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Carmelo Luis-Pérez
Engineering Department, Public University of Navarre (UPNA), Arrosadia Campus, 31006 Pamplona, Spain

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Journal article
Published: 20 July 2021 in Polymers
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Fused filament fabrication (FFF) 3D printing technology allows very complex parts to be obtained at a relatively low cost and in reduced manufacturing times. In the present work, the effect of main 3D printing parameters on roughness obtained in curved surfaces is addressed. Polylactic acid (PLA) hemispherical cups were printed with a shape similar to that of the acetabular part of the hip prostheses. Different experiments were performed according to a factorial design of experiments, with nozzle diameter, temperature, layer height, print speed and extrusion multiplier as variables. Different roughness parameters were measured—Ra, Rz, Rku, Rsk—both on the outer surface and on the inner surface of the parts. Arithmetical mean roughness value Ra and greatest height of the roughness profile Rz are usually employed to compare the surface finish among different manufacturing processes. However, they do not provide information about the shape of the roughness profile. For this purpose, in the present work kurtosis Rku and skewness Rsk were used. If the height distribution in a roughness profile follows a normal law, the Rku parameter will take a value of 3. If the profile distribution is symmetrical, the Rsk parameter will take a value of 0. Adaptive neural fuzzy inference system (ANFIS) models were obtained for each response. Such models are often employed to model different manufacturing processes, but their use has not yet been extended to 3D printing processes. All roughness parameters studied depended mainly on layer height, followed by nozzle diameter. In the present work, as a general trend, Rsk was close to but lower than 0, while Rku was slightly lower than 3. This corresponds to slightly higher valleys than peaks, with a rounded height distribution to some degree.

ACS Style

Irene Buj-Corral; Xavier Sánchez-Casas; Carmelo Luis-Pérez. Analysis of AM Parameters on Surface Roughness Obtained in PLA Parts Printed with FFF Technology. Polymers 2021, 13, 2384 .

AMA Style

Irene Buj-Corral, Xavier Sánchez-Casas, Carmelo Luis-Pérez. Analysis of AM Parameters on Surface Roughness Obtained in PLA Parts Printed with FFF Technology. Polymers. 2021; 13 (14):2384.

Chicago/Turabian Style

Irene Buj-Corral; Xavier Sánchez-Casas; Carmelo Luis-Pérez. 2021. "Analysis of AM Parameters on Surface Roughness Obtained in PLA Parts Printed with FFF Technology." Polymers 13, no. 14: 2384.

Journal article
Published: 18 May 2021 in Symmetry
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In manufacturing engineering, it is common to use both symmetrical and asymmetrical factorial designs along with regression techniques to model technological response variables, since the in-advance prediction of their behavior is of great importance to determine the levels of variation that lead to optimal response values to be obtained. For this purpose, regression techniques based on the response surface method combined with a desirability function for multi-objective optimization are commonly employed, since it is usual to find manufacturing processes that require simultaneous optimization of several variables, which exhibit in many cases an opposite behavior. However, these regression models are sometimes not accurate enough to predict the behavior of these response variables, especially when they have significant non-linearities. To deal with this drawback, soft computing techniques are very effective in overcoming the limitations of conventional regression models. This present study is focused on the employment of a symmetrical design of experiments along with a new desirability function, which is proposed in this study, and with soft computing techniques based on fuzzy logic. It will be shown that more accurate results than those obtained from regression techniques are obtained. Moreover, this new desirability function is analyzed in this study.

ACS Style

Carmelo Luis Pérez. On the Application of a Design of Experiments along with an ANFIS and a Desirability Function to Model Response Variables. Symmetry 2021, 13, 897 .

AMA Style

Carmelo Luis Pérez. On the Application of a Design of Experiments along with an ANFIS and a Desirability Function to Model Response Variables. Symmetry. 2021; 13 (5):897.

