Thesis in multiscale modelling of the forming process of thermo-plastic fibre reinforced composites (TPFRCs)

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1 Thesis in multiscale modelling of the forming process of thermo-plastic fibre reinforced composites (TPFRCs) TPFRCs are fundamentally well suited for the application in lightweight (vehicle) construction. Achieving a high process stability is demanding due to the formation of multiscale residual stresses. Project goal: Efficient, scale-bridging simulation tool for the thermoforming process of TPFRCs. BMW 7 series Part scale Textile scale e.g. side impact protection Fibre & Matrix scale [BMW AG] [Spriform] [Compositeworld] [N. Haque et al.] Theses (Bachelor or Master) concerning the following topics can be arranged individually: Multiscale material modelling (Fortran or/and Matlab) Experimental testing of TP and TPFRC specimens and determination of material parameters Finite Element simulations with Abaqus Contact: sebastian.felder@rwth-aachen.de

2 Master s Thesis in Micro Modelling of Paperboard Macro appearance The goal is to predict the macro-mechanical properties of paperboard using micro-scale modelling. Wikipedia Possible topics include: Micro geometry Micro modelling 200 image base microstructure analysis (microscopy and CT data) fiber length, diameter and orientation distribution identification representative volume element generation modelling of fibers and interfiber bond experimental validation Contact: jaan.simon@rwth-aachen.de

3 Master s and Bachelor s Thesis in Modelling of shear cutting of Carbon Fiber Reinforced Plastics (CFRP) It is predicted that CFRP will play an important role in upcoming automobile generations, since lightweight is a key aspect for both electrical and conventional cars. However, high manufacturing and processing costs prevent CFRP from being extensively available for mass production. To reduce the processing costs, it is considered to substitute milling and drilling by shear cutting. The main goals of this project are: Simulation of the cutting process by using a new material approach Validate the simulations with experimental results Shirobokov et al. [2015] Provide a simulation toolset of shear cutting within Abaqus framework Contact: Lukas.Poggenpohl@ifam.rwth-aachen.de

4 Master s Thesis in Parameter Optimization A cohesive element formulation intended for the design of the sandwich panels of NASA s new space launch system (SLS) has been developed at IFAM. Since the code is very efficient, it permits coupon level simulations in about 10 seconds. This makes the formulation highly suitable for automated parameter optimization. Possible topics include: literature survey of optimization strategies development of suitable optimization criteria / objective functions implementation and comparison of optimization strategies sensitivity analysis Contact: daniel.hoewer@rwth-aachen.de

5 Master s Thesis in CFRP Manufacturing and Modelling Carbon fiber reinforced plastics (CFRP) are the most important material for many lightweight constructions such as planes, cars and wind turbines. The material parameters related to fracture are particularly interesting for designing safely without excessive safety factors. While these parameters are well-understood in the case of solid laminates, there are still a lot of open questions concerning these parameters for (honeycomb) sandwich constructions like the cargo fairing of NASA s space launch system (SLS). Possible topics include: fabrication and testing of CFRP specimen determination of the fracture-related material parameters comparison to existing FE models Contact: daniel.hoewer@rwth-aachen.de

6 Master s Thesis in CFRP Modelling Multiscale Fracture Carbon fiber reinforced plastics (CFRP) are the most important material for many lightweight constructions such as planes. Advanced applications such as crash require multiscale approaches that account for the microscale response of the material in order to predict the correct structural response. Possible topics include: improvement of an existing microscale damage code investigation of suitable path-independent homogenization schemes comparison to existing FE models Contact: daniel.hoewer@rwth-aachen.de

7 Master s Thesis in Adhesive Modelling Glass-Façade Construction Foto: Christoph Seelbach Fotografie / Saint-Gobain Glass Displacement of a glass-façade element Adhesives have been used for a long time in construction. However, one critical issue is the uncertainty due to the lack of a consistent design method for glass-façadeconstructions using an adhesive connection between metal and glass. Possible topics include: Investigate hyperelastic material (silicone adhesive: GD920) Extend a material model Consider damage (Mullins Effect) Adhesive layer Validate the established material model Contact: elisabeth.toups@rwth-aachen.de

8 Master s Thesis in Modelling of Asphalt Concrete Asphalt Concrete is one of the oldest man-made composite construction materials. You can contribute to an in-house virtual lab in numerous ways: source:dpa Investigate sensitivity of homogenised properties on material and geometry parameters Improve meshing Compare predictions of numerical to analytical homogenisation techniques Contact: jneumann@ifam.rwth-aachen.de

9 Master s Thesis in Model Order Reduction on Substructures The goal of the project is to apply nonlinear Model Order Reduction to typical substructures to simplify the design process of modular shell structures. structural members real building aidomes.com reduction of substructures as basic structural components flexible coupling possibilities application and numerical investigation substructures FEM with MOR Contact: lei.zhou@rwth-aachen.de

10 Master s Thesis in Model Order Reduction on Substructures MOR on substructures can reduce the large dimension of the equation system, by reducing each part individually. The Galerkin projection applied on each substructure is still a time consuming process, which can be accelerated through parallel computation to achieve further efficiency. Illustration of parallelization combined with MOR on substructures: requirements: basic knowledge of FEM advanced knowledge of Fortran experience in parallelization (MPI or OpenMP) A finite element model in FEAP (each thread) Contact: lei.zhou@rwth-aachen.de

