Folie 1 - Professur Strukturleichtbau und Kunststoffverarbeitung

Folie 1 - Professur Strukturleichtbau und Kunststoffverarbeitung

Research Group
Computation, Simulation and Design (BSA)
Strukturleichtbau
Kunststoffverarbeitung
Univ.-Prof.
Dr.-Ing. habil.
Lothar Kroll
Head of Research Group
Director of IST
Director of Affiliated
Institute „CETEX“
• 1987 Graduate Engineer (Dipl.-Ing.) in
Mechanical Engineering at TU Clausthal
• 1992 Doctorate (Dr.-Ing.) at Institute of
Mechanics at TU Clausthal
• 2005 Habilitation at TU Dresden
• 2006 Full Professor for Lightweight Structures
and Polymer Technology (SLK) at Chemnitz
University of Technology
Process and structure simulation
Main fields of research
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Design of highly stressed load transmission
systems
Current research projects
Equipment (Selection)
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Hardware
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• Server AMD Opteron 2x12 Core CPU,
48 GB RAM
• Precision Desktop Workstation T5500,
2xQuadCore Xeon CPU, 24 GB DDR3 RAM,
300 GB (10000 rpm) SATA Hard Drive
• Berechnungsserver 2xQuadCore Xeon CPU,
16 GB RAM, 4xHDD 1 TB
• 15 Workstations, je 8 GB RAM, 1 TB HD
Software
• FEM: ANSYS (Classic und Workbench),
Abaqus, Hyperworks, LS-DYNA, Moldflow
• Maths: MATLAB, scilab, MathCAD, ExcelSolver, LabVIEW, Maxima, Mathematica
• Special software: ESAComp, ComPoLyx,
DIGIMAT, ANSYS Composite PrepPost
(ACP), Composite Modeler for Abaqus
(CMA), ANSA
• Custom-made software: CT-DAS, FE-Cun,
Optisolv, Tuc-Tub, Tuc-Not, PLaB
• CAD: SolidWorks, CATIA V5, Inventor
Development and simulation of fibre-reinforced
composite structures
Stress adapted dimensioning of load transmission
systems in composite construction
Structure und process simulation by means of
numerical and analytical methods
Application of physically based failure criteria and
degradation models
Preparation of guidelines for fibre-reinforced
structures (IASB)
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Combined mechanical-medial ageing of riveted
connection between metal and composite plates
Future-oriented technologies using the example of
a lightweight robot (junior research group:
MoLeiRo)
Composite optimized design of high-performancestructures in hybrid constructions
Shape-adapted pressure vessels in ultra
lightweight construction
Topology and fibre optimized multi-componentstructures
Simulation of active components and systems
Physically based failure analysis
Research Group
Computation, Simulation and Design (BSA)
Strukturleichtbau
Kunststoffverarbeitung
Simulation portfolio
Publications (Outline)
Design of fibre-reinforced plastics (FRP)
• Classical laminate theory (CLT), net theory, regression analysis
• Physically based failure criteria and degradation models
• Optimization of laminate lay-ups regarding fibre/matrixcombination, orientation, thickness and number of lamina
• Kroll, L.; Czech, A.; Ulke, L.; Müller, S.: Mechanical behaviour
of bolted joints with load adapted fibre orientation by variable
axial fibre placement. 16th International Conference on
Mechanics of Composite Materials. Riga (Latvia): 2010.
• Kaufmann, J.; Klärner, M.; Kroll, L.; Mäser, M.; Engisch, L.;
Zschage, V.: Rotation-symmetric fibre-plastic composite parts
with anisotropic coupling effect for a novel shaft-hub joint. 16th
International Conference on Mechanics of Composite Materials.
Riga (Latvia): 2010, S. 99.
• Klärner, M.; Iwan, S.; Kroll, L.: Akustische Charakterisierung
von Verbundstrukturen mit Papierwabenkernen. DAGA 2010.
36. Jahrestagung für Akustik. Berlin: 2010.
• Kroll, L.; Müller, S.: Modeling and simulation of highperformance structures in fibre composites construction.
Meeting of the European Alliance for Thermoplastic Composites
(EATC). Frankfurt am Main: 2010.
• Ulke, L.; Kroll, L.; Seidlitz, H.: Discrete optimization of laminate
stacking sequence according to failure criteria. Methods of
Artificial Intelligence. AI-Meth Series. Gliwice (Poland): 2009,
S. 57-58.
• Kroll, L.; Ehrlinspiel, H.; Czech, A.; Müller, S.: Identification of
Anisotropic Damage on CFRP Tubes Using Computer
Tomography and Automated Analysis Methods. 17th
International Conference on Composite Materials (ICCM17).
Edinburgh (UK): 2009.
• Klärner, M.; Marburg, S.; Kroll, L.: Vibro-Acoustic
Characterisation of Thermoplastic Fibre Reinforced
Composites. International Conference on Acoustics. Sydney
(Australia): 2010.
• Kaufmann, J.; Kroll, L.; Odenwald, S.: Bedarfsgerechte
Auslegung von Sportgeräten aus anisotropen Faser-KunststoffVerbunden mit steifigkeitsbedingten Koppeleffekten. In:
Meynerts, P. (Hrsg.): 12. Chemnitzer Textiltechnik-Tagung.
Chemnitz: TU Chemnitz, 2009.
Application of the finite element method
• Computation of static problems:
− mechanical, thermal, medial
− elastic, visco-elastic, hyperelastic, plastic, anisotropic,...
− in accordance with failure, stiffness and stability
• Computation of dynamic problems:
− eigenvalue problems
− harmonic and transient loads
− impact, crash
Analytical methods
• Analysis of stress concentration factors in anisotropic plates
• Calculation of anisotropic rotation-symmetric plates
• Failure mode based stress verification
Simulation of flow processes
• Injection moulding simulation
• Resin Transfer Moulding (RTM)
Specialisation
• Advanced topology optimization regarding different
restrictions like draw direction, extrusion path, symmetry;
aim: mass reduction, increasing stiffness
• Usage of custom-made interfaces for data processing via
MATLAB, Python, DIGIMAT, ESAComp, ComPoLyx, ANSYS
Composite PrepPost
• Coupling with non-destructive testing methods (CT-DAS)
• Crash and impact simulation using LS-DYNA
• Determination of damping properties of plastics
• Fluid-solid-coupling
• Vibro-Acoustics
Patents (Examples)
• DE 102009012578A1: Energieabsorptionselement für einen
Kraftwagen/Daimler AG. Bilgin, M.; Heinrich, M.; Kaufmann, J.;
Kroll, L.; Seidlitz, H. (05.11.2009).
• DE 102007055532A1: Sport- und Spielgerät/TU Chemnitz.
Kroll, L.; Heinrich, M.; Kaufmann, J. (28.05.2009).
Contact
Research Group
Computation, Simulation and Design (BSA)
Prof. Dr.-Ing. habil. Lothar Kroll
Reichenhainer Strasse 70, Room D130
09126 Chemnitz, Germany
Phone: +49(0)371/531-35706
E-mail: [email protected]
BSA-Team
Picture credits: SLK