22 results on '"Memola Capece Minutolo, Fabrizio"'
Search Results
2. A new approach to study the influence of the weld bead morphology on the fatigue behaviour of Ti–6Al–4V laser beam-welded butt joints
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Boccarusso, Luca, Arleo, Giuseppe, Astarita, Antonello, Bernardo, Franco, De Fazio, Piero, Durante, Massimo, Memola Capece Minutolo, Fabrizio, Sepe, Raffaele, and Squillace, Antonino
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- 2017
- Full Text
- View/download PDF
3. Laser treatment of a cold sprayed titanium coating: preliminary experimental results and numerical modelling
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ASTARITA, ANTONELLO, GENNA, SILVIO, LEONE, CLAUDIO, MEMOLA CAPECE MINUTOLO, FABRIZIO, SQUILLACE, ANTONINO, Carlone P., Palazzo G. S., Rubino F., F. Micari, F. Franceschini et al., Astarita, Antonello, Carlone, P., Genna, Silvio, Leone, Claudio, MEMOLA CAPECE MINUTOLO, Fabrizio, Palazzo, G. S., Rubino, F., and Squillace, Antonino
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laser treatment ,microstructure ,cold spray ,oxyde ,titanium - Abstract
The aim of this paper was to investigate the effects of a post-deposition laser treatment on the titanium cold-sprayed coatings. Commercially pure grade 2 titanium powders were deposited onto an aluminum alloys AA2020-T3 substrate, using a commercial cold spray system. Pre-heated helium was employed as powder carrier gas. Coatings were heat treated using a 220 W diode laser, in order to improve the cohesion between titanium particles, reduce the porosity percentage and promote a homogeneous microstructure. Several samples were realized varying the thickness ratio between the two layers and the scan rate of laser source, to reproduce and investigate the effect of different temperature distributions. Geometry features and microstructure of treated zone were assessed by means of conventional optical microscopy and scanning electron microscopy. Microhardness measurements were carried out to evaluate the mechanical properties of the coating layer. A numerical model of the laser treatment was also implemented to discuss the experimental outcomes.
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- 2015
4. Some remarks about single and two point incremental forming
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FORMISANO, ANTONIO, BOCCARUSSO, LUCA, MEMOLA CAPECE MINUTOLO, FABRIZIO, CARRINO, LUIGI, DURANTE, MASSIMO, LANGELLA, ANTONIO, Formisano, Antonio, Boccarusso, Luca, MEMOLA CAPECE MINUTOLO, Fabrizio, Carrino, Luigi, Durante, Massimo, and Langella, Antonio
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Incremental forming, FEM analyses, Forming time, Forming force, Deformative state - Abstract
Incremental forming process, in all its variants, results to be ideal when flexibility is required, especially for small-batch and customized production. Two point incremental forming with partial die (TPIF) presents notable advantages compared to single point incremental forming (SPIF) for obtaining components that present both concave and convex zones; on the other hand, these advantages are not so evident in the case of simple geometries. The following study compares the two techniques by geometrical considerations, FEM analyses and experimental evaluations. Cone frusta are obtained starting from aluminum alloy sheets and features like geometric accuracy, forming and setup times, forming forces and deformative states are investigated, in order to highlight differences and similarities between the two techniques. In particular, TPIF allows to obtain geometries very similar to the designed ones, but requires higher setup and forming times.
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- 2015
5. A new approach to study the influence of the weld bead morphology on the fatigue behaviour of Ti–6Al–4V laser beam-welded butt joints
- Author
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Boccarusso, Luca, primary, Arleo, Giuseppe, additional, Astarita, Antonello, additional, Bernardo, Franco, additional, De Fazio, Piero, additional, Durante, Massimo, additional, Memola Capece Minutolo, Fabrizio, additional, Sepe, Raffaele, additional, and Squillace, Antonino, additional
- Published
- 2016
- Full Text
- View/download PDF
6. Selective Laser Post-Treatment on Titanium Cold Spray Coatings
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Rubino, Felice, primary, Astarita, Antonello, additional, Carlone, Pierpaolo, additional, Genna, Silvio, additional, Leone, Claudio, additional, Memola Capece Minutolo, Fabrizio, additional, and Squillace, Antonino, additional
