Corso Dottorato - Residual Strength of Low Velocity Impact Damaged Composite Structures

Il corso avrà inizio martedì 7 novembre 2017 e si articolerà in quattro lezioni, della durata di quattro ore e trenta minuti ciascuna, secondo il seguente calendario:

• Martedì 7 novembre 2017 8:30 13:00
• Mercoledì 8 novembre 2017 8:30 13:00
• Martedì 14 novembre 2017 8:30 13:00
• Mercoledì 15 novembre 2017 8:30 13:00

Le lezioni si terranno presso l’Aula Malquori a P.le V. Tecchio. Possibili cambiamenti di aula, in dipendenza del numero dei partecipanti, verrà comunicato tempestivamente.

il Corso, pensato per gli studenti che frequentano il corso di Dottorato, presenta argomenti che sono di interesse per gli studenti del Corso di Laurea Magistrale in Progettazione e Produzione e possono essere certificati come Ulteriori Conoscenze 3 CFU nell’ambito del percorso di studio.

Per motivi organizzativi, i dottorandi interessati a partecipare sono invitati ad inoltrare un cortese cenno di adesione al Prof. Enrico Armentani (enrico.armentani@unina.it) e/o al Dr. Alessandro De Luca (alessandro.deluca@unicampania.it).

Presentation
Fibre-reinforced composite materials have found increasing industrial applications in the last decades, especially in the aerospace and transport fields, due to their high specific strength. However, even though this property allows having a lightweight and strong structure, some negative aspects still limit their use. Most of these depend on several types of undetectable defects and damages, which could affect the residual strength of the composite structures.
Among such damages, some can be due to the Low Velocity Impact (LVI) phenomena, which are accidental/in-service loads, such as a tool dropping or, runway debris, which is projected against the fuselage during either tacking off or landing phase. The related damages consist of delaminations, perforations, debonding between fibres and matrix, etc. Such damages must be tolerated in the structure under in-service loading conditions. Such defects and damages can result in catastrophic failures if not detected and handled in time.
The proposed course discusses the problems associated with the LVI phenomena on composite laminate. Most of the attention will be focused on numerical models for the simulation of such phenomena, on the assessment of the residual strength of impacted components and, finally, on Lamb wave based Structural Health Monitoring (SHM) systems aimed to LVI damages detection.

Contents
First Day: 07/11/2017

• Introduction to Low Velocity Impact (LVI) phenomena;
• Damages involving composite laminates;
• Numerical models for the prediction of both first failure and delamination area involving composite laminate under LVI phenomena.

Second day: 08/11/2017

• Finite element (FE) method for the simulation of LVI phenomenon;
• Damage modelling techniques according to FE method;
• Global-Local approach for the modelling of both intra-laminar and inter-laminar damages;
• Practice exercise.

Third day: 14/11/2017

• Compression After Impact (CAI) test for the residual strength assessment;
• CAI test simulation by means of quasi-static analysis;
• Practice exercise.

Fourth day: 15/11/2017

• Structural Health Monitoring (SHM) System based on Lamb wave propagation;
• Lamb waves theory;
• Damage Index;
• Numerical models for the prediction of Lamb wave propagation.
• (Final test)