11 Interfakultäre Einrichtungen

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    Simulation model for digital twins of pneumatic vacuum ejectors
    (2022) Stegmaier, Valentin; Schaaf, Walter; Jazdi, Nasser; Weyrich, Michael
    Increasing productivity, as well as flexibility, is required for the industrial production sector. To meet these challenges, concepts in the field of “Industry 4.0” are arising, such as the concept of Digital Twins. Vacuum handling systems are a widespread technology for material handling in industry and face the same challenges and opportunities. In this field, a key issue is the lack of Digital Twins containing behavior models for vacuum handling systems and their components in different applications and use cases. A novel concept for modeling and simulating the fluidic behavior of pneumatic vacuum ejectors as key components of vacuum handling systems is proposed. In order to increase the simulation accuracy, the concept can access instance‐specific data of the used asset instead of object‐specific data. The model and the data are part of the Digital Twins of pneumatic vacuum ejectors, which shall be able to be combined with other components to represent a Digital Twin of entire vacuum handling systems. The proposed model is validated in an experimental test setup and in an industrial application delivering sufficiently accurate results.
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    Martensite fractions measured by XRD on fracture surfaces of austenitic stainless steels tensile tested in gaseous helium and hydrogen
    (2022) Berreth, Karl; Michler, Thorsten
    Although martensitic transformation is neither necessary nor sufficient to explain hydrogen effects in austenitic stainless steels, the formation of a second phase upon straining results in local strain incompatibilities within the microstructure which can result in hydrogen assisted crack initiation. The fraction of α’-martensite on fracture surfaces of ten commercial austenitic stainless steels of different austenite stability was measured by quantitative x-ray diffraction (XRD). The main results are: (1) for a given steel, martensite contents on fracture surfaces of specimens tested in helium were higher compared to those tested in hydrogen and (2) tensile reduction in area of the specimens tested in hydrogen decreases with increasing martensite content on the fracture surface.