- Published
- 2015
- Full Text
- View/download PDF
7. Selective Laser Post-Treatment on Titanium Cold Spray Coatings.
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Rubino, Felice, Astarita, Antonello, Carlone, Pierpaolo, Genna, Silvio, Leone, Claudio, Memola Capece Minutolo, Fabrizio, and Squillace, Antonino
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TITANIUM ,SURFACE coatings ,ALUMINUM alloys ,METAL spraying ,SEMICONDUCTOR lasers ,SCANNING electron microscopy - Abstract
The aim of the present work is to investigate the feasibility and effects of a selective postdeposition laser treatment on titanium coatings. Commercially pure titanium grade 2 powders were deposited by means of a cold spray process on aluminum alloy AA2024-T3 sheets. The surface treatment of the coating was realized using a 220 W diode laser. The influence of heat input and dimensional features of coating layer and substrate was assessed by an experimental campaign conducted following a design of experiments approach. Optical and scanning electron microscopy analysis of the microstructure of the deposited and treated material as well as microhardness measurements showed the formation of a compact layer of titanium oxide on the coating surface and the preservation of the temper state of the aluminum substrate. [ABSTRACT FROM PUBLISHER]
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- 2016
- Full Text
- View/download PDF
8. A new approach to study the influence of the weld bead morphology on the fatigue behaviour of Ti–6Al–4V laser beam-welded butt joints
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Massimo Durante, Antonino Squillace, Antonello Astarita, Giuseppe Arleo, Fabrizio Memola Capece Minutolo, Franco Bernardo, Piero De Fazio, Luca Boccarusso, Raffaele Sepe, Boccarusso, Luca, Arleo, Giuseppe, Astarita, Antonello, Bernardo, Franco, de Fazio, Piero, Durante, Massimo, MEMOLA CAPECE MINUTOLO, Fabrizio, Sepe, Raffaele, Squillace, Antonino, Memola Capece Minutolo, Fabrizio, and De Fazio, Piero
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0209 industrial biotechnology ,Materials science ,02 engineering and technology ,Welding ,Industrial and Manufacturing Engineering ,law.invention ,020901 industrial engineering & automation ,law ,Ti-6Al-4V ,Laser power scaling ,Composite material ,Joint (geology) ,Fatigue ,Laser beam welding (LBW) ,Stress concentration ,FE analysis ,Ti–6Al–4V ,Welded morphology ,Control and Systems Engineering ,Software ,Mechanical Engineering ,Computer Science Applications1707 Computer Vision and Pattern Recognition ,Metallurgy ,Laser beam welding ,021001 nanoscience & nanotechnology ,Microstructure ,Aspect ratio (image) ,Computer Science Applications ,Laser beam welding (LBW), Ti-6Al-4V, Welded morphology, FE analysis, Fatigue ,Butt joint ,FE analysi ,0210 nano-technology - Abstract
Ti–6Al–4V is an alloy increasingly used in aeronautics due to its high mechanical properties coupled with lightness. An effective technology used to manufacture titanium components with a reduced buy-to-fly ratio is laser beam welding. Previous studies showed that the key factor that rules the mechanical properties and the fatigue life of the joint is its morphology. The aims of this paper were to investigate the influence of the geometrical features of the joints (height of the top and root reinforcement, depth and radius of the underfill, and the valley–valley underfill distance) on their mechanical properties and also to conduct a finite element (FE) analysis on the real geometry of the welded joints. Ti–6Al–4V rolled sheets 3.2 mm thick were welded in butt joint configuration using a laser source and their performance was studied in terms of weld morphology, microstructure, Vickers microhardness and fatigue life. A full factorial plan, designed varying the welding speed and laser power, was carried out. The real geometry and then the joint morphology were studied through an innovative approach: for each specimen, both the total weld face and the total root surface were acquired using a confocal microscope. Finally, through these acquisitions, the clouds of points of the scanned surfaces were used in order to carry out a FE analysis capable of providing a stress concentration factor, K t , value for each detected joint. The main results are the realization of a reliable FE model by an experimental agreement and the relationship found amongst the fatigue performances and some noticeable metallurgical and geometrical features, such as the underfill depth and the aspect ratio defined as the ratio between the maximum height of the joint and the valley–valley underfill distance.
