LERTORA , Enrico

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The work reviews the state of the art of the use of bonded joints in shipbuilding, and describes motivations, features and results of an experimental research program aimed at characterizing actual performances attainable in bonded joints by use of several adhesives, currently available on the market, applied in realistic conditions. Joints...

The aim of this work is to investigate the Friction Stir Welding (FSW) process applicability to a typical aeronautical joint: the union of the stiffeners to sheets constituting the fuselage. To do this analysis FSW parameters of flat overlapped sheets were first identified by monitoring the temperature reached using thermography. 1.3 mm thick...

Increasing payload and fuel efficiency of aircrafts have become the major issues for the aerospace industry, which has increased the development of more advanced materials with highly specific properties. Low density aluminium lithium alloys are attractive to the aerospace industry since the structural weight reduction that they allow leads to...

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The joining of polymeric materials is a technology used in many industrial applications, from transport to telecommunications and the medical sector. A new technology for the joining of polymers is the laser welding process. In particular, fibre laser welding is a flexible technology which allows high process speed and the realization of good...

L'impiego di materiali polimerici rinforzati con fibra di carbonio è in crescita in molti settori industriali, dalle strutture civili all'industria dei trasporti, in particolar modo per la produzione di componenti aeronautici. Questo si deve ai loro molteplici vantaggi, quali elevata resistenza meccanica ed alla corrosione, capacità di poter...

Friction stir welding (FSW) is an innovative solid-state process, patented in 1991 by The Welding Institute, which avoids solidification problems associated with conventional fusion welding, providing joints having excellent mechanical and metallurgical properties. Due to its many advantages, FSW is successfully applied to weld various...

In this paper the behaviour of the plastic flow during Friction Stir Welding of AA7075 T651 plates, realized with different shaped tools, has been investigated. In particular, the influence of the shape of three tools was studied using copper strips placed along the welds. After welding, radiography and metallurgical analysis were used in order...

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For an effective application of polymers, it is essential to have good adhesion behaviour to ensure good mechanical properties and durable components. Unfortunately, in general terms, polymers are characterized by high chemical inertness, which leads to very low surface energy values and, consequently, poor adhesive properties; this is...

Le leghe di nichel rappresentano un gruppo di materiali molto particolare, caratterizzato da elevate qualità meccaniche e di resistenza alla corrosione. La capacità di mantenere inalterate tali caratteristiche, anche a temperature estremamente elevate, rende questi materiali idonei all'utilizzo nelle applicazioni più estreme. La saldatura delle...

This study reports a systematic investigation of the effects of various cold plasma treatment parameters on adhesion characteristics of two polyamide substrates. Polyamide 6 and polyamide 6.6 specimens were treated with a low pressure radio-frequency discharge plasma using different treatment time, power inputs and working gas (air, argon and...

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Fiber Reinforced Polymer (FRP) sandwich panels are increasing their application as structural and non-structural components in all kinds of construction. By varying the material and thickness of core and face sheets, it is possible to obtain sandwich structures with different properties and performance. In particular, their advantages as...

Gli adesivi presentano numerosi vantaggi, che possono essere ottimamente sfruttati nella costruzione e riparazione di navi e imbarcazioni di qualunque tipo.