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Department of Manufacturing and Materials Engineering
UNICAMP - University of Campinas
Experienced Professor with a demonstrated history of working in the higher education industry. Strong education professional with a Doctorate focused in Materials and Process on UNICAMP - Campinas University. More than 23 years experience working in University of Campinas (Brazil) with Production and Characterization of syntactic foams and low density metal matrix composites. • Hands on experience in equipment design and construction. • Grasp of both technical and practical presentations at symposiums and fairs on materials; • Understanding of hydraulic and pneumatic systems, and thermal analyses; • Experience in machining, forging and casting of ferrous and non-ferrous metals; • Experience abroad, having lived 2 months in France;
Mechanical Behavior of Materials
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H.M. Enginsoy, E. Bayraktar, D. Katundi, F. Gatamorta, and I. Miskioglu
Composites Part B: Engineering, ISSN: 13598368, Volume: 194, Published: 1 August 2020 Elsevier BV
E. Bayraktar, I. Miskioglu, D. Katundi, and F. Gatamorta
Conference Proceedings of the Society for Experimental Mechanics Series, ISSN: 21915644, eISSN: 21915652, Pages: 15-25, Published: 2020 Springer International Publishing
Aluminum based hybrid composites were produced from recycled AA7075 chips with the addition of TiC (d ≤ 3–5 micron), MoS2 and Al2O3 fiber. In the two groups of composites produced, the content of MoS2 and Al2O3 were fixed as 2 wt % and 3 wt % respectively, whereas TiC content was at two levels (5–10%). The combined method of powder metallurgy route, sintering followed by forging, was used to manufacture these composites. These composites are targeted for aeronautical and automotive industries for components subjected to static as well as cyclic and dynamic loading. In addition to mechanical properties, machinability of these composites is of importance hence, MoS2 was included in the formulation. Micro hardness, 3 point bending, low velocity impact and nanoindentation (creep and wear) tests were performed on samples manufactured by just sintering and sintering followed by forging. The results showed that, in generals, the samples that were forged after sintering yielded better properties. The microstructure analyses (matrix/interface) have been carried out by Scanning Electron Microscope (SEM).
F. Gatamorta, Ibrahim Miskioglu, E. Bayraktar, and M. L. N. M. Melo
Conference Proceedings of the Society for Experimental Mechanics Series, ISSN: 21915644, eISSN: 21915652, Pages: 41-46, Published: 2020 Springer International Publishing
In this work, an alternative aluminium matrix composite (AMCs) was designed from the recycled chips of the aluminium, Alumix 431 given by Brazilian aeronautic company, through combined method of powder metallurgy followed by Sintering + Forging. We aimed for the application for the connection pieces to transfer motion mainly used in automotive and aeronautical area as an alternative replacement for conventional alloys used in this area. First of all, A typical matrix was developed from recycled aluminium (AA 431) chips by high energy milling in a planetary ball mill with an inert argon atmosphere to prevent oxidation of the powders and this matrix was reinforced basically with TiC (5 wt % and 10 wt %) and molybdenum and copper (Mo 4 wt %, Cu 4 wt %) as a secondary reinforcements respectively. Mechanical and physical properties were evaluated through micro-hardness, static compression and 3 point bending (PB) tests and impact-drop weight tests were carried out. The microstructure analyses have been carried out by Scanning Electron Microscope (SEM).
F. Gatamorta, Dhurata Katundi, E. Bayraktar, L. M. P. Ferreira, and M. L. N. M. Melo
Conference Proceedings of the Society for Experimental Mechanics Series, ISSN: 21915644, eISSN: 21915652, Pages: 47-53, Published: 2020 Springer International Publishing
In this work, magnetic shape memory composites (MSMCs) was designed as an alternative replacement of actuators. A special recycled fresh scrap pure electrolytic copper was obtained from the French aeronautic society and milling of Cu-chips was carried out by high energy milling in a planetary ball milling with an inert argon atmosphere to prevent oxidation of the powders. Composite design has been carried out through combined method of powder metallurgy and sinter Forging. Firstly, Cu matrix was doped with fine powder reinforcements (Ni, Mn-Al and Fe3O4 magnetic iron oxide) in different ratios. After that, the ball milling was carried out during the 4 h. Mechanical and physical properties of these composites were analyzed. Magnetic permeability and deformation rate was also measured. The microstructure analyses have been carried out by Scanning Electron Microscope (SEM).
