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Zappalorto, Michele (2009) Nocht mechanics under elastic and elastic-plastic conditions. [Ph.D. thesis]

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Abstract (english)

Deliberately created or inadvertently induced, notches and defects unavoidably exist in engineering components. Then, fatigue strength assessments often need linear and nonlinear stresses and strains at the notch root or in the close neighbourhood of it.
Whilst there is a large body of work on notch root stresses under tensile loading, in the previous literature there has been relatively little attention paid to torsional loading of prismatic shafts. Nevertheless, the engineering use of torque carrying shafts is extensive and they are susceptible to crack formation at notches and grooves under both static and cyclic conditions.
In this work, a comprehensive evaluation of the components of the linear and non-linear stress fields ahead various kind of mode III loaded notches is presented.
These expressions are also used to provide closed form solutions for some local parameters such as the averaged strain energy density and Rice J-integral.
Finally an assessment of fatigue strength of welded joints subjected to multiaxial loading (combined Mode I and Mode III) as well as to complex three-dimensional welded joints based on the local energy is presented.

Abstract (italian)

Variazioni geometriche, come fori e intagli, sono comunemente presenti nella maggior parte dei componenti meccanici. Tali discontinuità, causa di una perturbazione della distribuzione di tensione nominale, comportano un aumento locale delle tensioni e delle deformazioni. La conoscenza delle distribuzioni di tensione nelle adiacenze di tali variazioni geometriche è quindi di grande importanza nella valutazione della resistenza a fatica di componenti strutturali.
Mentre in letteratura vi sono numerose soluzioni teoriche per componenti piani soggetti a trazione o flessione, relativamente pochi sono i contributi relativi a casi di torsione in travi prismatiche o assialsimmetriche. Tuttavia, gli alberi soggetti a coppia torcente rappresentano un caso di notevole interesse applicativo, essendo potenzialmente interessati da fenomeni di innesco e propagazione di cricche di fatica dovute a effetti di intaglio di diverso tipo.
Il lavoro riporta delle soluzioni analitiche in forma chiusa per le distribuzioni di tensione generate da intagli circonferenziali in componenti assialsimmetrici soggetti a torsione, in condizioni lineari elastiche ed elastoplastiche.
Tali soluzioni sono inoltre utilizzate per determinare delle espressioni in forma chiusa per alcuni parametri locali, quali la densità di energia di deformazione e il J-integral di Rice, e per discutere dal punto di vista teorico alcuni aspetti peculiari relativi all’effetto d’intaglio in presenza di sollecitazioni torsionali.
Viene infine proposta una sintesi di un elevato numero di risultati sperimentali, tratti dalla letteratura, relativi a giunzioni saldate tridimensionali soggetti a fatica monoassiale (trazione o flessione) e multiassiale (Modo I e Modo III combinati) in termini di densità di energia di deformazione.

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EPrint type:Ph.D. thesis
Tutor:Lazzarin, Paolo
Ph.D. course:Ciclo 21 > Scuole per il 21simo ciclo > INGEGNERIA INDUSTRIALE > PROGETTAZIONE MECCANICA E INGEGNERIA MOTOCICLISTICA
Data di deposito della tesi:22 January 2009
Anno di Pubblicazione:2009
Key Words:Notch, Stress distribution, strain energy density, Mode III
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:1365
Depositato il:22 Jan 2009
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