11 Master thesis Integration of a 3D-discontinuous Galerkin (DG) method with solid and solid shell elements applying finite element technology Discontinuous Galerkin (DG) method is an alternative for the standard finite element methods, where the occurrence of discontinuities between elements are permitted. In this master thesis, an already existing 3D-DG model is to be integrated with special solid and solid shell elements properly. This work is aimed at application of the locking-free solid element Q1SP and the solid shell element Q1STs in the DG framework and rectification of the existing errors. The main goal is to improve the locking behavior. You are: a master student of Mechanical/Civil Engineering or related experienced and interested in programming (Fortran, MATLAB, FEAP ) are holding good marks in FEM & Continuum Mechanics independent and interested in research. Contact us and send your CV and your transcript! Telephone: Contact: hamid.reza.bayat@rwth-aachen.de

12 Master s Thesis in Mica Insulation Systems Modelling Generator Mica insulation have been employed for the insulation of electrical generators. Due to a new energy law the new energy utilization occurs crack initiation in the current insulation system. To improve the understanding of degradation (crack initiation and propagation) a related simulation model for life time prediction is to develop. Insulation Possible topics include: Developing a suitable unit cell with the geometry of the current insulation system Investigating different geometries of the unit cell determination of the fracture-related material parameters Microstructure Kraftwerkforschung.info Contact: thank.thank.nguyen@rwth-aachen.de

13 Master/Bachelor s Thesis in Model Order Reduction (MOR) Possible topics: - How to handle nonlinearities in combination with MOR? - Implement a new a priori method without using existing snapshots with an adaptive (Projection matrix) FEM is used in many different fields nowadays. Most calculations are very expensive. The goal of the project is to speed up the simulations and make them cheaper without loosing too much accuracy. - Using new approximations for MOR - Combining the existing models with new mathematical approaches MOR Contact: steffen.kastian@rwth-aachen.de

14 Master s Thesis in Gradient-Extended Damage Modeling F X-ray microtomography Motivation: conventional damage material models are usually not able to properly describe strain localization processes in materials results of finite element (FE) computations depend strongly on the chosen mesh-size Landron et al FE damage simulation Goals: to study so-called gradient-extended damage models which can cure the aforementioned problem F to set-up and carry out various FE computations in order to investigate the properties of these enhanced models Contact: tim.brepols@rwth-aachen.de

15 Master s Thesis in Material modeling of nozzle structures Nozzle extension made of ceramic matrix composite Nozzle structures made of ceramic matrix composites exhibit: lower weight with higher stiffness at the same time much higher service temperatures than conventional copper alloy nozzle structures. The goal of the project is to develop an efficient model for nozzle structures made of ceramic matrix composites (CMCs). DLR Stuttgart Theses concerning the following topics are possible and can be arranged individually: Material modeling in Fortran and/or Matlab Finite element technology for thin structures Finite element simulations with FEAP and Abaqus Ariane 5 ESA Microstructure of the material Contact: oliver.barfusz@rwth-aachen.de

16 Master s Thesis in Modeling of Anisotropic Damage Motivation: modeling damage as isotropic is too simple the phenomenon of damage is in its nature anisotropic and should be therefore also modeled anisotropic (e.g. with a 2nd-order damage tensor) Goals: study of numerical examples in order to investigate the differences between isotropic and anisotropic damage models improve/extend the existing anisotropic damage model use a nonlocal formulation in order to obtain mesh-independent results in FE simulations Contact: marek.fassin@rwth-aachen.de

17 Master s Thesis on Thermal Buckling simulation Thermal buckling can occur in aerothermodynamically loaded thin-walled structures. The goal of this project is to provide a computational model which takes thermo-viscoplasticity effects and thermomechanical coupling into account. experiment Flow line [Niesner 2009] Possible topics include u q Shocks Including radiation in the model Finite Element Technologies for thin structures Panel mounting Simulations for fluid-structure interaction Panel Deformed Undeformed Effect of buckling on the flow Contact: katharina.martin@rwth-aachen.de

18 SFB/TRR 136 Master s Thesis in Computational Material Modeling Scielo.br aim phase-field modeling of martensitic phase transformations in 42CrMo4 steel based on experimental data steps review on material models for 42CrMo4 parameter identification/fitting phase-field simulation comparison between experimental and numerical results YOU! Wikimedia simulations EBSD data, material parameters, stress-strain curves, experiment simulation Contact: julian.kochmann@rwth-aachen.de

19 Master s Thesis: Failure in nano-layered coatings [phys.org] [ [siemens.com] Do you find fracture behavior and damage inside the materials interesting? Does studying the coating layers in high-tech engineering equipment fascinate you? indenter crack propagation Do you want to expand your knowledge in numerical modeling? then I have a unique offer for you Contact: shahed.rezaei@rwth-aachen.de

20 Master s Thesis in Modelling of Roll Bonding of Alloys with Thermomechanical Coupling The goal is to study the bonding behaviour of alloys with the cohesive zone element (CZE) Both bonding and debonding are simulated using CZE Interplay of plasticity and thermomechanical coupling Li et al Experimental validation and prediction heraeus.com Contact: khaledi@ifam.rwth-aachen.de

21 Master s Thesis in Small Scale Crystal Plasticity The goal of the project is the development of computational methods for crystal microscale plasticity theories and their verification by analytical solutions. Steps: Dimiduk 2005 Review on small scale crystal theories Finite element simulation with geometricaland material nonlinearity (Fortran) Application of the FE simulation to the small scale gradient plasticity problems (FEAP/Fortran) Wulfinghoff et al Contact: alipour@ifam.rwth-aachen.de