Chicago/Turabian Style

Carmelo Luis Pérez. 2021. "On the Application of a Design of Experiments along with an ANFIS and a Desirability Function to Model Response Variables." Symmetry 13, no. 5: 897.

Journal article
Published: 19 August 2020 in Mathematics
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In Manufacturing Engineering there is a need to be able to model the behavior of technological variables versus input parameters in order to predict their behavior in advance, so that it is possible to determine the levels of variation that lead to optimal values of the response variables to be obtained. In recent years, it has been a common practice to rely on regression techniques to carry out the above-mentioned task. However, such models are sometimes not accurate enough to predict the behavior of these response variables, especially when they have significant non-linearities. In this present study a comparative analysis between the precision of different techniques based on conventional regression and soft computing is initially carried out. Specifically, regression techniques, based on the response surface model, as well as the use of artificial neural networks and fuzzy inference systems along with adaptive neuro-fuzzy inference systems will be employed to predict the behavior of the aforementioned technological variables. It will be shown that when there are difficulties in predicting the response parameters by using regression models, soft computing models are highly effective, being much more efficient than conventional regression models. In addition, a new method is proposed in this study that consists of using an iterative process to obtain a fuzzy inference system from a design of experiments and then using an adaptive neuro-fuzzy inference system for tuning the constants of the membership functions. As will be shown, with this method it is possible to obtain improved results in the validation metrics. The means of selecting the membership functions to develop this model from the design of experiments is discussed in this present study in order to obtain an initial solution, which will be then tuned by using an adaptive neuro-fuzzy inference system, to predict the behavior of the response variables. Moreover, the obtained results will also be compared.

ACS Style

C. J. Luis Pérez. A Proposal of an Adaptive Neuro-Fuzzy Inference System for Modeling Experimental Data in Manufacturing Engineering. Mathematics 2020, 8, 1390 .

AMA Style

C. J. Luis Pérez. A Proposal of an Adaptive Neuro-Fuzzy Inference System for Modeling Experimental Data in Manufacturing Engineering. Mathematics. 2020; 8 (9):1390.

Chicago/Turabian Style

C. J. Luis Pérez. 2020. "A Proposal of an Adaptive Neuro-Fuzzy Inference System for Modeling Experimental Data in Manufacturing Engineering." Mathematics 8, no. 9: 1390.

Journal article
Published: 11 July 2020 in Metals
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In the present study, the wear behaviour of two aluminium alloys (AA-5754 and AA-5083) is analysed where these have been previously processed by severe plastic deformation (SPD) with equal channel angular pressing (ECAP). In order to achieve the objectives of this study, several disks made of these alloys are manufactured by isothermal forging from different initial states. The microstructures of the initial materials analysed in this study have different accumulated deformation levels. In order to compare the properties of the nanostructured materials with those which have not been ECAP-processed, several disks with a height of 6 mm and a diameter of 35 mm are manufactured from both aluminium alloys (that is, AA-5754 and AA-5083) isothermally forged at temperatures of 150 and 200 °C, respectively. These thus-manufactured disks are tested under a load of 0.6 kN, which is equivalent to a stress mean value of 18 MPa, and at a rotational speed of 200 rpm. In order to determine the wear values, the disks are weighed at the beginning, at 10,000 revolutions, at 50,000 revolutions and at 100,000 revolutions, and then the volume-loss values are calculated. This study was carried out using specific equipment, which may be considered to have a block-on-ring configuration, developed for testing in-service wear behaviour of mechanical components. From this, the wear coefficients for the two materials at different initial states are obtained. In addition, a comparison is made between the behaviour of the previously ECAP-processed aluminium alloys and those that are non-ECAP-processed. A methodology is proposed to determine wear coefficients for the aluminium alloys under consideration, which may be used to predict the wear behaviour. It is demonstrated that AA-5754 and AA-5083 aluminium alloys improve wear behaviour after the ECAP process compared to that obtained in non-ECAP-processed materials.