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- 2017
9. Selective Laser Post-Treatment on Titanium Cold Spray Coatings
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Antonello Astarita, Antonino Squillace, Claudio Leone, Silvio Genna, Pierpaolo Carlone, Felice Rubino, Fabrizio Memola Capece Minutolo, Rubino, Felice, Astarita, Antonello, Carlone, P., Genna, Silvio, Leone, Claudio, MEMOLA CAPECE MINUTOLO, Fabrizio, Squillace, Antonino, Carlone, Pierpaolo, and Memola Capece Minutolo, Fabrizio
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EDM ,Materials science ,Gas dynamic cold spray ,chemistry.chemical_element ,Laser ,02 engineering and technology ,Substrate (electronics) ,engineering.material ,01 natural sciences ,Industrial and Manufacturing Engineering ,EDS ,Coating ,0103 physical sciences ,Mechanics of Material ,General Materials Science ,Microstructure ,010302 applied physics ,Titanium ,Mechanical Engineering ,Metallurgy ,Post treatment ,Titanium alloy ,Cold spray ,021001 nanoscience & nanotechnology ,Titanium oxide ,chemistry ,Mechanics of Materials ,Post-treatment ,Settore ING-IND/16 - Tecnologie e Sistemi di Lavorazione ,SEM ,engineering ,Materials Science (all) ,0210 nano-technology ,Layer (electronics) - Abstract
The aim of the present work is to investigate the feasibility and effects of a selective post-deposition laser treatment on titanium coatings. Commercially pure titanium grade 2 powders were deposited by means of a cold spray process on aluminum alloy AA2024-T3 sheets. The surface treatment of the coating was realized using a 220 W diode laser. The influence of heat input and dimensional features of coating layer and substrate was assessed by an experimental campaign conducted following a design of experiments approach. Optical and scanning electron microscopy analysis of the microstructure of the deposited and treated material as well as micro hardness measurements showed the formation of a compact layer of titanium oxide on the coating surface and the preservation of the temper state of the aluminum substrate.
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- 2016
10. A numerical approach to optimize the toolpath strategy for polymers forming
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FORMISANO Antonio, DURANTE Massimo, BOCCARUSSO Luca, MEMOLA CAPECE Fabrizio, Formisano, Antonio, Durante, Massimo, Boccarusso, Luca, and MEMOLA CAPECE MINUTOLO, Fabrizio
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Incremental Sheet Forming, Polymers, FE Analysis, Toolpath Strategy - Abstract
Incremental sheet forming is a relatively new technology with a deformation strategy that resembles the layered manufacturing principle of rapid prototyping; thanks to this, it can represent a viable way to form metal and polymer sheets, guaranteeing high customization and cost-effectiveness. On the other hand, and particularly when considering thermoplastic sheets, the components obtained by this process suffer from peculiar defects like, for example, twisting and wrinkling. A way of reducing the risk of such defects is to optimize the toolpath strategy to lower in-plane forming forces. To pursue this aim, the present work follows a numerical approach; a commercial FE code was used to simulate the incremental forming of polycarbonate sheets by varying the toolpath strategy. The investigation of some features like the forming forces and the deformation states was carried out, with the goal of determining an optimized toolpath strategy for the reduction of the incremental forming forces and the consequent expectation of reduced risk of failures and defects for incremental formed polymer sheets.