Enginsoy, Gatamorta, Bayraktar, Robert and Miskioglu
Composites Part B: Engineering, ISSN: 13598368, Volume: 162, Pages: 397-410, Published: 1 April 2019 Elsevier Ltd
Abstract In this study powder metallurgy and thixoforming methods are used together to manufacture aluminum alloy based composite materials reinforced with Nb2Al particles and glass bubbles (GB). Fresh scrap recycled aluminum chips, AA7075 received mainly from Brazilian aeronautic industry, are used as the raw material. Processing parameters of the manufacturing techniques were optimized and the distribution of the reinforcing particles as well as their interfaces with the matrix were analyzed. The mechanical properties of the newly designed composite material were determined by compression and bending tests. Very detailed interface analysis and microstructure and fracture surface evaluations were performed by Scanning Electron Microscopy (SEM). The results indicate that the proposed combined powder metallurgy and thixoforming method yields metal matrix composites with good mechanical properties. A non-linear finite element model (three dimensional) was used to simulate the bending and compression behaviour of Al-Nb2Al composites. A subroutine, VUHARD, was written to use with ABAQUS to analyze the effect of thixoforming and sintering on the micro and macrostructure of the manufactured materials. Different ratios of reinforcing particulates (Nb2Al, Glass Bubbles) used in the experimental specimens were used in Representative Volume Element (RVE) for the microstructure modeling. Numerical models for the macrostructure were created using these micro-structures. It has been observed that there is a good agreement between numerical analysis and experimental results. Proposed process offers an original method for the production of newly designed composite material from recycled waste aluminum that can have a major impact on the energy consumption in the aluminum industry, and when enhanced with the numerical tools for simulation it can lead to the development of better performing materials for the aviation industry.
Claudomiro Alves, Bruna Vilas Boas and Fábio Gatamorta
Conference Proceedings of the Society for Experimental Mechanics Series, ISSN: 21915644, eISSN: 21915652, Pages: 243-247, Published: 2019 Springer New York
This study aims to investigate the influence of iron content on the mechanical property of the recycle AA356 aluminium alloy. The recycle Alloys enriched with iron were prepared by casting and samples were chemically analyzed by mass spectrometry to confirm their composition. The alloy tixoability was evaluated by thermodynamic simulation via Thermocalc®, and then other alloys samples were prepared by partial melting. The samples were analysed metallurgically and mechanically. Through microstructural analysis, it was noted the presence of Fe-rich intermetallic in the alloys enriched with iron, which were not found in the alloy as received. The presence of these intermetallic contribute to improve the mechanical strength.
Fábio Gatamorta, Mendonça, Junqueira, Bayraktar, Andrade, M. de L. M. Melo and Silva
Conference Proceedings of the Society for Experimental Mechanics Series, ISSN: 21915644, eISSN: 21915652, Pages: 237-242, Published: 2019 Springer New York
The present paper discusses response surface methodology as an efficient approach for predictive model building and optimization of the high energy milling process from the chip duplex stainless steel with a carbide vanadium addition willing to obtain the smaller particle size. The process parameters studied was milling time of 10 h and 50 h. Rotations were performed at 250 and 350 rpm. Vanadium carbide was added from 0% to 3% in weight, and a mass/ball ratio of 1/10 and 1/20. An analysis of particle size and a scanning electronic microscopy were used to measure and characterize particle size. With addition of carbide in milling process resulted on a reduction of particle size compared to the material without carbide added around 66%. The results predicted using factorial regression model showed high values of regression coefficients (R2 = 0.952) indicating good agreement with experimental data. The minimum value of particle size was obtained for following optimal conditions: rotation of 325 rpm, time of 42 h, ball/mass 18:1 and carbide 2, 67%wt. The particle size of fabricated powders after 50 h of milling with 3% vanadium carbide addition was about 186 times lower than that the initial chips.
Claudiney Mendonça, Patricia Capellato, Emin Bayraktar, Fábio Gatamorta, José Gomes, Adhimar Oliveira, Daniela Sachs, Mirian Melo and Gilbert Silva
Metals, eISSN: 20754701, Published: 2019 MDPI
The aim of this study was to provide an experimental investigation on the novel method for recycling chips of duplex stainless steel, with the addition of vanadium carbide, in order to produce metal/carbide composites from a high-energy mechanical milling process. Powders of duplex stainless steel with the addition of vanadium carbide were prepared by high-energy mechanical ball milling utilizing a planetary ball mill. For this proposal, experiments following a full factorial design with two replicates were planned, performed, and then analyzed. The four factors investigated in this study were rotation speed, milling time, powder to ball weight ratio and carbide percentage. For each factor, the experiments were conducted into two levels so that the internal behavior among them could be statistically estimated: 250 to 350 rpm for rotation speed, 10 to 50 h for milling time, 10:1 to 22:1 for powder to ball weight ratio, and 0 to 3% carbide percentage. In order to measure and characterize particle size, we utilized the analysis of particle size and a scanning electron microscopy. The results showed with the addition of carbide in the milling process cause an average of reduction in particle size when compared with the material without carbide added. All the four factors investigated in this study presented significant influence on the milling process of duplex stainless steel chips and the reduction of particle size. The statistical analysis showed that the addition of carbide in the process is the most influential factor, followed by the milling time, rotation speed and powder to ball weight ratio. Significant interaction effects among these factors were also identified.
