1,721,079 research outputs found
Difettologia e proprietà dei giunti saldati, Giunzioni delle leghe leggere Tecnologie tradizionali ed innovative
No full text
Materials for Electromagnetic Purpose: The Case of a Microstrip Patch Antenna Characteristics Improvement by Additions of Metals as Spherical Inclusions Into the Substrate
Full text linkThis paper deals with the design of metamaterial (MTM) substrates to be used in electromagnetic devices. In particular, the approach has been considered for different investigations having the scope the realization of antennas on flexible substrates. The importance of the topic resides in the potential of conforming the antenna to/on desirable shapes. Flexibility is well exploitable either in advanced communication systems or in biomedical applications, just to mention some. The proposed MTM is made of metallic spherical inclusions of AISI52100, which are embedded in a polymer host. The paper aims to assess the feasibility of increasing the performance of a microstrip patch antenna, and to decrease its size by using the MTM substrate, which is able to locally control the permittivity of the substrate and to create electromagnetic band-gap regions outside of the patch
Evaluation of thixoforging process for steering piston production as possible alternative to hot forging
No full textIn this paper, the evolution from hot forging to thixoforging process is presented. A real-case study, involving a steel-made steering piston production by thixoforging technique is evaluated. The transition between the traditional forging process and the new one involves several transformations and presents difficulties mainly due to the high working temperature. The targeted thixoforging technology allows obtaining near-net-shape components with good surface quality and mechanical properties provided along with a substantial reduction in material quantity, and implicitly of the involved amount of energy. According to the reported Finite Element based simulation results, the thixoforged component will weight 9.3 kg, which is 1 kg less than that obtained by hot forging technique. The total material saving at the starting billet level compared to the hot forging process corresponds to 2.3 k
Evolution of modern Casting processes, a competitive way toward very high performance Al components
No full textPurpose of this paper is presenting an overview of alternative methods of production of enhanced performance Al-based alloys components for critical areas. The origin, development and current evolution of the semi-solid metal processing is illustrated with characteristics of real life components for automotive industry. Different techniques are presented to provide a general idea prevalently on the commercially available semi-solid metal processing techniques. Comparison with traditional methods in terms of process parameters and tensile properties are illustrated and discussed. Innovative semi-solid metal processing methods leads obtaining at least the same level of properties and performances of those obtained by conventional techniques, but their real and key benefits are given by a faster production rates at inferior cost. Based on the up to date achieved outcomes, it appears that the current competition is extremely relevant and some concurrent technologies are very competitive. New and recently developed semi-solid metal processing methods show high level of potentiality and at the same time there is a serious need for additional and more detailed rheological data. The continuous increase of Al-based alloys in different applications involves manufacturing high integrity and superior performance components using cost-effective and safely processes. In this direction the research communities together with manufacturing industries are focusing their attention to develop new products using innovative procedures, such as the semi-solid metal processing route. The central issue is the technological transfer to industry for affordable mass production
LIF4MEN: per una maggiore competitività di componenti in lega di alluminio ad elevate prestazion
No full textThe effects of microstructural characteristics and casting defects on the mechanical failure of Al-based alloys
No full textStudy and Optimization of Metal Based Sintered Materials for Automotive Brake Friction Production
No full text- …