- Published
- 2023
11. Formability and Surface Quality of Incrementally Formed Grade 1 Titanium Thin Sheets
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Antonio Formisano, Fabrizio Memola Capece Minutolo, Antonino Squillace, Luigi Carrino, Massimo Durante, Antonio Langella, Luca Boccarusso, Trans Tech Publications Ltd, Formisano, Antonio, Boccarusso, Luca, Carrino, Luigi, Durante, Massimo, Langella, Antonio, MEMOLA CAPECE MINUTOLO, Fabrizio, and Squillace, Antonino
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Surface (mathematics) ,0209 industrial biotechnology ,Materials science ,Manufacturing process ,Mechanical Engineering ,Titanium Alloy ,Metallurgy ,Titanium alloy ,chemistry.chemical_element ,02 engineering and technology ,Thin sheet ,021001 nanoscience & nanotechnology ,Surface Quality ,Incremental Forming ,020901 industrial engineering & automation ,Quality (physics) ,chemistry ,Mechanics of Materials ,Formability ,General Materials Science ,Galling ,0210 nano-technology ,Titanium - Abstract
The incremental forming of titanium alloy sheets combines the advantages of this advanced flexible manufacturing process, that allows to produce complex components without using dedicated tools, with the interesting properties of the material under consideration. In this study, thin sheets of grade 1 titanium were incrementally formed to evaluate their formability and surface quality by varying the tool-sheet contact conditions. Experimental tests and surface analyses highlight dependence on the contact conditions of the surface quality rather than of the formability. Moreover, they emphasize that the tool-sheet contact conditions mainly affect the repeatability of the process due to the occurrence of galling.
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- 2016
12. Negative and positive incremental forming: Comparison by geometrical, experimental, and FEM considerations
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Luca Boccarusso, Luigi Carrino, Massimo Durante, F. Capece Minutolo, Antonio Formisano, Antonio Langella, Formisano, Antonio, Boccarusso, Luca, MEMOLA CAPECE MINUTOLO, Fabrizio, Carrino, Luigi, Durante, Massimo, and Langella, Antonio
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Incremental ,Surface (mathematics) ,0209 industrial biotechnology ,Materials science ,forming ,formability ,02 engineering and technology ,Surface finish ,Industrial and Manufacturing Engineering ,020901 industrial engineering & automation ,Software ,processe ,Formability ,General Materials Science ,Limit (mathematics) ,roughness ,FEM ,Frustum ,business.industry ,Mechanical Engineering ,thinning ,Conical surface ,Structural engineering ,021001 nanoscience & nanotechnology ,Finite element method ,Mechanics of Materials ,0210 nano-technology ,business ,force - Abstract
This study compares negative incremental forming (NIF) and positive incremental forming (PIF) processes by geometrical considerations, finite element method (FEM) analyses, and experimental evaluations. Conical frusta were manufactured starting from AA5052H19 aluminum alloy sheets using both techniques. The processes were also simulated with LS-DYNA software and a close correlation between the experimental and numerical results was observed. The analysis of forming forces, forming limit diagrams (FLDs), and sheets thinning highlights that the PIF technique allows one to reach higher formability and geometrical accuracy. Finally, the differences in terms of surface quality were also discussed.
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- 2016
13. Study of the laser marking process of cold sprayed titanium coatings on aluminium substrates
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Claudio Leone, F. Memola Capece Minutolo, Antonino Squillace, Silvio Genna, Carla Velotti, Antonello Astarita, Astarita, Antonello, Genna, Silvio, Leone, C., MEMOLA CAPECE MINUTOLO, Fabrizio, Squillace, Antonino, Velotti, Carla, Astarita, A, Genna, S., Leone, Claudio, Memola Capece Minutolo, F., Squillace, A., and Velotti, C.
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Materials science ,Processing window ,Gas dynamic cold spray ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,01 natural sciences ,law.invention ,Coating ,Optical microscope ,law ,Aluminium ,0103 physical sciences ,Laser marking ,Electrical and Electronic Engineering ,Composite material ,Penetration depth ,Titanium ,010302 applied physics ,Electronic, Optical and Magnetic Material ,Cold spray ,Penetration (firestop) ,021001 nanoscience & nanotechnology ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,chemistry ,Settore ING-IND/16 - Tecnologie e Sistemi di Lavorazione ,engineering ,0210 nano-technology - Abstract
This paper deals with the study of the laser marking process of titanium cold sprayed coatings on aluminium substrates. Despite several studies regarding the laser marking process are available in literature very few attention have been paid to the marking of cold sprayed coatings and there are no previous papers in literature. Also the phenomena occurring during the marking of a porous coating are to date not fully understood and will be discussed in this paper. The experimental campaign was also repeated on grade 2 titanium rolled sheets with a thickness of 2 mm. The marking tests were carried out under different experimental conditions varying the main process parameters (i.e. laser pulse power and laser scan speed), after that the mark sections were observed by optical microscope and SEM. Both the maximum penetration depth and width of the marks were acquired and also internal damages induced by the process were studied. A correlation between the process parameters and the mark's geometry was found. The results show the effectiveness of the laser process to produce high quality marks on both the titanium layer and the titanium sheet. Moreover, a higher mark penetration on Ti coating was observed compared to the Ti sheet. However, the results show also the possibility to introduce severe and hidden damages in both materials if the process parameters are not properly set.
