Seminario “Instability, restabilization, and ultimate instability in a material”

Dettagli

Giovedì 27 novembre 2025 alle ore 10:00, nell'Aula 13 del Dipartimento di Ingegneria, Davide Bigoni (Instabilities Lab, Università di Trento) terrà un seminario dal titolo "Instability, restabilization, and ultimate instability in a material".

Abstract
Homogenization theory is applied to the design of materials capable of displaying unexpected behaviours. In particular, a simple model shows that for certain radial paths in stress space:

(i.) stability is always preserved;

(ii.) compaction, shear, and mixed-mode localization bands emerge;

(iii.) shear bands initially form, but later ellipticity is recovered, and finally, mixed-mode localization terminates the path.

Another, more sophisticated structural model is shown to exhibit ‘islands’ of instability emerging within a broad zone of stability. This unique feature leads to unexpected behaviour, where shear bands appear, vanish and reappear along radial stress paths originating from the unloaded state.

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