ACS Style

Carmelo J. Luis Pérez; Rodrigo Luri Irigoyen; Ignacio Puertas Arbizu; Daniel Salcedo Pérez; Javier León Iriarte; Juan P. Fuertes Bonel. Analysis of Tribological Properties in Disks of AA-5754 and AA-5083 Aluminium Alloys Previously Processed by Equal Channel Angular Pressing and Isothermally Forged. Metals 2020, 10, 938 .

AMA Style

Carmelo J. Luis Pérez, Rodrigo Luri Irigoyen, Ignacio Puertas Arbizu, Daniel Salcedo Pérez, Javier León Iriarte, Juan P. Fuertes Bonel. Analysis of Tribological Properties in Disks of AA-5754 and AA-5083 Aluminium Alloys Previously Processed by Equal Channel Angular Pressing and Isothermally Forged. Metals. 2020; 10 (7):938.

Chicago/Turabian Style

Carmelo J. Luis Pérez; Rodrigo Luri Irigoyen; Ignacio Puertas Arbizu; Daniel Salcedo Pérez; Javier León Iriarte; Juan P. Fuertes Bonel. 2020. "Analysis of Tribological Properties in Disks of AA-5754 and AA-5083 Aluminium Alloys Previously Processed by Equal Channel Angular Pressing and Isothermally Forged." Metals 10, no. 7: 938.

Journal article
Published: 05 June 2020 in Mathematics
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Technological tables are very important in electrical discharge machining to determine optimal operating conditions for process variables, such as material removal rate or electrode wear. Their determination is of great industrial importance and their experimental determination is very important because they allow the most appropriate operating conditions to be selected beforehand. These technological tables are usually employed for electrical discharge machining of steel, but their number is significantly less in the case of other materials. In this present research study, a methodology based on using a fuzzy inference system to obtain these technological tables is shown with the aim of being able to select the most appropriate manufacturing conditions in advance. In addition, a study of the results obtained using a fuzzy inference system for modeling the behavior of electrical discharge machining parameters is shown. These results are compared to those obtained from response surface methodology. Furthermore, it is demonstrated that the fuzzy system can provide a high degree of precision and, therefore, it can be used to determine the influence of these machining parameters on technological variables, such as roughness, electrode wear, or material removal rate, more efficiently than other techniques.

ACS Style

C. J. Luis Pérez. Using a Fuzzy Inference System to Obtain Technological Tables for Electrical Discharge Machining Processes. Mathematics 2020, 8, 922 .

AMA Style

C. J. Luis Pérez. Using a Fuzzy Inference System to Obtain Technological Tables for Electrical Discharge Machining Processes. Mathematics. 2020; 8 (6):922.

Chicago/Turabian Style

C. J. Luis Pérez. 2020. "Using a Fuzzy Inference System to Obtain Technological Tables for Electrical Discharge Machining Processes." Mathematics 8, no. 6: 922.

Journal article
Published: 04 April 2020 in Metals
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Severe plastic deformation (SPD) processes have attracted a great deal of both scientific and technological interest over the last few years as a consequence of the improvements that are possible to obtain in the microstructure and mechanical properties of the materials manufactured through the use of these kind of processes. However, the practical applications of such materials to obtain mechanical components are significantly fewer. As a direct consequence, the same thing has been observed in the development of studies that show the in-service behaviour of the mechanical components developed in this way. Since one of the industrial objectives of these SPD processes is to obtain functional parts, it is necessary to carry out studies to fill this gap. Therefore, in this study, an analysis of the wear that cams undergo when manufactured from an AA5083 aluminium-magnesium alloy is carried out. The cams were isothermally-forged from materials with and without previous SPD processing by equal channel angular pressing (ECAP). Subsequently, the wear behaviour of these cams was analysed by using specific equipment, which may have been considered to have a block-on-ring configuration, developed for testing in-service wear behaviour of mechanical parts. From this comparative wear study with cams, it is shown that previously-processed materials by ECAP have a better wear performance. Moreover, finite element modelling (FEM) simulations were also included to predict wear in the cams processed in this way. A good agreement between FEM and experimental results was obtained. It is this aspect of performing the wear tests on functional and real mechanical components, and not on laboratory samples, which makes this present research work novel.

