Please use this identifier to cite or link to this item: http://elea.unisa.it:8080/xmlui/handle/10556/3023
Title: Aspetti fisico-matematici dei Materiali Auxetici con Memoria di Forma
Authors: Pugliese, Francesco
Scarpa, Roberto
Ciarletta, Michele
Tibullo, Vincenzo
Keywords: Materiali auxetici
Issue Date: 9-Apr-2018
Publisher: Universita degli studi di Salerno
Abstract: The Poisson coefficient, or Poisson’s Ratio, plays a fundamental role in the Continuum Mechanics theory, which represents the relationship between lateral contraction and longitudinal elongation of a material subjected to tensile stress; in almost all materials this coefficient, commonly indicated by the letter ! , has a positive value and very close to 1/3, for common materials used in construction, and to 1/2, for rubber materials. In auxetic materials this ratio takes on negative values, in fact the mentioned materials are often referred to by the acronym NPR (negative Poisson's ratio); this entails remarkable features such as high energy absorption capacity, fracture resistance, bending stiffness and shear strength and is due to the particular microscopic structure of the molecules. We will then see a modeling of these materials through the study of the fundamental cells that compose it and with different geometries of the microstructure (hexagonal chiral, rotation of polygons) which adequately describe the auxetic behavior. Moreover, from the study of the constitutive equations, we are faced with phenomena such as phase transitions and shape memory, which highlight further capacities of NPR materials; through the use of the fractional derivative a particular strain-strain relationship was analyzed, following by numerical simulations, which adequately reproduces what we call auxetic deformation. [edited by Author]
Description: 2016 - 2017
URI: http://hdl.handle.net/10556/3023
http://dx.doi.org/10.14273/unisa-1313
Appears in Collections:Matematica, Fisica ed Applicazioni

Files in This Item:
File Description SizeFormat 
tesi_di_dottorato_F_Pugliese.pdftesi di dottorato2,07 MBAdobe PDFView/Open
abstract_in_italiano_e_in_inglese_F_Pugliese.pdfabstract in italiano e in inglese a cura dell'autore124,14 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.