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Aufsatz
Characterization of Mechanical Properties, Macroscopic Deformation Behavior, and Microstructure of Functionally Graded 22MnB5 Steel
(2021-03-24)
The focus of this study is on the characterization of the local plastic deformation and failure of functionally graded 22MnB5 plates after hot stamping using an in situ approach. Various forming strategies at elevated temperatures are performed using differentially tempered forming tools to locally tailor the microstructure. By controlling the cooling rate, graded as well as martensitic and ferritic–pearlitic microstructures are obtained. Experimental analysis includes evaluation of the material- and geometry-dependent ...
Aufsatz
On the Microstructural and Cyclic Mechanical Properties of Pure Iron Processed by Electron Beam Melting
(2021-03-10)
Additive manufacturing (AM) processes such as electron beam melting (EBM) are characterized by unprecedented design freedom. Topology optimization and design of the microstructure of metallic materials are enabled by rapid progress in this field. The latter is of highest importance as many applications demand appropriate mechanical as well as functional material properties. For instance, biodegradable implants have to meet mechanical properties of human bone and at the same time guarantee adequate cytocompatibility ...
Aufsatz
On the Influence of Microstructure on the Corrosion Behavior of Fe–Mn–Al–Ni Shape Memory Alloy in 5.0 wt% NaCl Solution
(2020-10-03)
Herein the corrosion behavior of Fe–Mn–Al–Ni shape memory alloys characterized by different microstructures in a 5.0 wt% NaCl solution is investigated. Open circuit potential and potentiodynamic polarisation tests are conducted. Generally, Fe–Mn–Al–Ni shows corrosion properties being similar to pure iron. However, the polarization curves of single crystals indicate the presence of an unstable passive system. The corrosion damage is analyzed by means of optical microscopy and electron microscopy. It is revealed that ...
Aufsatz
Thermal Stability of Residual Stresses in Differently Deep Rolled Surface Layers of Steel SAE 1045
(2021-05-07)
The stability of compressive residual stresses generated by deep rolling plays a decisive role on the fatigue behavior of specimens and components, respectively. In this regard, deep rolling at elevated temperature has proven to be very effective in stabilizing residual stresses when fatigue analysis is conducted at ambient temperature. However, since residual stresses can be affected not only by plastic deformation but also when thermal energy is provided, it is necessary to analyze the influence of temperature and ...
Dissertation
Begriff und Psychodynamik des Scheiterns aus psychoanalytischer Sicht am Beispiel des „König Lear Opern Projekts“ von Giuseppe Verdi
(2024)
Die vorliegende Untersuchung fokussiert sich auf die Frage, weshalb sich Giuseppe Verdi als überaus erfolgreicher Komponist von 26 Opern 50 Jahre damit beschäftigte, den „König Lear“ von William Shakespeare zu vertonen, ohne das Projekt jemals auf die Bühne zu bringen. Verdis wiederholtes Aufgreifen und Wiederfallenlassen des Projekts verweisen auf ein hohes Maß an Ambivalenz, sodass sich darüber eine psychoanalytische Fragestellung legitimiert. Die psychoanalytische Untersuchung zielt auf den Zusammenhang zwischen ...
Dissertation
Plant growth, water quality, carbon and nutrient flows in rural-urban cropping systems of Bengaluru, India
(2024)
The global urban population is expected to reach 5.2 billion by 2030 and by mid-2023 approximately 4.6 billion out of more than 8 billion population were living in towns or cities. This represents approximately 57% of the total global population and is set to reach 60% by 2030. India’s urban population is expected to reach 607 million by 2030 and by mid-2030 40% of the total population will be living in urban areas. Growing urban population has multi-sectoral and dimensional implications in the rural, peri-urban, and ...
Zeitschrift
Jahresbericht 2009 / KDEE
(Universität Kassel, Kompetenzzentrum für Dezentrale Elektrische Energieversorgungstechnik (KDEE), 2010-03)
Working paper
Digitalisierung der hessischen Arbeitswelt
(2024-05)
Dieses Policy Paper fokussiert sich in der Betrachtung der Folgen der Digitalisierung der hessischen Arbeitswelt auf den Teilbereich der sozialen Dimension. Die technologische und infrastrukturelle Ebene der Digitalisierung wurden bereits im ersten Teil des Policy Papers behandelt. Soweit die Datenlage es zulässt, werden relevante Zahlen zur hessischen Arbeitswelt dargestellt, alternativ wird auf bundesweite Daten rekurriert. Im nachfolgenden Kapitel 2 werden zunächst einige der mit Digitalisie-rungsprozessen in der ...
Working paper
The historical relationship between extractivism and state weakness in Bolivia: a brief political and economic analysis
(2024-05-17)
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Die historische Abhängigkeit von Einnahmen aus dem Extraktivismus trägt zur strukturellen Schwäche des bolivianischen Staates bei.
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Diese Einnahmen werden selten massenwirksam umverteilt. Regierungskoalitionen begünstigen lediglich Teile der Gesellschaft.
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Politische Koalitionen in Bolivien sind wandelbar und dynamisch. Der Staat ist in einer ständigen Verhandlung mit Akteuren gefangen, die einen größeren Anteil an den extraktiven Einnahmen beanspruchen.
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Innenpolitische Faktoren erklären die Aneignung ...
Aufsatz
Cooling rate as a process parameter in advanced roll forming to tailor microstructure,mechanical and corrosion properties of EN AW 7075 tubes
(2022-12-14)
The effects of solution heat treatment parameters and quench media as a processing tool for tailoring microstructure, mechanical and corrosion properties in roll forming of EN AW 7075 alloy were studied. The highest yield stress and ultimate tensile strength were obtained for the specimens quenched in water, while the air-cooled specimens exhibited inferior mechanical properties. Microstructural analysis of specimens showed that except water-quenched specimens, the parts cooled/quenched in oil, in direct contact with ...