ACS Style

C. J. Luis Pérez; R. Luri Irigoyen; J. P. Fuertes Bonel; J. León Iriarte; D. Salcedo Pérez; I. Puertas Arbizu. Experimental and FEM Analysis of Wear Behaviour in AA5083 Ultrafine-Grained Cams. Metals 2020, 10, 479 .

AMA Style

C. J. Luis Pérez, R. Luri Irigoyen, J. P. Fuertes Bonel, J. León Iriarte, D. Salcedo Pérez, I. Puertas Arbizu. Experimental and FEM Analysis of Wear Behaviour in AA5083 Ultrafine-Grained Cams. Metals. 2020; 10 (4):479.

Chicago/Turabian Style

C. J. Luis Pérez; R. Luri Irigoyen; J. P. Fuertes Bonel; J. León Iriarte; D. Salcedo Pérez; I. Puertas Arbizu. 2020. "Experimental and FEM Analysis of Wear Behaviour in AA5083 Ultrafine-Grained Cams." Metals 10, no. 4: 479.

Journal article
Published: 14 March 2019 in Materials
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In the present study, the groups of cutting conditions that minimize surface roughness and its variability are determined, in ball-end milling operations. Design of experiments is used to define experimental tests performed. Semi-cylindrical specimens are employed in order to study surfaces with different slopes. Roughness was measured at different slopes, corresponding to inclination angles of 15°, 45°, 75°, 90°, 105°, 135° and 165° for both climb and conventional milling. By means of regression analysis, second order models are obtained for average roughness Ra and total height of profile Rt for both climb and conventional milling. Considered variables were axial depth of cut ap, radial depth of cut ae, feed per tooth fz, cutting speed vc, and inclination angle Ang. The parameter ae was the most significant parameter for both Ra and Rt in regression models. Artificial neural networks (ANN) are used to obtain models for both Ra and Rt as a function of the same variables. ANN models provided high correlation values. Finally, the optimal machining strategy is selected from the experimental results of both average and standard deviation of roughness. As a general trend, climb milling is recommended in descendant trajectories and conventional milling is recommended in ascendant trajectories. This study will allow the selection of appropriate cutting conditions and machining strategies in the ball-end milling process.

ACS Style

Irene Buj-Corral; Jose-Antonio Ortiz-Marzo; Lluís Costa-Herrero; Joan Vivancos-Calvet; Carmelo Luis-Pérez. Optimal Machining Strategy Selection in Ball-End Milling of Hardened Steels for Injection Molds. Materials 2019, 12, 860 .

AMA Style

Irene Buj-Corral, Jose-Antonio Ortiz-Marzo, Lluís Costa-Herrero, Joan Vivancos-Calvet, Carmelo Luis-Pérez. Optimal Machining Strategy Selection in Ball-End Milling of Hardened Steels for Injection Molds. Materials. 2019; 12 (6):860.

Chicago/Turabian Style

Irene Buj-Corral; Jose-Antonio Ortiz-Marzo; Lluís Costa-Herrero; Joan Vivancos-Calvet; Carmelo Luis-Pérez. 2019. "Optimal Machining Strategy Selection in Ball-End Milling of Hardened Steels for Injection Molds." Materials 12, no. 6: 860.

Journal article
Published: 11 May 2017 in Metals
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In this present research work, a new modelling of energy density in EDM (Electrical Discharge Machining) is proposed. Energy density can be defined as the amount of energy needed to get a unit volume of material removed, and for its modelling, the whole EDM process has been taken into account. This new definition lets us quantify the energy density that is being absorbed by the workpiece and the electrode. Results are compared to those obtained by die sinking EDM in an Inconel ®600 alloy using Cu-C electrodes. Currently, this material is of great interest for industrial applications in the nuclear, aeronautical and chemical sectors, due to their combinations of good mechanical properties, corrosion resistance and extreme hardness at very high temperatures. The experimental results confirm that the use of negative polarity leads to a higher material removal rate, higher electrode wear and higher surface roughness. Moreover, the optimal condition to obtain a maximum MRR (Material Removal Rate) of 30.49 mm3/min was: 8 A, 100 µs and 0.6, respectively, for the current intensity, pulse time and duty cycle.

