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Publikationen von Professorinnen und Professoren der HAW Hamburg

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Aurelio Jose Olivares Ferrer und Markus Linke
Prediction of residual strength and delamination growth of thin CFRP laminates with re-infiltrated Barely-Visible-Impact-Damage
25 Oktober 2019
Universitat Politecnica de Valencia, in Valencia (Spain)
5th CARPE Conference

Schlüsselwörter: Composite materials; CFRP; Impact damage; BVID; Repairs; Re-infiltration; Finite element modeling; CAI test; 3PB fatigue; Ultrasonic C-Scans; Computer Tomography

Marker: F+F

Armin Laube, Peter Kuhn, Simon Ressel und Thorsten Struckmann
Entwicklung und Charakterisierung tubulärer PEM-Elektrolysezellen
25 Juni 2019
DVGW / BDEW Fachtagung „Wasserstoff – Baustein der Sektorenkopplung“

Marker: TI-MP

Markus Linke und Tim Tiedemann
"Individuelle online Lernwege in der Technischen Mechanik mit Maschinellen Lernverfahren" Posterbeitrag zum Fellowtreffen des Programms Innovationen in der Hochschullehre
15 März 2019
Deutscher Stifterverband für die Deutsche Wissenschaft

Marker: F+F

Konferenz-/Workshop-/Podiumsdiskussionsbeiträge, Ausstellungs-/Modenschaubeteiligungen:

Gerwald Lichtenberg
Forschungskolloquium "Strukturierte Beobachtung und Analyse mehrdimensionaler Prüfungen"
Hamburger Zentrum für universitäres Lehren und Lernen
27 November 2019

Marker: LS-MT

Aurelio Jose Olivares Ferrer und Markus Linke
Post-buckling behavior of thin-walled damaged laminates under Compression-After-Impact loading
3DEXPERIENCE Conference Design, Modeling and simulation 2019
Darmstadt, Germany
20 November 2019

Schlüsselwörter: Composite materials; CFRP; Impact damage; CAI test; Finite element modeling; Post-buckling

Marker: F+F

Zusammenfassung: The use of thin-walled Carbon-Fiber-Reinforced-Polymer (CFRP) laminates in structural components of aircraft is increasing in recent decades. These components are exposed to receive accidental impacts during its life, most of them classified as low-energy impacts. These impacts cause instances of internal damage in the components. Mainly, delaminations and matrix cracks. Therefore, the laminates used in the structure must be able to work below a certain damage threshold. In the aeronautical industry, the Compression-After-Impact (CAI) test is used to evaluate the residual strength of damaged laminates and there is plenty of open literature for thick laminates. However, when thin laminates are tested under the CAI test, global buckling starts before the laminate rupture. Then, there is an interaction between the global buckling and the local initial damage caused by the previous impact. Then, this become a problem with geometrical and material non-linearities that can be investigated by using the Finite Element code Abaqus (Dassault Systèmes SA, Paris, France). Therefore, this work focuses on how to build-up a model able to predict the residual strength of thin CFRP laminate plates with an idealized initial damaged area under the CAI test. For this purpose, conventional and continuum shell elements are used for verifying the build-up process of the model, as well as, implicit and explicit solver. Finally, Hashin’s criteria and cohesive elements are used to predict the intralaminar failure and delamination growth in the interfaces, respectively.

Carlos Cateriano Yáñez, Jörg Richter, Georg Pangalos, Gerwald Lichtenberg und Javier Sanchís Saez
Active Power Filter Shape Class Model Predictive Controller tuning by Multiobjective Optimization
CARPE Conference 2019: Horizon Europe and beyond
Oktober 2019

Marker: LS-MT

Dirk Jacob und Gerwald Lichtenberg
Automatisierte Gebäudebetriebsoptimierung
Bauen Zentrum für Energie (Hrsg.)
Workshop Effiziente Gebäude 2019
Hafen City Universität Hamburg
September 2019

Marker: LS-MT

Aurelio Jose Olivares Ferrer, Markus Linke und Juan Antonio García Manrique
Influence of geometric imperfections and internal damage patterns of thin-walled laminates on failure in Compression-After-Impact testing
MESIC 2019 conference
Madrid (Spanien)
20 Juni 2019

Schlüsselwörter: Finite elements; Abaqus; Compression-After-Impact testing; geometric imperfection; delamination; internal damage; composites; CFRP; ultrasonic scan; low-energy impacts.

Marker: F+F

Zusammenfassung: Geometric imperfections are induced in composite structures due to manufacturing and assembly processes as well as due to accidental impacts. These geometric imperfections have an influence on the strength of thin-walled composite structures when impact damage is present. Therefore, the influence of the geometric imperfection magnitude on the failure mechanisms of thinwalled laminates with initial internal damage patterns under Compression-After-Impact testing is investigated by creating a finite element model based on different experimental validations. These experiments are a set of tensile tests, low energy impact tests with a pendulum system to induce the internal damage patterns, ultrasonic scanning of the damaged samples to characterize the delaminated areas and, finally, a set of Compression-After-Impact tests combined with digital imaging correlation data using an ARAMIS 3D measuring system (Gom mbH, Braunschweig, Germany). Compression-After-Impact tests are carried out with a frame modified for thin-walled laminates enabling a more reliable measurement of thin laminates. All these data collected during the experiments and damage inspections are used to build up and validate the simulations with the Finite Element code Abaqus (Dassault Systèmes SA, Paris, France). Finally, potential interactions between global and local failure mechanisms in Compression- After-Impact testing are analyzed with different imperfection magnitudes and interface damage idealizations based on these models. The results show an increase of the failure strength with the initial imperfection magnitude.

Gerwald Lichtenberg
Systematische MINT-Prüfungen und Ergebnisvisualisierung durch Kompetenzgraphen
Der Fachdidaktik-Arbeitskreis Mathe/Physik
Technische Hochschule Rosenheim
17 Mai 2019

Marker: LS-MT



Emmanuel Baccelli, Cenk Gündogan, Oliver Hahm, Peter Kietzmann, Martine Lenders, Hauke Petersen, Kaspar Schleiser, Thomas C. Schmidt und Matthias Wählisch
RIOT: an Open Source Operating System for Low-end Embedded Devices in the IoT
IEEE Internet of Things Journal, 5(6):4428--4440
Dezember 2018

Marker: TI-I

Zusammenfassung: As the Internet of Things (IoT) emerges, compact operating systems are required on low-end devices to ease development and portability of IoT applications. RIOT is a prominent free and open source operating system in this space. In this paper, we provide the first comprehensive overview of RIOT. We cover the key components of interest to potential developers and users: the kernel, hardware abstraction, and software modularity, both conceptually and in practice for various example configurations. We explain operational aspects like system boot-up, timers, power management, and the use of networking. Finally, the relevant APIs as exposed by the operating system are discussed along with the larger ecosystem around RIOT, including development and open source community aspects.

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Letzte Änderung: 23.01.15

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