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EUROMECH 505
The
pioneering
mechanical models dedicated to the metals fatigue under cyclic
loadings were macroscopic. Today, it is well accepted that the
mechanisms underlying crack initiation start at the scale of
dislocations. In the last two decades, researches have attempted to
extend the experimental basis in this sense and to introduce this
view in the modelling.
The
experimental objective was to obtain information at the relevant
scales (dislocations structures, slip bands, grains…) by
using
complementary leading edge techniques: Transmission Electron
Microscopy, Scanning Electron Microscopy with Electron Back-Scattered
Diffraction, Atomic Force Microscopy, etc.
The theoretical and computational objectives were to compare and integrate observations in multiscale physically based models, as polycrystalline aggregates calculation or Discrete Dislocation Dynamics simulations. From the engineering point of view, there were some attempts to include these works in state-of-the-art fatigue predictions on structures but further effort should be provided in order to use these models on a day to day basis.
As a consequence, most of the recent developments are realized at the border between the communities of metallurgy, theoretical mechanics and mechanical engineering.
The purpose of the colloquium is to organise a meeting where these communities of matirials, theoretical mechanics and mechanical engineering can exchange state-of-the-art modelling and results on the multiscale mechanisms and mechanics in fatigue of metals. We expect that this cooperation should lead to openings of new complementary research fields, intimately coupling theoretical and numerical tools with new experimental resources. The topics discussed during the colloquim are:
The application of these models and techniques will be illustrated on different fatigue contexts: isothermal or non-isothermal, uniaxial or multiaxial loadings, contact and/or fretting fatigue, constant or variable amplitude loadings. Within the topics, a special attention will be accorded to complex cyclic loadings as well as to new metallic materials and/or structures.
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