ACS Style

Alexia Torres Salcedo; Ignacio Puertas Arbizu; Carmelo J. Luis Pérez. Analytical Modelling of Energy Density and Optimization of the EDM Machining Parameters of Inconel 600. Metals 2017, 7, 166 .

AMA Style

Alexia Torres Salcedo, Ignacio Puertas Arbizu, Carmelo J. Luis Pérez. Analytical Modelling of Energy Density and Optimization of the EDM Machining Parameters of Inconel 600. Metals. 2017; 7 (5):166.

Chicago/Turabian Style

Alexia Torres Salcedo; Ignacio Puertas Arbizu; Carmelo J. Luis Pérez. 2017. "Analytical Modelling of Energy Density and Optimization of the EDM Machining Parameters of Inconel 600." Metals 7, no. 5: 166.

Journal article
Published: 21 March 2015 in The International Journal of Advanced Manufacturing Technology
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Nickel-based alloys are attractive materials for industrial applications owing to their good mechanical properties and excellent resistance to corrosion and oxidation, even under extreme conditions. In this paper, the behavior of an INCONEL 600 alloy has been studied using electrical discharge machining (EDM). The response parameters selected are the material removal rate (MRR), the electrode wear (EW), and the surface roughness (SR). All of them have been studied in terms of current intensity supplied by the generator (I), duty cycle (η), pulse time (t i ), and polarity. To carry out the experiments, design of experiment (DOE) techniques have been used in order to obtain mathematical models to predict the most influential factors by using a small number of experiments. The experimental results confirm that positive polarity leads to higher MRR whereas negative polarity leads to lower Ra values.

ACS Style

A. Torres; C. J. Luis; I. Puertas. Analysis of the influence of EDM parameters on surface finish, material removal rate, and electrode wear of an INCONEL 600 alloy. The International Journal of Advanced Manufacturing Technology 2015, 80, 123 -140.

AMA Style

A. Torres, C. J. Luis, I. Puertas. Analysis of the influence of EDM parameters on surface finish, material removal rate, and electrode wear of an INCONEL 600 alloy. The International Journal of Advanced Manufacturing Technology. 2015; 80 (1-4):123-140.

Chicago/Turabian Style

A. Torres; C. J. Luis; I. Puertas. 2015. "Analysis of the influence of EDM parameters on surface finish, material removal rate, and electrode wear of an INCONEL 600 alloy." The International Journal of Advanced Manufacturing Technology 80, no. 1-4: 123-140.

Book chapter
Published: 10 May 2014 in Advanced Structured Materials
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In the last years, new severe plastic deformation (SPD) processes have been developed in order to produce very high values of deformation in the materials to be processed, with only small changes in the size of parts. This is not possible through conventional thermo-mechanical processes, in which the increase up to the above-mentioned values of deformation is usually associated with a change in their geometry. As is well-known, with enough accumulation of plastic deformation, a new submicrometric or even nanometric grain structure substitutes the former. Given that the grain size in metallic materials has a great deal of influence on their mechanical properties, the refinement of this grain size provides enormous technological advantages. For instance, at low values of temperature, a fine grain size can increase mechanical strength, hardness, fracture toughness and the material fatigue limit. Furthermore, at high values of temperature, the alloys with an ultrafine grain size may exhibit a superplastic behaviour and thus, the ability to undergo very high values of deformation with no damage to the material. The continuous combined drawing process in angular channels (CCDR) is a new concept of severe plastic deformation process (SPD), developed by researchers belonging to the Public University of Navarre and based on the patent (ES 2224787). In the present work, finite element analysis will be employed in order to study not only the strain distribution in the processed materials but also the homogeneity of the introduced strain. Moreover, experimental results will be compared to that obtained by using FEM. With the present work, it will be shown that it is feasible to achieve a process with possible industrial application, making the continuous processing of metallic materials in angular channels by SPD possible.

