Active Projects

Multi-scale modeling of single step manufac- turing of Metal - Polymer - Metal sandwich structures with fiber-reinforced core

Pranav Kumar Dileep

Present day composite materials find their application in most of the engineering fields due to their strength, weight and specific properties based on the application. This project particularly involves in the constitutive modeling of polymer material (PA6) with the help of thermo-mechanical experiments and mainly focuses on the validation of single step manufacturing of sandwich structures with fiber-reinforced core material through FE2 (Multi-scale) approach. Special emphasis is made for the development of this multi-scale numerical approach.

Material parameter identification using finite elements

 R. R. Gilbert

Inhomogeneous deformations in experimental tests of inelastic materials require the solution of the boundary-value problem by means of the finite element method. The application of the method of vertical lines in combination with least-square approaches yield clear concepts developed in Numerical Mathematics such as the simultaneous sensitivity analysis, internal and external numerical differentiation to obtain the sensitivities. Furthermore, the concept of identifiability has to be considered to find out whether the experiments are sufficient to address all material parameters.

Combining contact algorithm schemes with time-integration schemes

M. Grafenhorst

Boundary-value problems within practical problems are very often connected to contact conditions. Within this project, both 2D and 3D-mortar element contact schemes are combined with time-adaptive schemes using high-order diagonally implicit Runge-Kutta methods and high-order time-discretization schemes for dynamical problems to obtain more efficient implicit finite element computations.

Modeling and simulation of inhomogeneous fiber positioning in composite structures

A. Kheirimarghzar

Commonly, fiber reinforced composites are drilled to obtain holes for applying rivets to connect composite plates. The drilling process cuts the fibers. Alternatively, the fibers can be positioned around the hole in the production process. In this project, the experimental and numerical treatment of bypassing holes is investigated with regard to its applicability.

Experiments, modeling and simulation of curing processes in composite materials

Chris Leistner 

In this project various aspects of the curing behavior of a particular epoxy is studied. First, the shrinkage behavior is modeled. Second, the complextity of the curing evolution in respect of material parameter identification is addressed. For both goals, appropriate experiments have to be designed. Third, the difficulties in the temporal and spatial evolution using finite elements are treated using high-order time-integration schemes to overcome inherent instabilities in the curing evolution. Finally, an entire composite is studied with regard to its anisotropic chemo-thermomechanical behavior.

Experiments, modeling and computation of zinc die-cast material

 M. Martinez-Page

Frequently applied parts in industry are made of zinc die-cast. Since classical constitutive models cannot predict the thermo-mechanical structural behavior, mechanical experiment under varying thermal conditions are carried out as a basis for constitutive modeling. The model is implemented into a finite element program. Special emphasis is taken for thickness-dependence and ageing properties.

Micro-mechanical modeling Coupling of powder compaction multi-physical processes in the simulation of gas wells

J. Mohan

Energy storage is a topic of great interest in recent times owing to the fluctuating energy production mainly from wind and solar energy power plants. Another key aspect is the sustainable reduction of greenhouse gases produced from the non-renewable energy sources. There are different methods like Hydrogen storage, Power-to-Gas method, CO2 storage etc. by which energy could be stored in underground caverns and later utilized as per the energy demand. All these methods require the use of gas wells and their technical integrity has to be assured for economic viability and longevity. Simulation of these gas wells comprising of the gas well tubes, packers, cement, geological formations and the injected gas prove to be critical in determining their performance. The goal of the project is to develop an efficient coupling tool for different solvers used in the simulation of such multi-physical multiphase gas well models. The individual fields will be solved respectively with the help of in-house FEM code TasaFEM (thermo-mechanics), open sources codes like OpenFoam (fluid flow) and DuMux (porous medium flow) in a coupled manner. It is further envisaged to compare the results of the simulations to the experiments to be conducted at the Drilling-Simulator at Celle, Lower-Saxony, Germany and thereby have a comprehensive understanding with the help of theory, simulation and experiments of the gas well operation.

Theory and numerics of Additive Manufacturing Processes

L. Müller-Lohse

Additive manufacturing is an increasing field of producing parts in industry. The prediction of such parts and their internal material properties are very challenging, since the region of the material body changes, a solidification process happens, and multiphysical properties influence the resulting parts. This project serves for a fundamental study of the underlying issue of polymer parts.


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