Christian Liebold

Christian Liebold
DYNAmore GmbH · Method development

Diplom

About

35
Publications
6,393
Reads
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23
Citations
Introduction
Developing mapping methods to close the simulation process chain for several disciplins such as metal forming, (short) fiber reinforced plastic components, bake-hardening effects.

Publications

Publications (35)
Conference Paper
Full-text available
Automotive interior components in upper-class vehicles are often made of wood veneer sheets that are subject to a forming process [1]. Due to the anisotropy and inhomogeneity of the material caused by the development of annual rings during the growth of the tree, establishing a stable production process based on trial-and-error forming tests is tim...
Article
Full-text available
In automotive manufacturing, laminated veneer sheets are formed to have 3D geometries for the production of trim parts with wood surfaces. Nowadays, investigation of the formability requires extensive tests with prototype tools, due to the brittle, anisotropic and inhomogeneous material behaviors. The present paper provides numerical methods for th...
Article
Full-text available
This research work investigated the influence of the press molding manufacturing process on the mechanical properties, both for thermoplastic and thermosetting fiber reinforced composite materials. The particular geometry of the case study, called Double Dome, was considered in order to verify the behavior of the Thermoplastic and Thermosetting pre...
Article
Full-text available
Failure and deformation behavior of veneer laminates of ring porous wood species vary with the individual arrangement of early- and latewood zones over a veneer sheet. Therefore, a method is presented, where local failure and damage modes are considered for finite element models with respect to forming simulations, during the development process of...
Conference Paper
https://www.dynalook.com/conferences/16th-international-ls-dyna-conference/aerospace-t9-1/t9-1-a-aerospace-186.pdf/view
Chapter
Im Folgenden soll der im Rahmen vom Digitalen Prototyp entwickelte Datenaustauschcontainer vorgestellt und erläutert werden. Die Entwicklung wird im Rahmen des Anschlussprojektes Digitaler Fingerabdruck fortgeführt, so dass die hier vorgestellte Lösung noch nicht als vollständig betrachtet werden kann vgl. Kommentar Christian.
Chapter
Das Übertragen oder auch Mappen von Simulationsergebnissen von einem Prozessschritt auf den Nachfolgenden stellt einen zentralen Bestandteil des Digitalen Prototyps dar. Hierfür wurde das Tool envyo® verwendet und weiterentwickelt. Im Folgenden werden die entwickelten Übertragungsmethoden zwischen den verschiedenen Prozessschritten vorgestellt und...
Book
Der Forschungscampus ARENA2036 ist ein neuer, langfristiger Projektansatz, der vom deutschen Bundesministerium für Bildung und Forschung (BMBF; Forschungscampus ARENA2036) finanziert wird. Er ist einer der neun großen wissenschaftlichen Campi in Deutschland und ist der einzige, der direkt in die Hauptphase (Phase 1) gestartet ist. Die ARENA2036 bef...
Conference Paper
Full-text available
In the recent past, a lot of effort has been made towards the closing of the simulation process chain for all different kinds of materials. Besides the regular transfer of resulting stress, strain, and history data, main focus from a material’s perspective has been on the transfer of fiber orientations from process simulations for continuous fiber...
Conference Paper
Mitte 2018 und nach fünf Jahren Forschungszeit kommt eines der drei technischen Startprojekte der ARENA2036 zum Ende. Zu diesem Anlass und als Projektabschluss sollen Forschungsergebnisse aus dem Projekt DigitPro vorgestellt werden. Der Digitale Prototyp stellt das Bindeglied zwischen klassischen Ingenieurstätigkeiten und der Industrie 4.0 dar. Bau...
Conference Paper
Full-text available
Manufacturing processes and parameters have played a crucial role in the design and analysis of composite structures. To exploit potential advantages of composite materials, it is necessary to predict and optimize the manufacturing steps in respect to the optimization of the structure itself. During the past years, the project DigitPro (Digital Pro...
Chapter
Since about three years, DigitPro, a sub-project of the government funded research project Active Research Environment for the Next generation of Automobile (ARENA2036) works on the development of a Digital Prototype, a closed simulation process chain which not only covers different simulation disciplines such as crushing or process analysis, but a...
Conference Paper
Since about three years, DigitPro, a sub-project of the government funded research project Active Research Environment for the Next generation of Automobile (ARENA2036) works on the development of a Digital Prototype, a closed simulation process chain which not only covers different simulation disciplines such as crushing or process analysis, but a...
Conference Paper
Standard approaches for the modelling and simulation of composite structures rely on the homogenisation of material properties on unidirectional plies. Doing so, simulations lose the ability to precisely describe local phenomena and complex failure mechanisms. In the research campus ARENA2036, the project DigitPro (Digital Prototype) develops a met...