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- 2016
14. Influence of Eta-Phase on Wear Behavior of WC-Co Carbides
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Antonio Caraviello, F. Capece Minutolo, Antonio Langella, Luigi Carrino, Massimo Durante, Antonio Formisano, Formisano, Antonio, MEMOLA CAPECE MINUTOLO, Fabrizio, Caraviello, Antonio, Carrino, Luigi, Durante, Massimo, and Langella, Antonio
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Materials science ,Article Subject ,lcsh:Mechanical engineering and machinery ,Wear Behavior ,Widia ,chemistry.chemical_element ,Sintering ,02 engineering and technology ,Indentation hardness ,Carbide ,Machining ,Phase (matter) ,lcsh:TJ1-1570 ,Eta-Phase ,WC-Co Carbide ,020502 materials ,Mechanical Engineering ,Abrasive ,Metallurgy ,021001 nanoscience & nanotechnology ,Surfaces, Coatings and Films ,Characterization (materials science) ,0205 materials engineering ,chemistry ,0210 nano-technology ,Carbon - Abstract
Cemented carbides, also known as Widia, are hard metals produced by sintering process and widely used in mechanical machining. They show high cutting capacity and good wear resistance; consequently, they result to be excellent materials for manufacturing cutting tools and sandblast nozzles. In this work, the wear resistance of WC-Co carbides containing Eta-phase, a secondary phase present in the hard metals when a carbon content deficiency occurs, is analyzed. Different mixtures of carbide are prepared and sintered, with different weight percentages of carbon, in order to form Eta-phase and then analyze how the carbon content influences the wear resistance of the material. This characterization is carried out by abrasive wear tests. The test parameters are chosen considering the working conditions of sandblast nozzles. Additional information is gathered through microscopic observations and the evaluation of hardness and microhardness of the different mixtures. The analyses highlight that there is a limit of carbon content below which bad sintering occurs. Considering the mixtures without these sintering problems, they show a wear resistance depending on the size and distribution of the Eta-phase; moreover, the one with high carbon content deficiency shows the best performance.
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- 2016
15. Formability Evaluation of Grade 1 Titanium Sheets Depending on the Temperature by FE Analyses
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F. Capece Minutolo, Luigi Carrino, Antonio Formisano, Antonio Langella, Luca Boccarusso, Antonino Squillace, Antonello Astarita, Massimo Durante, Trans Tech Publications Ltd, Formisano, Antonio, Astarita, Antonello, Boccarusso, Luca, MEMOLA CAPECE MINUTOLO, Fabrizio, Carrino, Luigi, Durante, Massimo, Langella, Antonio, and Squillace, Antonino
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Materials science ,Mechanical Engineering ,Metallurgy ,chemistry.chemical_element ,Forming processes ,Titanium alloy ,Characterization (materials science) ,chemistry ,Mechanics of Materials ,Phase (matter) ,Ultimate tensile strength ,Formability ,General Materials Science ,FE Analyses, Forming Limit Curves, Hot Incremental Forming ,Groove (engineering) ,Titanium - Abstract
Nowadays, the need of developing high flexible forming processes matches with the need of weight reduction. In this light, the incremental forming of titanium alloys sheets can guarantee both these aspects by combining the flexibility of the process, particularly suggested for small batches and customized parts, with the good properties of titanium alloys, in particular for aerospace applications.The aim of this work was to obtain information useful to enhance the general knowledge of the hot incremental forming processes of grade 1 titanium sheets at different temperatures.First, both tensile and straight groove tests were carried out by varying the test temperature; in this phase, information regarding both the forming forces and the wear phenomena due to the tool-sheet contact was acquired.Successively, on the basis of the mechanical characterization of the sheets previously carried out, explicit analyses, effectuated by a non-linear FE code, allowed to determine the formability curves of the sheets for the different temperatures.
