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Aufsatz
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An auxiliary crack approach for efficient approximative crack tip loading analyses
(2021-10-20)
An efficient approach based on the path-independent interaction-integral (I-integral) is suggested for assessing the crack tip loading in elastic structures without having to geometrically model a physical crack. Exploiting just the elastic solution of the uncracked structure, the I-integral is adapted incorporating the closed formulation of crack tip stress and displacement fields of an auxiliary crack, which in this approach is interpreted as hypothetical physical crack. Different specimens and crack configurations ...
Aufsatz
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On the Impact of Build Envelope Sizes on E-PBF Processed Pure Iron
(2021-11-17)
In additive manufacturing, the thermal history of a part determines its final microstructural and mechanical properties. The factors leading to a specific temperature profile are diverse. For the integrity of a parameter setting established, periphery variations must also be considered. In the present study, iron was processed by electron beam powder bed fusion. Parts realized by two process runs featuring different build plate sizes were analyzed. It is shown that the process temperature differs significantly, ...
Aufsatz
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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
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Challenges in Solid Waste Management: Insights Into the Disposal Behavior of Suburban Consumers in Guatemala City
(2021-07-09)
Help, I need to get rid of it! In suburban areas of Guatemala City, inhabitants dispose of their household waste by burning it on their private property. Garbage collection coverage in the capital is inadequate, with only 85% of the generated waste being collected and collection rates in suburban areas lag far behind. This study examines the critical events, decisions and emotions linked with the disposition of household items of impoverished consumers living in the suburban area of Cumbre de San Nicolás near Guatemala ...
Aufsatz
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Betriebliche Mobilitätsmanagementmaßnahmen – ein Anstoß für Veränderungen in Mobilitätsverhalten und -einstellungen Mitarbeitender?
(2021-06-09)
Betriebliches Mobilitätsmanagement (BMM) fokussiert auf die Verkehrsgestaltung hinsichtlich Pendel- und Berufsverkehr, Dienstreisen und Kundenverkehr. Ziel ist es, beispielsweise Parkplatzauslastungen zu verringern oder Verhaltensänderungen bei den Mitarbeitenden hinsichtlich der Verkehrsmittelwahl hervorzurufen. Bisher ist BMM in Deutschland wenig implementiert und in geringem Umfang erforscht.
Vor diesem Hintergrund stellt dieser Artikel das Instrument BMM theoretisch dar und präsentiert ein zugehöriges ...
Aufsatz
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CuCrZr processed by laser powder bed fusion — Processability and influence of heat treatment on electrical conductivity, microstructure and mechanical properties
(2021-06-16)
CuCrZr parts were fabricated by laser beam powder bed fusion (LB-PBF) technique and subjected to different heat treatments. As a result, four different conditions were considered for further investigations, that is, the as-built condition, conditions of maximum hardness (MH) and maximum electrical conductivity (MC), and a condition representing a compromise between hardness and conductivity (H&C). Microstructural evolution and performance under monotonic and cyclic loading were studied. Fracture surfaces revealed ...
Aufsatz
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Sustainable Development Goal Drivers in Food Systems
(2021-06-29)
Interacting driving forces in food systems, resulting in cumulative driver effects and synergies, induce non-linear processes in multiple directions. This paper critically reviews the discourse on driving forces in food systems and argues that mindset is the primary predictor for food system outcomes. In the epoch of sustainable development goals (SDGs) and the Anthropocene, mindset matters more than ever. Transformative narratives are beginning to transcend the dominant social paradigm, which is still driving the ...
Aufsatz
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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 ...
Aufsatz
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Agilität – ein Organisationsmodell für öffentliche Verwaltungen
(2021-07-07)
Dieser Artikel zeigt auf, weshalb das Organisationsmodell Agilität als Reformkonzept für öffentliche Verwaltungen geeignet ist und einen wesentlichen Beitrag zu den noch offenen Themen aus bisherigen Reformen leisten kann. Dies wird entlang den Dimensionen Legitimation (Strategie), Governance (Struktur und Prozesse), Digitalisierung (Technik) und Führung begründet. Führungskräften in öffentlichen Verwaltungen kommt eine zentrale Schlüsselrolle bei den anstehenden Reformen zu. Das Führungsset „Agile Five“, das eine ...
Aufsatz
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Unterstützung digitaler Bildungsprozesse durch interaktive gamifizierte Lernvideos – Wie innovative Lernvideos Motivation und Lernerfolg steigern können
(2021-10-11)
Digitales Lernen ist ein zentraler Bestandteil der heutigen Bildungslandschaft geworden. Insbesondere Lernvideos haben in den letzten Jahren deutlich an Popularität gewonnen und Plattformen wie YouTube sind heute ein fester Bestandteil von Lernprozessen. Bildungseinrichtungen haben diese Entwicklung erkannt und Lernvideos in ihre Lernsysteme integriert. Allerdings sind die heutigen Lernvideos oft nicht sehr ansprechend, weil es an Gestaltungswissen mangelt, wie Interaktionen und gamifizierte Elemente die Motivation ...