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Tesi etd-10282020-162831


Tipo di tesi
Tesi di laurea magistrale
Autore
SANVENERO, SILVIO
URN
etd-10282020-162831
Titolo
Modeling and tuning strategies for high fidelity FE analyses of low velocity impacts on carbon-epoxy laminated plates
Dipartimento
INGEGNERIA CIVILE E INDUSTRIALE
Corso di studi
INGEGNERIA AEROSPAZIALE
Relatori
relatore Prof. Fanteria, Daniele
relatore Prof.ssa Boni, Luisa
correlatore Ing. Bovecchi, Federico
Parole chiave
  • Abaqus
  • CAI
  • Carbon-epoxy laminated plates
  • Compression after impact
  • Delaminations
  • FEM
  • Low velocity impacts
  • LVI
Data inizio appello
24/11/2020
Consultabilità
Non consultabile
Data di rilascio
24/11/2090
Riassunto
Carbon fiber reinforced polymers have excellent specific properties, but they present also new and not yet completely understood damaging processes. Delaminations, above all the damage mechanisms, is the most dangerous for the aerospace structures, because of their difficult detectability and the associated strength reduction, especially regarding compression strength. Indeed this is the dimensioning property for damage tolerance. The experimental campaigns are characterized by high costs, so the development of reliable numerical tools, capable of correctly modelling the onset and propagation of delaminations, is the key for lighter and safer structures. The purpose of this work is to expand the knowledge on innovative techniques for the simulation of delaminations. Moreover another aim is to correctly set the composite properties through ASTM standard tests such as DCB, ENF and ILSS to match the experimental impact tests. The interlaminar behavior is simulated using Abaqus cohesive elements and the models are generated via advanced Python scripts. Standard low velocity impact tests on multi-directional laminates are simulated and results in terms of forces and delaminated areas are assessed. Ultimately, it is shown that the adopted techniques well predict delaminations caused by impact events onset and their propagation.
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