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Project

Microstructuur-gevoelige multiaxiale modellering van start en evolutie van vermoeiingsschade

There is a growing interest in predicting of various mechanical failure modes of infrastructures. The importance of managing ageing infrastructures has gained public’s interest in light of catastrophic incidents. Fatigue phenomenon is one of the complex mechanical failure mode, which occurs in combination of different influential parameters. The application of stress-based criteria for high cycle fatigue or plastic strain-based criteria for low cycle fatigue, which are widely used to assess fatigue fracture of industrial components, is typically based on transfer of results from tests on relatively small scale laboratory specimens to structural components.There are many research works in literature that focuses on estimation of fatigue damage initiation and evolution based macroscopic parameters calculated using the small scale laboratory experiments. However, fatigue fracture assessment at microstructure scale is a complex, evolutionary process with stages of crack initiation and propagation that highly depend on a hierarchy of microstructure features. Undue focus on one of these stages, i.e. fatigue damage initiation and evolution, form both academic and industrial perspectives is misleading, as the ration of total fatigue lifetimes linked to each portion of damage initiation and evolution highly depend on combination of different parameters such as microstructure, loading conditions, environmental conditions, stress/strain state and etc.The main objective of this research project is implementation of a predictive method in a finite element code in order to be able to simulate the fatigue fracture behaviour of structural components at the microscopic length scale. To do so, relations between different influential parameters and microstructure-scale response of materials are considered as a function of stress/strain amplitude and microstructure to support assessment of fatigue damage initiation and evolution.
Datum:1 okt 2018 →  30 sep 2020
Trefwoorden:fatigue damage
Disciplines:Materialenwetenschappen en -techniek