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Full-field measurements for the mechanics of micrometer-sized structures

le 18 février 2016

Fabien Amiot, chercheur CNRS au FEMTO-ST à Besançon, interviendra lors du séminaire du jeudi à l'ENS Cachan.

As micromachined commercial products with mechanical features today ex-
ploit only the integration capabilities microfabrication technologies allow (for
mass-production of reliable products), there is room for innovative products
making the most of micrometer-sized objects, which are very specific from the
mechanical point of view for two reasons:
Their surface/volume ratio is much larger than for the objects mechanical
engineers are used to deal with. The consequence is that strong surface
couplings have been evidenced, translating changes in the (electro-) chem-
ical environment into mechanical deformation.
The geometric margins (compared to the dimensions) and the material
homogeneity resulting from the usual processing techniques are very poor.
As a consequence, studying the mechanical behavior of micrometer-sized objects
requires to overcome two main barriers:
To identify material constitutive laws at the micrometer scale and to quan-
tify the role of the environment on the behavior;
To model chemo-mechanical couplings when materials are heterogeneous
and structures are poorly defined.
Moving forward along these two lines requires the development of a dedicated
instrumentation and the use of identification techniques suited both to the avail-
able experimental data and to the proposed mechanical descriptions. Few ex-
amples covering elastic and plastic characterization at the micrometer scale as
well as chemo-mechanical surface couplings will be detailed.
Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Amphi e-média
Bâtiment Léonard De Vinci - ENS Cachan
61, avenue du Président Wilson 94230 Cachan
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