1,721,186 research outputs found
Un nuovo metodo per la generazione automatica diretta delle funzioni di forma per elementi serendipity rettangolari
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Analisi con modelli tridimensionali del contatto non lineare, fra anelli di supporto dei circuiti poloidali, e volta toroidale della macchina RFX
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A non-linear stress-strain relation endowed with fractional derivative elements
Full text linkIn this paper a non-linear stress-strain relation based on an integral formulation with a power-law kernel is proposed. This constitutive law is able to reproduce both the viscoelastic behavior and the inelastic irreversible phenomenon. It is shown how the proposed stress-strain law is capable to fit experimental data obtained from tensile tests on two kind of metal alloys. Such best-fitting procedure have shown the accuracy of the proposed model and its results are compared to other ones obtained with the aid of classical non-linear constitutive law
An Innovative study of the debonding process for adhesively bonded interfaces under different loading conditions
No full textThe prediction of the interfacial failure mechanisms for adhesively bonded joints and composite structures is a well-known issue that has been studied both theoretically and/or numerically [1,2]. Small loads usually leave an adhesive junction bonded, where a jump of displacements is allowed due to the compliance of the interface. An increasing load, instead, can lead to adhesive breaks in one or more interface points where a crack starts and propagates along the interface, up to the complete detachment of the adherends.
This work focuses on the development of a new theoretical approach to determine the debonding onset and propagation along weak interfaces under different loading conditions. The interfacial problem is addressed by means of the cohesive crack modeling, assuming a linear- elastic behavior for the adherends and concentrating all non-linearities at the interface. This means that interfaces are considered as an assemblage of two sublaminates partly bonded together by an elastic interface. Such interface can be modeled as a continuous distribution of elastic springs acting along the normal and/or tangential direction depending on the interfacial loading condition. This generalizes the idea suggested recently in [3] for a single mode-I debonding.
The analytical predictions of crack advancement, length of the process zone, maximum load and load-deflection response, are compared to the numerical results as provided by a simple node- to-segment contact formulation. This is here generalized to handle cohesive forces along the normal and tangential directions, as employed in [4]. The very good agreement between analytical and numerical results confirms the accuracy of the theoretical proposed formulation
I tunnel artificiali: una soluzione innovativa per attraversare antiche strade romane
No full textI tunnel artificiali richiedono una delicata progettazione e una accurata costruzione, consentono di bypassare importanti infrastrutture recando il minimo disturbo. Trovano largo impiego in ambito ferroviario ma una recente applicazione, avvenuta a Taranto, ha consentito di evidenziare le potenzialità di queste opere grazie all'attraversamento di un'antica strada romana.
In questo articolo si propone un focus sulla programmazione del varo e la procedura di calcolo del muro reggispinta
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