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Front of the Y-Building on the UPB Campus
Lightweight design is a key technology for sustainability Show image information

Front of the Y-Building on the UPB Campus Lightweight design is a key technology for sustainability

Photo: Photo Hankeln / Design Dohmeier-Fischer UPB

Publicatons

Here you will find a list of current publications by ILH scientists registered in the Research Information System (RIS) and an overview of dissertations published in the ILH's publication series.


The reports are linked in the side menu.

PhD Thesis

The dissertations, which are prepared in the ILH working groups, appear in the publication series "Institute for Lightweight Design with Hybrid Systems" published by Shaker-Verlag.

RIS Publications at Paderborn University


Open list in Research Information System

2021

Investigation and Modeling of the Residence Time Dependent Material Degradation in the Arburg Plastic Freeforming

E. Moritzer, F. Hecker, A. Hirsch, in: Proceedings: 2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021), 2021

The Arburg Plastic Freeforming (APF) is an additive manufacturing process with which three-dimensional, thermoplastic components can be produced layer by layer. One disadvantage of the APF is the long residence time of the molten material in the plasticizing unit compared to conventional injection moulding. The dosing volume is emptied very slowly due to only discharging fine plastic droplets. As a result, long residence times can be expected, which can lead to thermal degradation of the material. The aim of this study was to develop a model for calculating the residence time of the material in the APF. The residence time of the material in the thermally critical dosing volume is predicted using software developed in-house. The accuracy of the model could be verified by experimental investigations. Finally, the thermal degradation of the material was investigated by analyzing the correlation to the mechanical properties of tensile strength specimens.


    On the reliability of residual stress measurements in unidirectional carbon fibre reinforced epoxy composites

    A. Magnier, T. Wu, S.R. Tinkloh, T. Tröster, B. Scholtes, T. Niendorf, Polymer Testing (2021)


    Weiterentwicklung von GITBlow für dünnwandige Hohlstrukturen auf Organoblechen

    E. Moritzer, M. Kröker, CU reports (2021)


    Quasi in-situ analysis of fracture path during cyclic loading of double-edged U notched additively manufactured FeCo alloy

    S. Pramanik, A. Andreiev, K. Hoyer, M. Schaper, International Journal of Fatigue (2021)



    Load Path Transmission in Joining Elements

    C. Steinfelder, S. Martin, A. Brosius, T. Tröster, Key Engineering Materials (2021), pp. 73-80

    <jats:p>The mechanical properties of joined structures are determined considerably by the chosen joining technology. With the aim of providing a method that enables a faster and more profound decision-making in the spatial distribution of joining points during product development, a new method for the load path analysis of joining points is presented. For an exemplary car body, the load type in the joining elements, i.e. pure tensile, shear and combined tensile-shear loads, is determined using finite element analysis (FEA). Based on the evaluated loads, the resulting load paths in selected joining points are analyzed using a 2D FE-model of a clinching point. State of the art methods for load path analysis are dependent on the selected coordinate system or the existing stress state. Thus, a general statement about the load transmission path is not possible at this time. Here, a novel method for the analysis of load paths is used, which is independent of the alignment of the analyzed geometry. The basic assumption of the new load path analysis method was confirmed by using a simple specimen with a square hole in different orientations. The results presented here show a possibility to display the load transmission path invariantly. In further steps, the method will be extended for 3D analysis and the investigation of more complex assemblies. The primary goal of this methodical approach is an even load distribution over the joining elements and the component. This will provide a basis for future design approaches aimed at reducing the number of joining elements in joined structures.</jats:p>


      Microstructure transformations in a press hardening steel during tailored thermo‐mechanical processing

      H. Westermann, A. Reitz, R. Mahnken, M. Schaper, O. Grydin, steel research international (2021)

      Microstructure transformation due to thermo-mechanical processing have an acute effect the macroscopic properties of low carbon steels. This effect includes visco-plastic deformation and phase transformations. Hot forming processes such as press hardening are particularly affected. Most engineering applications require a combination of high strength and sufficient residual ductility, which can be achieved by the development of graded microstructures. In the present work, the evolution of phase transformations is investigated by linking experiments and simulations to produce graded microstructures. For this purpose, an extended material model is proposed to represent the evolution of phase transformations under inhomogeneous heating and cooling strategies. On the experimental side, phase transformations are identified during thermo-mechanical treatment of flat steel specimens using digital image correlation and thermal imaging. Based on the experimental results, the material parameters are identified, and the simulation model is validated. On the numerical side an algorithm for the finite-element simulation of phase transformations in low carbon steels is proposed. The evolution of phase transformations is presented for the simulation of tensile specimen employing the finite-element-method.


      Characterization of phase transformations during graded thermo- mechanical treatment of steel 22MnB5 by means of optical methods

      A. Reitz, O. Grydin, M. Schaper, Materials Data for Smart Forming Technologies (2021)


      Max number of publications reached - all publications can be found in our Research Infomation System.

      Open list in Research Information System

      Reports

      Institut für Leichtbau mit Hybridsystemen   2016/2017   2014/2015   2013    
                       
      Faculty of Mechanical Engineering 2018 2017 2016 2015 2014 2013 2012 2011
                       
      Faculty of Science 2017/2018   2015/2016   2013/2014   2011/2012 2009/2010
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      Forschung im Institut für Leichtbau mit Hybridsystemen

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      Contact

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      Institut für Leichtbau mit Hybridsystemen (ILH)

      Management of the Institute for Lightweight Design with Hybrid Systems

      Silvia Dohmeier-Fischer
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