ACS Style

C. J. Luis; D. Salcedo; R. Luri; J. León; I. Puertas. FEM Modelling of the Continuous Combined Drawing and Rolling Process for Severe Plastic Deformation of Metallic Materials. Advanced Structured Materials 2014, 17 -45.

AMA Style

C. J. Luis, D. Salcedo, R. Luri, J. León, I. Puertas. FEM Modelling of the Continuous Combined Drawing and Rolling Process for Severe Plastic Deformation of Metallic Materials. Advanced Structured Materials. 2014; ():17-45.

Chicago/Turabian Style

C. J. Luis; D. Salcedo; R. Luri; J. León; I. Puertas. 2014. "FEM Modelling of the Continuous Combined Drawing and Rolling Process for Severe Plastic Deformation of Metallic Materials." Advanced Structured Materials , no. : 17-45.

Nanomaterials articles
Published: 04 June 2012 in Materials and Manufacturing Processes
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The Equal Channel Angular Extrusion or Pressing (ECAE/ECAP) process has been developed over these last years in order to obtain nanostructured materials by means of severe plastic deformation. These applications have been mainly focused on light alloys while its application to iron and steel has not been so common. This is due to the difficulties that their ECAE processing implies, as much higher values for the processing force are required. In this present study, the results achieved when Armco-Fe is processed by ECAE at room temperature are shown. In addition, a comparative study on the variation in the mechanical properties (yield stress, ultimate tensile strength, and elongation at break) is shown when different thermal treatments are employed. Specific combinations are also shown of the thermal treatments which lead to a higher value of elongation and mechanical strength in relation to the starting material. Furthermore, an analysis of the obtained results is made by optical and scanning electron microscopy techniques.

ACS Style

C. J. Luis; I. Puertas; R. Luri; J. León; D. Salcedo; I. Pérez. Development of Nanostructured Armco-Fe by Equal Channel Angular Extrusion (ECAE). Materials and Manufacturing Processes 2012, 27, 1276 -1284.

AMA Style

C. J. Luis, I. Puertas, R. Luri, J. León, D. Salcedo, I. Pérez. Development of Nanostructured Armco-Fe by Equal Channel Angular Extrusion (ECAE). Materials and Manufacturing Processes. 2012; 27 (12):1276-1284.

Chicago/Turabian Style

C. J. Luis; I. Puertas; R. Luri; J. León; D. Salcedo; I. Pérez. 2012. "Development of Nanostructured Armco-Fe by Equal Channel Angular Extrusion (ECAE)." Materials and Manufacturing Processes 27, no. 12: 1276-1284.

Journal article
Published: 16 July 2011 in The International Journal of Advanced Manufacturing Technology
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Technical or advanced ceramics have achieved a great deal of importance nowadays as a consequence of their outstanding properties, which make them suitable for application to high-resistance dies and tools for drilling, metal forming and structural components, among others. Nevertheless, manufacturing of these materials is difficult and expensive because they are hard-to-machine materials. In this present study, the application of Electrical Discharge Machining (EDM) is explored for the processing of two conductive ceramics: hot-pressed boron carbide (B4C) and cobalt-bonded tungsten carbide (WC-Co). The main aim of this present study is to analyse the influence of intensity (I), pulse duration (t i), duty cycle (η), open-circuit voltage (U) and dielectric flushing pressure (P) on the quality of these manufactured products. The response variables studied are: surface roughness (Ra), volumetric electrode wear (EW) and material removal rate (MRR). This study has great industrial interest as there seems to be a lack of knowledge of die-sinking EDM of conductive ceramics in comparison with metallic materials.