- Published
- 2015
16. Lightweight bio-composites based on hemp fibres produced by conventional and unconventional processes
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Massimo Durante, Antonio Formisano, Antonio Langella, F. Memola Capece Minutolo, Luca Boccarusso, Boccarusso, Luca, Durante, Massimo, Formisano, Antonio, Langella, Antonio, and MEMOLA CAPECE MINUTOLO, Fabrizio
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Matrix (chemical analysis) ,chemistry.chemical_compound ,Materials science ,chemistry ,visual_art ,visual_art.visual_art_medium ,Core (manufacturing) ,Injection moulding ,Epoxy ,Composite material ,Polyurethane - Abstract
Considering that nowadays the interest in the use of bio-composite materials is increasing more and more, this work is focused on the manufacturing of lightweight components based on hemp fibres for future applications, for example as a core for sandwich structures. Three different no-complex processes were used: a conventional hand lay-up, an unconventional infusion process and a hand lay-up process followed by injection moulding. They were used to produce bio-composite structures using an epoxy resin and/or a polyurethane foam as matrix. Depending on the process used for the manufacturing, laminates with different values of density were obtained. A detailed study in terms of both static and dynamic properties was carried out and the different mechanical behaviour for each sample typology was highlighted. The results showed that the process in which both the epoxy resin and the polyurethane foam were used as matrix allowed to obtain laminates with lower density and higher specific mechanical properties.
- Published
- 2017
17. On the performances and wear of WC-diamond like carbon coated tools in drilling of CFRP/Titanium stacks
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Filomena Impero, Luca Boccarusso, F. Memola Capece Minutolo, Fabio Scherillo, Antonino Squillace, Massimo Durante, ESAFORM, Cueto E.,Chinesta F.,Abisset-Chavanne E., Boccarusso, Luca, Durante, Massimo, Impero, Filomena, MEMOLA CAPECE MINUTOLO, Fabrizio, Scherillo, Fabio, and Squillace, Antonino
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Materials science ,Diamond-like carbon ,Machinability ,drilling, stacks of multi material, wear, tungsten carbide ,chemistry.chemical_element ,Drilling ,Titanium alloy ,chemistry.chemical_compound ,Stack (abstract data type) ,chemistry ,Tungsten carbide ,Fiber ,Composite material ,Titanium - Abstract
The use of hybrid structures made of CFRP and titanium alloys is growing more and more in the last years in the aerospace industry due to the high strength to weight ratio. Because of their very different characteristics, the mechanical fastening represent the most effective joining technique for these materials. As a consequence, drilling process plays a key role in the assembly. The one shot drilling, i.e. the contemporary drilling of the stack of the two materials, seems to be the best option both in terms of time saving and assembly accuracy. Nevertheless, due to the considerable different machinability of fiber reinforced plastics and metallic materials, the one shot drilling is a critical process both for the holes quality and for the tools wear. This research was carried out to study the effectiveness of new generation tools in the drilling of CFRP/Titanium stacks. The tools are made of sintered grains of tungsten carbide (WC) in a binder of cobalt and coated with Diamond like carbon (DLC), and are characterized by a patented geometry; they mainly differ in parent WC grain size and binder percentage. Both the cutting forces and the wear phenomena were accurately investigated and the results were analyzed as a function of number of holes and their quality. The results show a clear increase of the cutting forces with the number of holes for all the used drilling tools. Moreover, abrasive wear phenomena that affect initially the tools coating layer were observed. © 2016 Author(s).
