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Light Metals

Holistic development and characterization of an efficient manufacturing of detachable joints for aluminium and magnesium lightweight materials

Duration: 2015 until 2021 Project partner: Institut für spanende Fertigung Sponsor: Deutsche Forschungsgesellschaft (DFG)
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The aim of the research project includes the holistic development, characterization and optimization of an innovative friction drilling process with subsequent thread manufacturing in aluminium and magnesium alloys. Especially the model based correlations of the process-structure-property-relations are to be investigated. The process related geometrical and microstructural properties of internal threads are correlated with the mechanical properties, whereby a structure-based analysis of the damage mechanisms leads to a comprehension of an optimal process parameter designing.

For further information, please refer to:
M.Sc. Yashar Sarafraz

 


 

Development and validation of an in vitro short-time testing method for the prediction of the in vivo behavior of absorbable metallic implant materials

Duration: 2018 until 2021 Project partner: Hochschule Osnabrück Sponsor: Deutsche Forschungsgesellschaft (DFG)
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Bioresorbable magnesium implants are considered as promising biomaterials of the future in the surgery. In vitro testing for qualification of magnesium materials as biomaterials is a big challenge, because the material behavior has to be predicted for a long period of time. There is a generally great demand for qualification of materials for application as bioresorbable implants without referring to animal experiments. The aim of the project is the development of a short-term corrosion fatigue testing method with which the material behavior using the example of the magnesium alloy WE43 MEO in the human body can be estimated time accelerated as well as in vitro.

For further information, please refer to:
M.Sc. Nils Wegner

 


 

Identification and modeling of fatigue damage mechanisms in Al-Si-Mg cast alloys under fatigue loading at high and very high number of cycles

Duration: 2016 until 2020 Project partner:

Hochschule Osnabrück

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Sponsor: Deutsche Forschungsgesellschaft (DFG)
Al-Si-Mg

The adaptability and the development of aluminum casting alloys for highly stressed components in mechanical engineering, automotive and energy technology requires reliable and quantitative knowledge of the context between the material microstructure and the associated fatigue properties. This research project will modulate the microstructural parameters and fatigue strength, based on specific solidified model alloys and commercial material samples of the system Al-Si-Mg. It will also enable the identification of fatigue damage mechanisms at the microstructural level and lead to a proper implementation of these mechanisms in a physically-based short crack model.

For further information, please refer to:
M.Sc. Jochen Tenkamp

 


 

Mechanism-oriented characterization of the load direction-dependent cyclic creep (ratcheting) behavior of the magnesium alloys Mg-4Al-2Ba-2Ca and AE42

Duration: 2017 until 2019     Sponsor: Deutsche Forschungsgesellschaft (DFG)
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The aim of the project is the characterization of the cyclic creep behavior of the creep resistant magnesium alloys Mg-4Al-2Ba-2Ca and AE42 and the model-based correlation of the deformation and damage mechanisms depending on load direction and temperature. The scientific goal is the model-based correlation between the microstructure and the fatigue tests, to show the dependencies of the cyclic creep behavior on load direction, temperature and microstructure. Load-dependent differences in material behavior at cyclic stresses with superimposed static load amounts are to be investigated in single- and multi-step fatigue tests at load directions in tensile and compressive mode. The determined correlations shall be used for the estimation of the remaining lifetime and for a condition-monitoring-concept.

For further information, please refer to:
M.Sc. Alexander Koch