ACS Style

Ignacio Puertas; Carmelo J. Luis. Optimization of EDM conditions in the manufacturing process of B4C and WC-Co conductive ceramics. The International Journal of Advanced Manufacturing Technology 2011, 59, 575 -582.

AMA Style

Ignacio Puertas, Carmelo J. Luis. Optimization of EDM conditions in the manufacturing process of B4C and WC-Co conductive ceramics. The International Journal of Advanced Manufacturing Technology. 2011; 59 (5-8):575-582.

Chicago/Turabian Style

Ignacio Puertas; Carmelo J. Luis. 2011. "Optimization of EDM conditions in the manufacturing process of B4C and WC-Co conductive ceramics." The International Journal of Advanced Manufacturing Technology 59, no. 5-8: 575-582.

Journal article
Published: 31 August 2008 in Mechanics of Materials
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Equal channel angular extrusion or pressing (ECAE or ECAP) is a process used to introduce severe plastic deformations (SPD) to processed materials with the aim of improving their mechanical properties by reducing the grain size. In this work a study of the required force for performing the ECAE process, which takes into account the ECAE dies proposed by Luis [Luis, C.J., 2004a. On the correct selection of the channel die in equal channel angular extrusion processes. Scripta Mater. 50, 387–393] is developed. These die geometries improve the deformations attained in the traditional ECAE dies and they allow a correct flow of the material, a complete filling of the channels and reduce the damage introduced inside the part, increasing the attained strain. By using the upper bound method the required force for performing the ECAE process in function of all the geometric parameters is determined. Although some works exist that have applied the upper bound method to analyse the ECAE process, they consider plane strain conditions. This works presents an analysis of required forces in the ECAE process considering a three dimensional geometry and hence attained results are more reliable than those obtained by assuming plane strain conditions.

ACS Style

C.J. Luis Pérez; R. Luri. Study of the ECAE process by the upper bound method considering the correct die design. Mechanics of Materials 2008, 40, 617 -628.

AMA Style

C.J. Luis Pérez, R. Luri. Study of the ECAE process by the upper bound method considering the correct die design. Mechanics of Materials. 2008; 40 (8):617-628.

Chicago/Turabian Style

C.J. Luis Pérez; R. Luri. 2008. "Study of the ECAE process by the upper bound method considering the correct die design." Mechanics of Materials 40, no. 8: 617-628.

Journal article
Published: 15 May 2005 in Journal of Materials Processing Technology
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Wire drawing is one of the most commonly used processes for obtaining wire used in mechanical applications such as: rivets, screws, welding wires, etc. In this work, several analytical methods have been employed in order to obtain the forces, energies, stresses and strains that are involved in the process. A comparative study between analytical methods and FEM results is presented, considering hardening strain materials. The material selected to carry out those analyses was an aluminium alloy AA-5083, whose flow stress was determined by an appropriate tension test. The geometric property of axisymmetry has been used in order to reduce the computational cost in the finite element simulations, and to simplify the equations for the rest of the methods introduced. The energies involved in wire drawing processes are also determined. Moreover, energies involved in the process are studied for both strain hardening and non-strain hardening materials.

ACS Style

C.J. Luis; J. León; R. Luri. Comparison between finite element method and analytical methods for studying wire drawing processes. Journal of Materials Processing Technology 2005, 164-165, 1218 -1225.

AMA Style

C.J. Luis, J. León, R. Luri. Comparison between finite element method and analytical methods for studying wire drawing processes. Journal of Materials Processing Technology. 2005; 164-165 ():1218-1225.

Chicago/Turabian Style

C.J. Luis; J. León; R. Luri. 2005. "Comparison between finite element method and analytical methods for studying wire drawing processes." Journal of Materials Processing Technology 164-165, no. : 1218-1225.