- Published
- 2016
18. Hemp Fabric/Epoxy Composites manufactured by Infusion Process: Improvement of Fire Properties promoted by Ammonium Polyphosphate
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Luigi Carrino, Antonio Formisano, Antonio Langella, Fabrizio Memola Capece Minutolo, Luca Boccarusso, Massimo Durante, Boccarusso, Luca, Carrino, Luigi, Durante, Massimo, Formisano, Antonio, Langella, Antonio, and MEMOLA CAPECE MINUTOLO, Fabrizio
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Materials science ,Polymer-matrix composites (PMCs), Fire properties, Thermal analysis, Resin flow ,Mechanical Engineering ,Process improvement ,02 engineering and technology ,Epoxy ,Dynamic mechanical analysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,Cone calorimeter ,visual_art ,Ceramics and Composites ,visual_art.visual_art_medium ,Composite material ,0210 nano-technology ,Thermal analysis ,Ammonium polyphosphate ,Fire retardant - Abstract
The interest for natural fibers as reinforcement in composites is growing for a large number of products also for aeronautic applications, where the flame retardant requirement is fundamental. In this research, ammonium polyphosphate was incorporated as flame retardant into hemp/epoxy biocomposites produced by infusion technology. Cone calorimeter, vertical burning, dynamic mechanical analysis and bending tests were performed in order to study fire and mechanical behavior of the produced biocomposites with different percentage of ammonium polyphosphate. The results showed a decisive improvement of the flame properties; no-effect on their mechanical properties and on the technological feasibility of the process were observed. Therefore, the addition of ammonium polyphosphate enhanced flame retardancy of hemp/epoxy-resin biocomposites without sacrificing their mechanical properties.
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- 2016
19. Innovative core material produced by infusion process using hemp fibres
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Luca Boccarusso, Antonio Formisano, Massimo Durante, F. Memola Capece Minutolo, Luigi Carrino, Antonio Langella, American Institute of Physics Inc., Boccarusso, Luca, Carrino, Luigi, Durante, Massimo, Formisano, Antonio, Langella, Antonio, and MEMOLA CAPECE MINUTOLO, Fabrizio
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Shear (sheet metal) ,Materials science ,Flexural strength ,Indentation ,visual_art ,Woven fabric ,Ultimate tensile strength ,Shear strength ,visual_art.visual_art_medium ,Core (manufacturing) ,Epoxy ,Composite material - Abstract
This paper investigates the mechanical properties in term of compression, tensile, flexural and shear strength of a new hemp core based on woven fabric. The hemp core is manufactured by means an innovative vacuum infusion process in which the input both of epoxy resin and of air was allowed. In addition, a comparison among this and others more known materials used as core in sandwich structures was carried out. The results showed that the core under investigation has higher mechanical properties, without shear and indentation failure during the tests on the respective sandwich structures.
- Published
- 2016
20. Wear behaviour of epoxy resin filled with hard powders
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Antonio Langella, Luigi Carrino, Luca Boccarusso, F. Capece Minutolo, Antonio Formisano, Massimo Durante, American Institute of Physics Inc., Formisano, Antonio, Boccarusso, Luca, MEMOLA CAPECE MINUTOLO, Fabrizio, Carrino, Luigi, Durante, Massimo, and Langella, Antonio
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chemistry.chemical_classification ,Materials science ,Composite number ,Abrasive ,Thermosetting polymer ,Polymer ,Epoxy ,Wear resistance ,Composite epoxy material ,chemistry.chemical_compound ,chemistry ,visual_art ,Silicon carbide ,visual_art.visual_art_medium ,Composite material - Abstract
The development of high performance materials based on epoxy resin finds a growing number of applications in which high wear resistance is required. One major drawback in many of these applications is the relatively poor wear resistance of the epoxy resin. Therefore, in order to investigate on the possibility of increasing wear resistance of thermoset polymers filled with hard powders, sliding tests are carried out by means of a pin on disc apparatus. In particular, composite resins, constituted by an epoxy resin filled with different contents and sizes of Silicon Carbide powder, are analyzed; the wear resistance, in terms of volume loss, is measured for different abrasive counterfaces and loads.
