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Tesi etd-06272019-171723


Thesis type
Tesi di dottorato di ricerca
Author
ALIOTTA, LAURA MARIA ANTONIETTA
URN
etd-06272019-171723
Title
Development of advanced composites with tailored strength and toughness.
Settore scientifico disciplinare
ING-IND/22
Corso di studi
INGEGNERIA INDUSTRIALE
Commissione
tutor Prof. Lazzeri, Andrea
controrelatore Prof. Cinelli, Patrizia
commissario Prof. Pukanszky, Bela
commissario Prof. Pegoretti, Alessandro
Parole chiave
  • Biocomposites
  • Toughness
  • Poly(lactic) acid
  • Interfacial Shear Strength.
Data inizio appello
05/07/2019;
Consultabilità
parziale
Data di rilascio
05/07/2022
Riassunto analitico
The main activity of these 3 years of PhD, is the evaluation of interfacial shear strength in biopolymer composites; analytical models were used to verify their applicability to this new class of materials. In many cases modifications at these analytical models were made to better taking into account the specific features of the reinforcement and of the polymeric matrix; in some cases, also micromechanical deformation processes were investigated.
Different types of biocomposites systems were studied. As a consequence, different preparation methodologies, experimental conditions, measurement methods were adopted during these three years of activities.
The evolution of the reinforcement as a function of aspect ratio was progressively studied; this aspect is fundamental because the evaluation of the IFSS and consequently the final mechanical properties are strongly influenced by the aspect ratio. Also the micromechanical deformation processes (debonding, fibers’ pull-out, cavitation, fiber breakage etc…) were investigated.
The activities of this PhD work can be divided into three sections:
1) Evaluation of interfacial shear strength (IFSS) of PLA/ PC blends containing cellulosic fibers having a relatively high aspect ratio (≃ 36).
2) Flax fibers characterization and evaluation of mechanical properties and IFSS of PLA-Flax composites containing short fibers (aspect ratio < 10).
3) Study of the rigid filler toughening mechanism in PLA-Calcium Carbonate composites (aspect ratio ≃1).
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