Research Data Repository of Saxon Universities
OPARA is the Open Access Repository and Archive for Research Data of Saxon Universities.
Researchers of Saxon Universities can either publish their research data on OPARA, or archive it here to comply with requirements of funding acencies and good scientic practice, without public access.
You can find the documentation of this service at the ZIH Data Compendium websites. If you need suppourt using OPARA please contact the Servicedesk of TU Dresden.
Please note: The OPARA service was recently upgraded to a new technical platform (this site). Previously stored data will not be available here immediately. It can be found at the still active old version of OPARA. These stock data will be migrated in near future and then the old version of OPARA will finally be shut down. Existing DOIs for data publications remain valid.
Communities in OPARA
Select a community to browse its collections.
Recent Submissions
GRK 2802: Recycled magnesia particles in steel-based composites: Impact on thermo-mechanical behaviour
(Technische Universität Bergakademie Freiberg, 2026-02-02) Müller, Moritz; Mehdizadehlima, Mahnaz; Yaroshevskyi, Serhii; Aneziris, Christos G.; Biermann, Horst; Weidner, Anja
This study investigates the thermo-mechanical behaviour of steel-ceramic composites based on a matrix of austenitic stainless steel and coarse-grained magnesia particles. Composites reinforced with fresh-fused magnesia particles were compared to those reinforced with recycled magnesia sourced from spent MgO-C refractory lining bricks. The volume fraction of recycled magnesia varied from 20 vol% to 40 vol%. Quasi-static compression tests were performed at room temperature and within a temperature range of 800 ◦C–1100 ◦C. Results showed that incorporating coarse-grained ceramic reinforcements into the steel matrix increased the compressive strength at all temperatures. The composite reinforced with recycled magnesia demonstrated superior mechanical properties over the variant with fresh-fused magnesia due to a smaller and more uniform particle size distribution resulting from crushing steps in the recycling process. Although non-metallic inclusions from contaminated zones of the refractory bricks were present in the recycled powder, they did not affect the overall damage mechanisms.
GRK 2802: Influence of MgO-C recyclate on the thermo-mechanical compression behavior of commercial MgO-C refractory bricks
(Technische Universität Bergakademie Freiberg, 2026-02-02) Schramm, Alexander; Hubálková, Jana; Roungos, Vasileios; Schemmel, Thomas; Aneziris, Christos G.; Weidner, Anja; Biermann, Horst
In the present study, various thermo-mechanical tests under compressive load were performed on commercial MgO-C refractory brick grades over a wide temperature range up to 1600 °C in an argon atmosphere. The focus of the present study was the assessment of the influence of the incorporation of MgO-C recyclate on the thermo-mechanical behavior. Therefore, one MgO-C brick grade contained only fresh raw materials, while the other grade included MgO-C recyclate with a high mass fraction of 47.5 wt.%. Subsequent investigations, including scanning electron microscopy and porosity analyses, provided insights into the mechanisms occurring within the material during the thermo-mechanical tests. The incorporation of MgO-C recyclate led to an improvement in the thermo-mechanical properties, as increased compressive strength values were observed within the tested temperature range, along with enhanced creep resistance and improved behavior in the refractoriness under load tests.
GRK 2802: Four-Point Bending Tests at High Temperatures on Commercial MgO-C Refractory Bricks with and Without Recyclate Considering Different Carbon Contents
(Technische Universität Bergakademie Freiberg, 2026-02-02) Schramm, Alexander; Knöchel, Lukas; Schemmel, Thomas; Aneziris, Christos G.; Weidner, Anja; Biermann, Horst
Given the growing emphasis on refractory recycling, the performance characteristics of commercial MgO-C bricks incorporating MgO-C recyclates are of considerable economic and environmental relevance. In the present study, four-point bending tests are conducted in an argon atmosphere on three commercial MgO-C brick grades over a temperature range from room temperature to 1300 °C. One MgO-C brick grade is produced exclusively from virgin raw materials, whereas the other two grades incorporate MgO-C recyclate at a high mass fraction of 47.5 wt.%. Due to the different sources of the recyclates, their carbon contents vary, resulting in different total carbon contents in the two MgO-C brick grades containing recyclate. Post-mortem SEM investigations show predominantly transgranular fracture through the MgO-C recyclates. The evaluation of the four-point bending tests reveals no detrimental effect of the MgO-C recyclates on bending strength. Instead, a decisive influence of the total carbon content is observed, with lower total carbon contents correlating with higher bending strength values. Furthermore, the heterogeneous structure of the MgO-C recyclates contributes to enhanced stress dissipation caused by anelastic deformation processes in the respective MgO-C brick grades, despite the accompanying decrease in virgin flake graphite content.
Photogrammetric data of circular target test fields for eccentricity analysis
(Technische Universität Dresden, 2026-01-30) Liebold, Frank
This data publication contains photogrammetric data of test fields of circles.