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- 2016
21. Study of the laser remelting of a cold sprayed titanium layer
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Antonino Squillace, Claudio Leone, F. Memola Capece Minutolo, Silvio Genna, Antonello Astarita, Felice Rubino, Roberto Teti, Astarita, Antonello, Genna, Silvio, Leone, Claudio, MEMOLA CAPECE MINUTOLO, Fabrizio, Rubino, Felice, Squillace, Antonino, A., Astarita, S., Genna, F., Memola Capece Minutolo, F., Rubino, and A., Squillace
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Titanium ,Heat-affected zone ,Materials science ,Metallurgy ,Gas dynamic cold spray ,Titanium alloy ,chemistry.chemical_element ,Diode Laser ,engineering.material ,Laser Remelting ,Coating ,chemistry ,visual_art ,Cold Spray ,Settore ING-IND/16 - Tecnologie e Sistemi di Lavorazione ,visual_art.visual_art_medium ,engineering ,General Earth and Planetary Sciences ,Ceramic ,Severe plastic deformation ,Layer (electronics) ,Microstructure ,General Environmental Science - Abstract
Cold Gas Dynamic Spray is an emerging coating technology based on the use of a supersonic gas jet to accelerate (up to 1000 m/s) and to impact a powder, with size ranging from 1 to 50 μm in diameter, on a substrate. Due to the high speed, during the impact, the powder undergoes a severe plastic deformation such that it adheres on the substrate. Thanks to this method, it is possible to produce up to fully dense metallic coatings on substrates of different materials. With this technology, different kinds of powder (metals, polymers, ceramics, composite materials and nanocrystalline powders) or their mixing can be deposited. Among the various possible powders that can be deposited by cold spray, titanium is one of the most attractive materials thanks to its potential applications. A titanium layer produced onto a softer materials (i.e. aluminium alloys) could improve both the corrosion resistance and the wear properties of the components. However, the coating made with this technique could be affected by several problems, such as porosity, high roughness and low mechanical properties. A possible solution for this issues is the use of laser remelting post-deposition treatment. The present investigation deals with the application of a continuous wave diode laser in order to change the coating properties and metallographic structure. With this aim, laser remelting of a titanium cold sprayed layer were carried out on samples of grade 2 titanium alloy, 5 mm thick, obtained by cold spray technique, by using a 220 W diode laser at different scan speed. In order to avoid the influence of the particular substrate, the laser remelting process was carried after the detachment of the coating from the substrate. After laser treatments, light and SEM microscopy were carried out to analyze the geometry of remelted zone and the evolution of its microstructure morphology. Moreover, micro-hardness measurements were made to evaluate the mechanical properties. Three different metallurgical structures corresponding to the remelted zone, the heat affected zone and base material were observed. The remelted zone showed an elliptical shape, with a depth up to 0.7 mm and a martensitic microstructure. Furthermore, in this zone, hardness higher than the base material (more than threefold) was found. In conclusion, it is possible to affirm that the laser remelting is a promising technique to improve the superficial properties of titanium cold sprayed layers.
- Published
- 2015
22. Validation of a FEM Model for the Simulation of the Cold Roll Forming Process
- Author
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Massimo Durante, Antonio Caraviello, Antonio Langella, F. Capece Minutolo, Luigi Carrino, Antonio Formisano, Trans Tech Publications Ltd, Formisano, Antonio, MEMOLA CAPECE MINUTOLO, Fabrizio, Caraviello, Antonio, Carrino, Luigi, Durante, Massimo, and Langella, Antonio
- Subjects
Engineering ,business.industry ,Mechanical Engineering ,Geometric configuration ,Forming processes ,Mechanical engineering ,Structural engineering ,Hot rolled ,Finite element method ,Cold Roll Forming, Nonlinear FEM, Process Simulation, Tube Profiling ,Mechanics of Materials ,General Materials Science ,Process simulation ,business ,Nonlinear fem - Abstract
Cold roll forming is a process for plastic deformation, which allows realizing profiles, with a defined section and established length, from the plastic deformation of a metal sheet. The sheet is induced to cross several stands of rolls, arranged along the same axis of advancing. The rolls induce plastic deformation in the sheet and then lead it to the desired geometric configuration. In order to control the geometric parameters of the plate during the profiling, it was created a FEM model to simulate the final stage of the technological process, developed by an industrial production line of a company located in Naples (Italy), that sells tubes with several cross sections. In this phase, the semi-finished product, having a circular cross section, is forced to cross through four stands of rolls. In this way, it changes the geometric condition of the cross section from circular to square. The model was carried out using a non-linear calculation code, which allows analyzing the parameters of interest in the different process steps. The results, obtained numerically, were compared with the experimental ones through the measurement of five specimens, obtained directly from technological process. The values of percentage deviation, regarding the external dimension and the thickness, for each step of advancement, do not exceed the 3% of error. Then, the analysis results denote the capability to simulate the cold roll forming process using finite element method.
- Published
- 2015
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