Journal article
Published: 01 May 2004 in Journal of Materials Processing Technology
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Much effort has been devoted to the study of superplastic forming in aluminium alloys because of its engineering advantages. From a mechanical point of view, the ability of a crystalline material to undergo superplastic behaviour is usually linked to a submicrometer grain size. Equal channel angular extrusion (ECAE) processes allow obtaining of micrometer or even nanometer grain size and mechanical properties are hence improved. Moreover, in ECAE the cross-section of the specimen does not change, in contrast with traditional deformation methods. This work presents a study of the application of this technique using different die angles. Finite element modelling is included in order to analyse the deformation fields as the material passes through the dies. Also the influence of the die geometry on the deformations is studied. In order to perform the FEM simulations the physical properties of the 3103 Al–Mn alloy have been selected. Also experimental results performed on a 5083 Al–Mg alloy have been included.

ACS Style

C.J. Luis-Pérez; R. Luri-Irigoyen; D. Gastón-Ochoa. Finite element modelling of an Al?Mn alloy by equal channel angular extrusion (ECAE). Journal of Materials Processing Technology 2004, 1 .

AMA Style

C.J. Luis-Pérez, R. Luri-Irigoyen, D. Gastón-Ochoa. Finite element modelling of an Al?Mn alloy by equal channel angular extrusion (ECAE). Journal of Materials Processing Technology. 2004; ():1.

Chicago/Turabian Style

C.J. Luis-Pérez; R. Luri-Irigoyen; D. Gastón-Ochoa. 2004. "Finite element modelling of an Al?Mn alloy by equal channel angular extrusion (ECAE)." Journal of Materials Processing Technology , no. : 1.

Journal article
Published: 29 February 2004 in Scripta Materialia
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Equal channel angular pressing is an innovative process for obtaining severe plastic deformations in materials. In this work an optimised design of the channel die is presented which improves deformations obtained in materials using standard dies.

ACS Style

C.J. Luis Pérez. On the correct selection of the channel die in ECAP processes. Scripta Materialia 2004, 50, 387 -393.

AMA Style

C.J. Luis Pérez. On the correct selection of the channel die in ECAP processes. Scripta Materialia. 2004; 50 (3):387-393.

Chicago/Turabian Style

C.J. Luis Pérez. 2004. "On the correct selection of the channel die in ECAP processes." Scripta Materialia 50, no. 3: 387-393.

Journal article
Published: 20 December 2003 in Journal of Materials Processing Technology
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The study of superplastic forming in aluminium alloys has involved many efforts for its cost and engineering advantages. Mechanistically, the ability of a crystalline material to undergo superplastic behaviour is usually linked to a submicrometer grain size. Equal channel angular extrusion (ECAE) is an innovative technique for developing an ultrafine-grained (UFG) microstructure by introducing severe plastic deformation in a bulk material with no changes in their cross-section. This work presents a study using finite element modelling (FEM) of the ECAE process with two usual angles of 90° and 120°, considering different friction conditions. Deformation imparted through the ECAE process, is studied by modifying the processing conditions and determining the effect of friction between the dies and the billet. Moreover, experimental ECAE processes has been carried out with the 3103 Al–Mn alloy and the 5083 Al–Mg alloy, through Route A. The channel angle was 120° for the former and 90° for the latter, and the process was conducted at room temperature and 200 °C, respectively.

ACS Style

C.J. Luis Pérez; P. Gonzalez; Y. Garces. Equal channel angular extrusion in a commercial Al–Mn alloy. Journal of Materials Processing Technology 2003, 143-144, 506 -511.

AMA Style

C.J. Luis Pérez, P. Gonzalez, Y. Garces. Equal channel angular extrusion in a commercial Al–Mn alloy. Journal of Materials Processing Technology. 2003; 143-144 ():506-511.

Chicago/Turabian Style

C.J. Luis Pérez; P. Gonzalez; Y. Garces. 2003. "Equal channel angular extrusion in a commercial Al–Mn alloy." Journal of Materials Processing Technology 143-144, no. : 506-511.