Search results for "FW"
showing 10 items of 39 documents
Numerical modelling of the linear friction welding process
2010
Linear friction welding (LFW) is a solid-state joining process applied to non-axisymmetric components. LFW involves joining of materials through the relative reciprocating motion of two components under an axial force. In such process the heat source is given by the frictional forces work decaying into heat determining a local softening of the material and proper bonding conditions due to both the temperature increase and the local pressure of the two edges to be welded. In the present work the authors present a numerical model of the linear friction welding process of AISI 1045 parts. The numerical model allowed to highlight the process mechanics and the physical conditions which must be r…
On the fem simulation of FSW and LFW operations
2010
Fluctuacions quàntiques en cavitats òptiques no lineals
2011
Aquesta tesi doctoral tracta sobre alguns aspectes de la generació de llum comprimida en cavitats no lineals tipus Kerr. La llum comprimida és un dels tipus de "llum quàntica", un tipus de llum que posseeix propietats relatives a les fluctuacions en els valors esperats dels seus observables de les què no es pot donar compte si no és mitjançant l'ús de la teoria quàntica de la radiació. L'estat buit del camp electromagnètic posseeix fluctuacions d'acord amb el principi d'incertitud d'Heisenberg. En aquest context, denominem llum comprimida a un tipus de radiació que presenta en algun dels seus observables fluctuacions menors que les corresponents a l'estat buit. Aquest tipus especial de radi…
Friction based solid state welding processes
2012
Welding abilities of UFG metals
2018
Ultrafine Grained (UFG) metals are characterized by an average grain size of <1 μm and mostly high angle grain boundaries. These materials exhibit exceptional improvements in strength, superplastic behaviour and in some cases enhanced biocompatibility. UFG metals barstock can be fabricated effectively by means of Severe Plastic Deformation (SPD) methods. However, the obtained welded joints with similar properties to the base of UFG material are crucial for the production of finished engineering components. Conventional welding methods based on local melting of the joined edges cannot be used due to the UFG microstructure degradation caused by the heat occurrence in the heat affected zone…
Trasmissioni per sistemi di propulsione ibrida e Linear Friction Welding
2017
Trasmissioni per sistemi di propulsione ibrida. In tale ambito presentano interessanti caratteristiche e prestazioni, le trasmissioni a variazione continua del rapporto di tipo Power Split (PS-CVTs). La progettazione di tali trasmissioni può essere molto insidiosa a causa della notevole numero di opzioni possibili e della complessità costruttiva. Una vasta letteratura, sia sperimentale che teorica, si è occupata dell'analisi, dell'ottimizzazione e del controllo, di specifiche soluzioni costruttive. Tuttavia la selezione del layout è fondamentale e qualunque scelta aprioristica, a volte dettata solo dalla pratica, potrebbe portare a soluzioni sub-ottimali, nonostante il tempo e le risorse im…