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Aufsatz
A Novel Approach to Robustly Determine Residual Stress in Additively Manufactured Microstructures Using Synchrotron Radiation
(2021-07-29)
In recent decades additive manufacturing (AM) for years has been in focus of academia and industry as its underlying production principle allows for the realization of designs of unprecedented geometrical complexity. However, often such structures are not realized due to the lack of understanding of structural and mechanical properties, this fact amongst others related to the unique microstructures established by the related processes. In this context, residual stresses, highly affected by the scan strategy and process ...
Aufsatz
Effect of Crystallographic Orientation and Grain Boundaries on Martensitic Transformation and Superelastic Response of Oligocrystalline Fe–Mn–Al–Ni Shape Memory Alloys
(2021-07-26)
In situ tensile tests employing digital image correlation were conducted to study the martensitic transformation of oligocrystalline Fe–Mn–Al–Ni shape memory alloys in depth. The influence of different grain orientations, i.e., near-〈001〉 and near-〈101〉, as well as the influence of different grain boundary misorientations are in focus of the present work. The results reveal that the reversibility of the martensite strongly depends on the type of martensitic evolving, i.e., twinned or detwinned. Furthermore, it is ...
Video
LA ARQUITECTURA DE AREQUIPA
(2023-04-14)
Los tiempos de la arquitectura de Arequipa responden, más que a clasificaciones historicistas estilísticas, a las frecuencias de los sismos. Entender esto exige aceptar persistencias y fragmentaciones en una misma obra, que en su conjunto adquiere, más allá de expresar un modo de vida, una compleja espacialidad, funcionalidad y construcción.
Resulta una arquitectura que según el sino de su tiempo sabe ser renacentista, manierista, barroca o neoclásica, integrando lo necesario para hacer posible la continuidad de la ...
Aufsatz
Simultaneous impact modified and chain extended glass fiber reinforced poly(lactic acid) composites: Mechanical, thermal, crystallization, and dynamic mechanical performance
(2021-02-05)
Herein, glass fiber (GF) reinforced binary, ternary, and quaternary poly(lactic acid) (PLA) composites were prepared. Toughening, and chain extension of PLA was achieved through the incorporation of impact modifier and chain extender and their concurrent effects on the spectroscopic, crystallization, mechanical, thermal, and thermomechanical properties of the composites were investigated. High mechanical properties of GF influenced the mechanical performance of the composites. However, GF alone could not restrict the ...
Aufsatz
On the Monotonic and Cyclic Behavior of an Al-Mg-Zn-Cu-Si Compositionally Complex Alloy
(2023-08-03)
In present work, the monotonic and cyclic properties of a novel Al-Mg-Zn-Cu-Si compositionally complex alloy (CCA) are investigated. Microstructural studies reveal that a eutectic phase and fishbone-type structures are embedded in the Al-matrix. The mechanical properties of this CCA obtained under compressive loading are found to be promising. However, low ultimate strength and brittle behavior are seen under tension. The fatigue performance of the alloy in the low-cycle fatigue (LCF) regime is poor. Microstructural ...
Aufsatz
Liquid Silicone Rubber Foams Made with Water as Blowing Agent
(2021-08-18)
Liquid silicone rubber (LSR) is primarily used in injection molding. Foamed molded parts made of LSR are almost nonexistent because the process reliability of LSR foam injection molding is currently not given. It makes sense to have suitable foaming processes for this material as well, because the density of this elastomer is about 1.15 g cm−3. With the injection molding process presented herein for foaming LSR, density reductions of up to 40% can be achieved. In this process, up to 3% by weight of water is added to ...
Teil eines Buches
Dynamiken in der Kartographie um 1500
(De Gruyter, 2021)
Auf der Suche nach dem ‚richtigen‘ kartographischen Wissen prallten im 15. Jahrhundert recht gegensätzliche Vorstellungen aufeinander: Die praktischen Erfahrungen von Seeleuten standen gegen die Anschauungen der gelehrten Kosmographen, die neuen Entdeckungen des Christoph Kolumbus gegen die alten Vermessungen des Claudius Ptolemäus, mündlich vorgetragene Erklärungen gegen schriftlich tradierte Einsichten, die Erweiterungen des geographischen Weltbilds gegen allgemein bekannte Traditionen, lokale Verfahrensweisen gegen ...
Rezension
[Rezension zu:] Alfred Hiatt (Ed.), Cartography between Christian Europe and the Arabic-Islamic World, 1100–1500. Divergent Traditions. (Maps, Spaces, Cultures, Vol. 3.) Leiden, Brill 2021. 238 S., Abb., € 100,58.
(2022-12-01)
Rezension von Ingrid Baumgärtner zu: Alfred Hiatt, Cartography between Christian Europe and the Arabic-Islamic World, 1100–1500. Divergent Traditions. Maps, Spaces, Cultures, Vol. 3. 2021 Brill Leiden, 978-90-04-44491-1, € 100,58
Aufsatz
Hot Sheet Metal Forming Strategies for High-Strength Aluminum Alloys: A Review—Fundamentals and Applications
(2023-05-17)
In the past decade, aluminum alloys have become important structural materials in the automotive industry, thanks to their low density, high strength, high fracture toughness, and good fatigue performance. However, an important limitation of aluminum alloys is their poor formability at room temperature; as a result, numerous studies have been conducted with the aim of developing forming techniques to overcome this and facilitate the forming of more complex-shaped components. Following an overview on the metallurgical ...
Aufsatz
Experimental Analysis of the Stability of Retained Austenite in a Low-Alloy 42CrSi Steel after Different Quenching and Partitioning Heat Treatments
(2023-06-21)
Quenching and partitioning (Q&P) steels are characterized by an excellent combination of strength and ductility, opening up great potentials for advanced lightweight components. The Q&P treatment results in microstructures with a martensitic matrix being responsible for increased strength whereas interstitially enriched metastable retained austenite (RA) contributes to excellent ductility. Herein, a comprehensive experimental characterization of microstructure evolution and austenite stability is carried out on a ...