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Dr.-Ing. Mario Walter

mario walterWyn5∂kit edu

Telefon +49 721 608 23753

Mechanical Characterisation

Within the materials research the field of mechanical characterisation occupies a central position. Today, the importance of mechanical investigations goes far beyond the common determination of typical material parameter like for example E (young’s modulus), SU (tensile strength) and DBTT (ductile to brittle transition temperature) or also fracture mechanical parameters like KC (fracture toughness) and J (J-integral). Combined with micro structural investigations using different facilities (LM – light microscope, SEM – scanning electron microscope, FIB – focused ion beam microscope, TEM – transmission electron microscope) suitable mechanical tests in general allow to understand the physical background of the mechanical behaviour of materials under given conditions and thus, according to requirements, to modify/optimise existing materials or to develop new ones. Furthermore, results of mechanical experiments deliver input parameter for FEM calculations, existing material models and design codes, respectively, will be used to modify or develop new models – or also to validate design codes.

Based on different activities within the programme orientated research of HFG, the department owns several labs to investigate the mechanical behaviour of materials. Beside standard universal testing machines a multitude of special developed test set-ups, according to investigation-specific requirements, are available.


Depending on the type of experiment the machinery in operation allows investigations on specimens with different dimensions (cross sections with diameters from several µm up to several dm) under different load conditions (uniaxial, multiaxial; monotonic, cyclic, complex; statically, quasi statically, dynamically), and in different environments (air, vacuum, gas) within a wide range of temperature (-170°C up to 1600°C).






Long-term research projects:

Investigation of the isothermal low cycle fatigue behaviour of metallic structural materials for future fusion reactors

Investigation of the thermo-mechanical fatigue behaviour of ferritic-martensitic steels

Investigation of the deformation and failure behaviour of QUENCH-tested cladding tubes

Investigations to the influence of strain gradients on the mechanical behaviour of metallic materials in small dimensions

Influence of neutron irradiation on the mechanical behaviour of structural materials

Development of high temperature electrodeposited LIGA MEMS materials


Additional current research projects/sub-projects:

Fracture-mechanical characterization of Tungsten and Tungsten-alloys considering the influence of texture and loading rate

Investigations to the deformation, damage and failure behaviour of the ferritic-martensitic chrome steel EUROFER97 under thermo-mechanical cyclic loading

Investigations to the hardening behaviour of small structures under loadings where strain gradients occur