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Research field Experimental and Numerical Methods

‘Rumpling’ of metallic coating in thermal mechanical fatigue testing

The demand for shorter development times for new components and technical units requires accelerated and accurate determination of material properties. By combining experimental and numerical methods it is possible to reduce the number of time consuming experiments without loss of accuracy and reliability of the obtained data. In order to exploit the potential of materials in service an improved knowledge of their damage and failure behaviour is essential. For example, the utilization of new hybrid materials and components made from different classes of materials with joints between polymers and metals or in metallic-ceramic coating systems depends substantially on the reliability and accuracy of the lifetime assessment for service conditions. Higher reliability with simultaneously reduced effort can be only achieved with improved or new methods, which combine experimental testing, microscopic analyses, and physical modelling and simulation.

Ongoing topics:

• Close-to-reality testing of materials for aeroengines
• Methods for time economic lifetime assessment (acceleration of thermo mechanical tests, monitoring of damage parameters)
• Methods for determining material properties, amongst others for coatings
• Modelling of the behaviour of materials and material transitions under thermal and mechanical loading

Simulation of amplitude change of ‘rumples’ after 24 thermal mechanical load cycles

Topics under development:

• Implementation of mathematical optimization into design and development of new materials and components
• Hybrid experimental-numerical methods for efficient determination of materials data

Research and development is carried out in close cooperation with the departments of the DLR Institutes of Materials Research and Structures and Design and with partners from industry, small and medium sized enterprises, research centers and universities.

Offerings:

• Consulting
• Collaboration in joint research and development projects
• Contract research

Promotion of young researchers, Supervision of Bachelor-, Master- and PhD-work, advanced post-doctoral training

Projects:

Modelling and simulation of TiAl-Materials, joint project with industrial partner Development and validation of Softwaretools for evaluation and optimization of highly loaded Materials, BMBF-joint project ‚OPTIMAT’ in the frame of the WING-programm Interaction between time- and number-of-cycle-dependent damage mechanisms in high temperature materials, joint project ‚INTERACTION’, German Science Foundation (DFG) and National Science Foundation of the USA, ‚Materials World Network’