Tancredi, Simone (2011) Experimental and numerical studies on low velocity impacts detection and damage identification in metal and composite structures using ultrasonic waves propagation (Lamb waves). [Tesi di dottorato] (Unpublished)

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Item Type: Tesi di dottorato
Language: English
Title: Experimental and numerical studies on low velocity impacts detection and damage identification in metal and composite structures using ultrasonic waves propagation (Lamb waves)
Creators:
CreatorsEmail
Tancredi, Simonesimone.tancredi@unina.it
Date: 30 November 2011
Number of Pages: 81
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria aerospaziale
Doctoral School: Ingegneria industriale
PHD name: Ingegneria aerospaziale, navale e della qualità
PHD cycle: 24
PHD Coordinator:
nameemail
Moccia, Antonioantonio.moccia@unina.it
Tutor:
nameemail
Ricci, Fabriziofabricci@unina.it
Date: 30 November 2011
Number of Pages: 81
Uncontrolled Keywords: Structural Health Monitoring; Lamb Waves; Low velocity impacts; piezoelectric wafer active sensors; pwas; nondestructive evaluation; nde; shm; phased array; explicit fem codes
MIUR S.S.D.: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/05 - Impianti e sistemi aerospaziali
Area 09 - Ingegneria industriale e dell'informazione > ING-IND/04 - Costruzioni e strutture aerospaziali
Date Deposited: 09 Dec 2011 15:05
Last Modified: 30 Apr 2014 19:49
URI: http://www.fedoa.unina.it/id/eprint/8911

Abstract

In this thesis a theoretical base required for the development of a reliable structural health monitoring system based on ultrasonic guided waves is considered. An exact theory is used for relatively rapid calculation of the PZT driven surface motion in a plate recorded in an ultrasonic experiment. The theoretical results are compared with those obtained from an explicit finite element code for their mutual verification, showing excellent agreement. Important characteristics of the ultrasonic signals recorded by the PZT patches in an experiment are carefully extracted and modeled to identify the behavior of the PZT patches used in the experiment. Some applications are presented mainly concerning composite plates subjected to low velocity impact damage or more general hidden defects. Finally an application to the beam forming technique is presented.

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