Detecting bifurcations in 2D periodic metamaterials from images
Résumé
Architectured materials are often used for their high
strength-to-weight ratio. For this matter, they are designed with
high porosity which makes them sensitive to buckling under
compressive loading. This buckling is usually predicted by
numerical computations but very few experiments are available to
confront these numerical results. Experimentally, the onset of
instabilities is usually determined by following the global force
applied onto the sample. However, this detection might be hindered
by the presence of various defects which may locally trigger the
instabilities. A very simple technique is proposed herein to detect
instabilities in periodic architectured materials using standard
imaging techniques. It is shown to be applicable at a local scale,
thereby allowing for a local instability detection.
Domaines
Mécanique [physics]
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