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Marangon, Christian (2014) Linear and non-linear structural analysis of notched components with local energy approaches. [Tesi di dottorato]

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Abstract (inglese)

In engineering practice, mechanical components are weakened by a wide range of sharp or blunt notches and their presence has to be accurately taken into account in the design. In fact near notches a strong stress gradient is always induced when a far field loading is applied.
Aiming to investigate the integrity of notched components subjected to different loading histories, for many years to nowadays a lot of stress and strain based damage criteria have been proposed. However, in the last years, some energy based criteria have been introduced and successfully applied on notched members proving to be powerful damage prediction tools.
In particular the averaged strain energy density criterion (Lazzarin and Zambardi 2001) has been developed and used in order to assess the strength of notched components with various notch geometries subjected to different types of loading.
The aim of this work is to extend the validity of the averaged SED criterion to the three-dimensional effects arising in the vicinity of a notch and to the problems induced by the application of multiaxial static and cyclic loadings.
Taking advantage of some results obtained from multiaxial cyclic analyses, the effect of the phase displacement between the applied loads has been addressed presenting a new proposal based on the maximum tangential stress averaged over an entire loading cycle.
Finally, a dedicated software based on the cyclic plasticity theory has been developed in order to obtain the stress/strain distributions at the tip of a rounded notch subjected to uniaxial and multiaxial low cycle fatigue. A particular link between the plastic hysteresis energy at the notch tip and the averaged SED has been found representing the first potential step for a future extension of the averaged SED criterion to cyclic plasticity.

Abstract (italiano)

Nella pratica ingegneristica, i componenti meccanici sono sovente indeboliti da discontinuità geometriche di diversa forma e dimensione, i quali devono essere tenuti in considerazione in fase di progettazione al fine di evitare malfunzionamenti o collassi strutturali.
Con l’obiettivo di valutare l’integrità strutturale di componenti indeboliti da intagli soggetti a sollecitazioni di diversa natura, numerosi criteri di cedimento sono stati sviluppati considerando lo stato di tensione e/o di deformazione all’apice dell’intaglio o nelle immediate vicinanze di quest’ultimo. Inoltre, negli ultimi anni, sono stati sviluppati approcci di tipo energetico, i quali hanno dimostrato un’ottima attitudine alla previsione del cedimento di componenti intagliati. In particolare, il criterio basato sulla densità di energia di deformazione (SED) mediata all’interno di un volume strutturale è stato presentato da Lazzarin e Zambardi (2001) al fine di valutare la resistenza di componenti intagliati soggetti a diverse sollecitazioni.
L’obiettivo del primo filone di ricerca di questa tesi è quello di estendere e validare il criterio SED considerando sia i modi accoppiati che si generano per effetto Poisson in componenti tridimensionali, sia problemi legati all’applicazione di sollecitazioni di modo misto e di fatica multiassiale.
Prendendo spunto da alcuni risultati ottenuti nel caso di sollecitazioni cicliche, il secondo filone di ricerca ha riguardato lo studio di una proposta in grado di discriminare l’effetto dello sfasamento tra le sollecitazioni su provini intagliati a spigolo vivo soggetti a fatica multiassiale.
Il terzo filone di ricerca ha riguardato l'implementazione di un software in grado di fornire le tensioni e le deformazioni elasto-plastiche all’apice di un intaglio raccordato sottoposto a fatica oligociclica. Infine, è stato possibile trovare un coefficiente di correlazione tra l'area del ciclo di isteresi all'apice dell'intaglio ed il valore della densità di energia di deformazione elasto-plastica all'interno di un volume strutturale.

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Tipo di EPrint:Tesi di dottorato
Relatore:Lazzarin, Paolo
Dottorato (corsi e scuole):Ciclo 26 > Scuole 26 > INGEGNERIA MECCATRONICA E DELL'INNOVAZIONE DEL PRODOTTO
Data di deposito della tesi:19 Gennaio 2014
Anno di Pubblicazione:19 Gennaio 2014
Parole chiave (italiano / inglese):meccanica della frattura/fracture mechanics, meccanismi di danneggiamento/damage mechanisms, fatica/fatigue, intagli/notches, plasticità/plasticity
Settori scientifico-disciplinari MIUR:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/14 Progettazione meccanica e costruzione di macchine
Struttura di riferimento:Dipartimenti > Dipartimento di Tecnica e Gestione dei Sistemi Industriali
Codice ID:6268
Depositato il:19 Mag 2015 17:38
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