0000000000069080
AUTHOR
Giuseppe Di Franco
Influence of the distance between rivets in self-piercing riveting bonded joints made of carbon fiber panels and AA2024 blanks
Abstract The increasing use of new materials alternative to steel in manufacturing industry has led to a greater emphasis on the improvement and the development of specific joining approaches allowing to get effective mechanical properties even when different materials are joined together. It should be observed that often the traditional welding techniques show several limitations as aluminum or magnesium alloys are used, and, what is more, they are not compatible with composite materials. The development of structures made of these materials has renewed the use of mechanical fastening operations. The present paper investigates the influence of the distance between rivets in self-piercing r…
Studio sperimentale di giunti ibridi CFRP-alluminio
Ottimizzazione di Giunti Ibridi(Spr/Incollati) Gfrp-Al
Analysis of the accuracy of fiber-optic strain transducers installed by using composite smart patches
The aim of this work is to investigate the accuracy of fiber-optic strain transducer related to the incomplete load transmission that can occur on composite smart patches used as base support for the installation of such transducer, commonly used for structural monitoring of concrete elements. In detail, since the dimensions of the transducer are generally very small compared to those of the structural element being monitored, attention is given not to the global reinforcement effect, which occurs when the transducer alters the entire strain field of the transversal section of the monitored element, but rather to the so-called local reinforcement effect, which is due to an incomplete load …
Fatigue behaviour of self-piercing riveting of aluminium blanks and carbon fibre composite panels
In this article, the fatigue behaviour of self-piercing riveted joints in 2024-T6 aluminium sheets and carbon fibre composite panels is studied through experimental tests and numerical simulations. This study, aimed to evaluate the best process conditions and the mechanical behaviour of the joint itself, can be divided into few phases: the first one in which the static mechanical behaviour was investigated in order to evaluate the best process conditions (such as the best value of oil pressure of the riveting system) and the second one which had the purpose to determine the fatigue behaviour of the joint. Finally, a finite element method analysis of the riveting process was developed in or…
Influence of parameters in a hybrid joint (SPR/bonded) GFRP-aluminum
ANALISI NUMERICO-SPERIMENTALE SUL COMPORTAMENTO A FATICA DI COMPOSITI CARALL RIVETTATI
Nel lavoro è descritto un modello di danneggiamento per provini CARALL (CArbon Reinforced ALLuminium), rivettati e non rivettati, sottoposti a prove di fatica mediante flessione pulsatoria a tre punti in controllo di spostamento. I provini sono realizzati sovrapponendo 8 lamine di tessuto intrecciato di carbonio [0°/90°] e resina epossidica con interposta una lamina in lega di alluminio 6061-T6 dello spessore di 0.8mm. Le prove sono state condotte su provini non rivettati (Tipo 1), su provini con due rivetti disposti simmetricamente ad una distanza d=22 mm dalla mezzeria (Tipo 2) e su provini con 2 rivetti disposti ad una distanza d=44 mm dalla mezzeria (Tipo3). L’analisi dei risultati sper…
ANALISI DI GIUNTI A DOPPIA SOVRAPPOSIZIONE GFRP-ALLUMINIO INCOLLATI E BULLONATI
Comportamento a Fatica di Giunti Ibridi (Spr/Incollati) Cfrp-Alluminio
Sviluppo di giunzioni ibride composito-metallo
On the self-piercing riveting of aluminium blanks and carbon fibre composite panels
In the present paper the possibility to join aluminium alloys blanks and carbon fibre composites panels by self-piercing riveting operation is considered. In particular a few case studies were carried out at the varying of the process parameters. The effectiveness of the obtained joints was tested through tensile tests and through fatigue ones; what is more the process mechanics was highlighted through proper macro and micro observations of the transverse sections of the joints. The failure mechanics of the obtained joints were also considered in order to highlight the mechanisms which occur and determine the lost of the load carrying capability of the joints. Finally a numerical model of t…