Conference Paper
Full-text available
This paper discusses manufacturing process, experimental testing and numerical simulation of braided Ω-frame segments bonded to a multiaxial fabric skin which represent the typical airframe structure. The Ω-frame preforms were manufactured using the circular braiding process and impregnated with resin by Vacuum Asissted Process (VAP) technique. The...
Presentation
Full-text available
The Simulation Process Chain: From Manufacturing to Part Performance of Composites
Conference Paper
Full-text available
As there is a trend in the automotive industry towards using FRP composites for reducing the weight of vehicles, adequate simulation tools to effectively and accurately predict the structural response of composite structures in crashworthiness are needed. Due to the manufacturing induced fiber orientation, which is particularly for short fiber rein...
Presentation
Full-text available
Integrative Simulation for short and continuous fiber reinforced composites
Conference Paper
Teil des Forschungscampus ARENA2036 ist das Projekt DigitPro – Digitaler Prototyp. Entwickelt wird hier eine geschlossene, numerische Prozesskette zur Auslegung und Optimierung von textilbasierten Bauteilen aus Faserkunststoffverbund (FKV). Ziel ist es, den realen Produktentstehungsprozess zu unterstützen sowie die Entwicklungszeiten und -kosten zu...
Conference Paper
Full-text available
The paper describes parts of the joint research project Swim-RTM including several industrial and academic partners. Its goal is to combine LS-DYNA and the open-source CFD solver OpenFOAM to simulate the production process of continuous fiber-reinforced plastics, particularly the resin-transfer-molding (RTM) process, in which the layers of dry fabr...
Presentation
Full-text available
Recent developments and trends for composite modeling in LS-DYNA
Conference Paper
Full-text available
In order to fulfill the growing needs to capture the processing parameters of continuous fiber-reinforced plastics with finite-element simulations, a new anisotropic material model has been implemented in LS-DYNA. The objective of this implementation is to provide a flexible and accurate formulation for the simulation of thermoforming and draping s...
Article
Since March 2011, car manufacturers have to consider the newly released Federal Motor Vehicle Safety Standard 226 Ejection Mitigation (FMVSS 226) during the vehicle development and for the final testing prior to release. This safety standard shall prevent vehicle occupants from being ejected through the vehicle’s side windows made out of laminated...
Article
Die derzeitigen Entwicklungen im Bereich der Faserkunststoffverbunde führen zu immer neuen Fragestellungen entlang der gesamten CAX-Prozesskette und hier gerade in der simulationstechnischen Auslegung von Prozessen und Bauteilen. Eine besondere Herausforderung stellt dabei der Übergang von der Prozess- zur Gebrauchstauglichkeitssimulation dar. Der...
Presentation
Full-text available
The usage of fiber reinforced plastics (FRP) becomes more and more important in the automotive industry and therefore, the requirements for accurate crash analysis results for such materials increase. As already known from sheet metal forming, process simulations are performed to predict fiber orientations for all kinds of short, long or endless fi...
Presentation
Full-text available
Potential modeling techniques of laminated glass for pedestrian protection and ‘Ejection Mitigation’
Presentation
Full-text available
Fiber reinforced polymers (FRP) will play an ever increasing, important role in future lightweight designs of transportation systems like aircrafts, railway systems and automobiles. Especially the current overwhelming trend to electric mobility – with or without a suitable hybrid technology - will only succeed if vehicles can be made much lighter i...
Presentation
Die derzeitigen Entwicklungen im Bereich der Faserkunststoffverbunde führen zu immer neuen Fragenstellungen entlang der gesamten CAX-Prozesskette und hier gerade in der simulationstechnischen Auslegung von Prozessen und Bauteilen. Eine besondere Herausforderung stellt dabei der Übergang von der Prozess- zur Gebrauchstauglichkeitssimulation dar. Der...
Article
Die verstärkte Anwendung von Faser-Kunststoff-Verbunden im Automobilbau, getrieben durch extreme Leichtbauanforderungen, stellt neue Herausforderungen an die Weiterentwicklung von Finite-Elemente-Software. Hierbei erweisen sich Fragestellungen zum Crashverhalten von Bauteilen nur als lösbar, indem Modellparameter aus der Fertigungsprozesskette Berü...

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Projects

Projects (3)
Project
Follow-up project of DigitPro Enhance simulation data with measured sensor data
Project
The project VMAP aims to gain a common understanding and interoperable definitions for virtual material models in CAE and to establish an open and vendor-neutral ‘Material Data Exchange Interface Standard’ community which will carry on the standardisation efforts into the future.
Archived project
Definition of a digital Prototype and a closed simulation process chain for fiber reinforced plastic materials