Please download the zip files and extract them. There are three experiments:
Experiment 1 (in "exp1_planar_test_field.zip"): A planar test field with 20 concentric circle targets. The 12 larger circles have inner radii of 15mm, outer radii of 30mm and a grid size of 67mm. There are 8 further smaller circles (inner radius: 3mm, outer radius: 6mm).
A bundle of 12 images (see "image_orientations.png" in "images_planar_test_field.zip") was recorded.
Experiment 2 (in "exp2_nonplanar_test_field.zip"): A nonplanar test field with 60 concentric circle targets with inner radii of 13mm and outer radii of 26mm. A bundle of 12 images (see "image_orientations.png" in "images_nonplanar_test_field.zip") was recorded.
Experiment 3 (in "exp3_scale_bar_comparison.zip"): There three subexperiments with different circular target radii (5mm, 7.5mm, 10mm). Additionally, there is a scale bar with 2 targets with a radius of 5mm.
For each subexperiment, a bundle of 12 images (see "image_orientations.png" in "test_field_radius_*mm/images_scale_bar_comparison_radius_*mm.zip") was recorded. The planar test fields have 127 circular targets. In addition to the 127 targets, there are the two scale bar radii.
All folders contain:
1) the initial values of the image orientaions with the projection center coordinates and the rotation angles.
rotMat = [[cosPhi*cosKappa, -cosPhi*sinKappa, sinPhi],\
[cosOmega*sinKappa + sinOmega*sinPhiCosKappa,\
cosOmega*cosKappa - sinOmega*sinPhiSinKappa,\
-sinOmega*cosPhi],\
[sinOmega*sinKappa - cosOmega*sinPhiCosKappa,\
sinOmega*cosKappa + cosOmega*sinPhiSinKappa,\
cosOmega*cosPhi]])
2) the image measurements in pixels: ellipse center x,y (pixel coordinate system in the left upper pixel, x to the right, y points down), semi-axes a and b. Star operator was used (edge detection with Laplacian of Gauss filter).
3) contour point coordinates of the star operator measurements.
4) initial circle parameters
5) for experiment 2 and 3: there is a additional pin file that contains the assignment of the image numbers and image names.
Innovativer Beitrag zur Kostenreduktion des Eisenbahnoberbaus durch theoretische Analysen, gestützt durch praktische Untersuchungen am „Wartungsarmen Oberbau“
(Technische Universität Dresden, 2026-01-28) Krumnow, Norman
Eisenbahninfrastrukturanlagen müssen eine hohe Verfügbarkeit und kontinuierliche Zuverlässigkeit gewährleisten, um die Mobilität im Sinne der Gesellschaft und des Wirtschaftsstandorts Deutschlands sicherzustellen. Gleichzeitig müssen sie sich an die fortschreitende Entwicklung der Transport- und Beförderungstechnologien anpassen. Um diese Anforderungen zu erfüllen, spielt die technische Ausrüstungsart der Gleisoberbauanlagen – unter Berücksichtigung der Lebenszykluskosten – eine zentrale Rolle.
Der Gleisoberbau unterscheidet grundsätzlich zwei etablierte Bauformen, den Schotteroberbau und die Feste Fahrbahn. Beide Systeme bieten jeweils spezifische Vor- und Nachteile. Aus ingenieurtechnischer Sicht ist es daher sinnvoll und zielführend, aus den beiden bestehenden Oberbauformen eine hybride Oberbauvariante zu entwickeln, die die Vorteile beider Konzepte vereint und ihre Nachteile weitgehend eliminiert. Diese hier entwickelte Wartungsarme Oberbauform verfolgt genau diesen Ansatz.
In zwei neu entwickelten Prüfverfahren konnte einerseits eine deutlich geringere Setzungsaffinität des wartungsarmen Oberbaus im Vergleich zu der des Schotteroberbaus nachgewiesen werden. Andererseits wurden die Dauerfestigkeit und die zu erwartende Betriebsdauer des Schienenstützpunktes (Direct Fixation Fastener 304 IVES) ermittelt.
Zur vergleichenden Bewertung der Lebenszykluskosten von Schotteroberbau, Fester Fahrbahn und Wartungsarmen Oberbau wurde eine Software entwickelt, die eine schnelle, auf den Belastungen basierende Berechnung ermöglicht. So konnte unter einer angenommenen 50%-igen Integration des Wartungsarmen Oberbaus in das Streckennetz der DB InfraGO AG eine fundierte Lebenszyklus-Analyse durchgeführt werden.
Bei positiver Akzeptanz der Ergebnisse und einer effektiven Umsetzung im Bereich der DB InfraGO AG könnten Einsparungen von etwa 200 Mio. Euro pro Jahr realisiert werden. Dies würde einen wertvollen Beitrag zur Verbesserung der Mobilität in der Gesellschaft leisten.