Gatamorta, Bayraktar, Miskioglu, Katundi and Robert
Conference Proceedings of the Society for Experimental Mechanics Series, ISSN: 21915644, eISSN: 21915652, Pages: 101-110, Published: 2018 Springer New York
In this work, a special copper aluminium matrix composite (ACMMCs) obtained from the fresh scrap – chips of AA7075 and- pure electrolytic copper were designed through combined method of powder metallurgy and sinter + Forging. First of all, Al-Cu matrix was doped with ZnO after the ball milling with two basic reinforcements (Nb2Al– SiC, etc.) was carried out during the 4 h. A basic composition was prepared depending on the doping percentage of ZnO as 30 wt%. Mechanical and physical properties of this composite designed here can be improved with the doping process followed by combined method of powder compacted specimens and doping volume fractions. The surface scratch tests and micro-hardness results were compared according to the optimization conditions of the doping and the reinforcement. Static compression and impact-drop weight tests were carried out. The microstructure and damage analyses have been carried out by Scanning Electron Microscope (SEM).
Mendonça, Gatamorta, Junqueira, Silveira, Gomes, Melo and Silva
Conference Proceedings of the Society for Experimental Mechanics Series, ISSN: 21915644, eISSN: 21915652, Pages: 79-88, Published: 2018 Springer New York
Duplex stainless steels are preeminent materials that have been receiving special attention nowadays, due its considerable strength, toughness and exceptional corrosion resistance. This paper aims the production of a duplex stainless steel by powder metallurgy through cutting chips, X ray diffraction was used to identify the ferrite phase and austenite phase, also this paper compares the normal milling process to the addition of vanadium carbide to improve the milling action. To assure the significant changes by using the carbide and the change on time parameters, data was collected, and it was used statistical analysis by factorial design. Adding vanadium carbide at 0%–3%, the reduction in average particle size appeared to be significant, compared to the material without the carbide addition. The smallest particle size was obtained by the high energy milling that was performed in a planetary ball mill with ball to powder weight ratio 20:1, and mill speed of 350 rpm milled in argon atmosphere for 50 h, and adding 3% of vanadium carbide. Static data acknowledged that addition of carbides in the process is the most influential term, followed by the time of milling.
Ferreira, Gatamorta, Bayraktar and Robert
Conference Proceedings of the Society for Experimental Mechanics Series, ISSN: 21915644, eISSN: 21915652, Pages: 233-240, Published: 2017 Springer New York
In this study, aluminium matrix composites, (AMCs) have been created with porous structures reinforced with brown sugar, BN, graphite powders, boron and also fine glass bubbles. These composites are produced as sponge structures with low thermal and electrical conductivity. The process comprises a simple mixture of aluminium powders obtained from scrap aluminium chips (A2014) and glass bubbles with fresh scrap organic sugar coming from the excess of the production and their blending and finally followed by compacting of the mixture. Addition of the wax is variable from 0 up to 10 %. Sintering is carried out in two steps. First of all, the green compact is heated to eliminate entirely the sugar after that classical sintering of the structure is made under the inert atmosphere. Glass bubbles added at the beginning of the green compact create a net of interconnected porosity. Basically, drop weight test were applied to measure the impact behaviour of these sponge composites and acoustic emission capacity was measured. Microstructural and fracture behaviour were evaluated by Scanning Electron Microscopy (SEM).
Gatamorta, Bayraktar and Robert
Conference Proceedings of the Society for Experimental Mechanics Series, ISSN: 21915644, eISSN: 21915652, Pages: 7-13, Published: 2015 Springer New York LLC
This work investigates the production of Al foams using organic sugar granulates as space holders. To the Al matrix hollow glass micro spheres were added to constitute a light weight composite material. The process comprises the following steps: mixing of Al powders and organic sugar granulates, compacting of the mixture, heating the green compact to eliminate the sugar and final sintering of the metallic powder. Open spaces left by the volatilization of the sugar granulates constitute a net of interconnect porosity in the final product, which is, therefore, a metallic sponge. It was analyzed the influence of processing parameters in the different steps of production, in the final quality of products. Products were characterized concerning cells distribution and sintering interfaces. Results showed the general viability of producing composites by the proposed technique, based on a simple and low cost procedure.