, machine learning, Mechanical testing, materials informatics

35. Synchrotron X-rays to engineer novel alloys for additive manufacturing

Author

Barriobero Vila, Pere, Bugelnig, Katrin, Silva-Reyes, Kenneth, Breitbarth, Eric, Strohmann, Tobias, Gussone, Joachim, Haubrich, Jan, Schell, Norbert, Stark, Andreas, Villanova, Julie, and Requena, Guillermo

Subjects
synchrotron-based characterization, Metal additive manufacturing

36. Time-resolved characterization of novel alloys for additive manufacturing

Author

Barriobero Vila, Pere, Gussone, Joachim, Bugelnig, Katrin, Breitbarth, Eric, Strohmann, Tobias, Silva-Reyes, Kenneth, Hecht, Ulrike, Sket, Federico, da Silva, Julio Cesar, Schell, Norbert, Stark, Andreas, Villanova, Julie, Haubrich, Jan, and Requena, Guillermo

Subjects
synchrotron-based characterization, Metal additive manufacturing

40. 4D microstructure evolution in a Titanium Alloy for Additive Manufacturing

Author

Bugelnig, Katrin, Barriobero Vila, Pere, Breitbarth, Eric, Strohmann, Tobias, Gussone, Joachim, Villanova, Julie, Stark, Andreas, Schell, Norbert, Silva, K., Haubrich, Jan, and Requena, Guillermo

Subjects
in-situ synchrotron tomography, microstructure evolution, Ti-La alloy, additive manufacturing

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