Towards design of dissipative metamaterials: formulation and identification of symmetric and asymmetric hysteretic materials
On April 16, 2024 from 11:00 to 13:00 at the Melis Hall (S1b) of the Santa Chiara Complex will be held the lecture Towards design of dissipative metamaterials: formulation and identification of symmetric and asymmetric hysteretic materials by Salvatore Sessa (University of Naples Federico II).
Abstract:
Within the context of nonlinear analysis of structural
systems presenting hysteretic phenomena, a class of phenomenological
constitutive models has been recently presented and extended to asymmetric
loops with softening and hardening behaviour.
Compared to models having similar behaviours, such classes
are significantly more efficient being capable of providing closed form
responses without using iterative procedures nor differential relationships.
Nevertheless, because of their phenomenological characterization, their
parameters need to be properly calibrated by matching experimental hysteresis
loops. Parameter identification turns out to be particularly complex in the
case of the asymmetric case since they cannot be directly related to physical properties
of the experimental response.
The present presentation investigates an identification
procedure based on the optimization of least-square residuals defined in terms
of response amplitude and stiffness.
Short bio:
Salvatore Sessa is associate professor at the university of
Naples Federico II were he got a master degree in Civil Engineering and a PhD
in Engineering of Material and Structures. During his PhD course he spent a
18-months appointment as visiting scholar at the University of California, and
developed research activities on random vibration analysis of nonlinear systems
with asymmetric hysteresis.
After graduation, he worked as postdoc at the University of
Naples Parthenope and at the Politecnico di Milano where he researched cohesive
fracture and mechanical identification of bonded interfaces. Since 2016, he has
been working at the University of Naples Federico II as Assistant Professor and
therefore as Associate Professor.
He is author of more than 20 scientific papers published in
international journals and his research interests include computational
mechanics of solids and structures with particular focus on the identification
of nonlinear systems. Recently, his activities investigated quasi-brittle
fracture of continuum by strain-gradient models.
Microsoft Teams code and link: GNprHY – https://bit.ly/3VrqQV8.
Prof. Salvatore Sessa while giving the seminar