Pub Date : 2020-02-03DOI: 10.17533/udea.redin.20200162
Luis Carlos Ruiz-Cárdenas, Luis Eduardo Llano-Sánchez, Dario Manuel Dominguez Cajeli, Martha Cecilia Melo de Alonso, Carolina González-Rodríguez
In the design of electronic circuits, stands out the power stage, which is responsible of increasing the signal characteristics, as current and voltage, for an appropriate performance of the device to fabricate. However, this stage is composed of elements like transistors, which may have a low performance, due to the undesired temperature increase, as a result of reaching the desired power. To mitigate the loss of power and with it, the temperature rise, the management of heat sink is proposed, in order to keep the work of the power stage at a stable level and avoid thermal fractures within the circuit. This manuscript presents the obtained results of the thermal analysis in finite elements of the heat sink with fins in the form of a Cesaro curve, for power semiconductors, which evidence the increase in the heat flow, with respect to the commercial ones and so, facilitate the heat evacuation for conditioning the voltage and/or current.
{"title":"Design of passive heat sinks to power semiconductor with the cesaro curve","authors":"Luis Carlos Ruiz-Cárdenas, Luis Eduardo Llano-Sánchez, Dario Manuel Dominguez Cajeli, Martha Cecilia Melo de Alonso, Carolina González-Rodríguez","doi":"10.17533/udea.redin.20200162","DOIUrl":"https://doi.org/10.17533/udea.redin.20200162","url":null,"abstract":"In the design of electronic circuits, stands out the power stage, which is responsible of increasing the signal characteristics, as current and voltage, for an appropriate performance of the device to fabricate. However, this stage is composed of elements like transistors, which may have a low performance, due to the undesired temperature increase, as a result of reaching the desired power. To mitigate the loss of power and with it, the temperature rise, the management of heat sink is proposed, in order to keep the work of the power stage at a stable level and avoid thermal fractures within the circuit. This manuscript presents the obtained results of the thermal analysis in finite elements of the heat sink with fins in the form of a Cesaro curve, for power semiconductors, which evidence the increase in the heat flow, with respect to the commercial ones and so, facilitate the heat evacuation for conditioning the voltage and/or current.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"76 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2020-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83839506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-24DOI: 10.17533/udea.redin.20200161
Alejandra Echeverry Velasquez, Mateo Velez Quintana, J. A. Posada-Montoya, J. A. Palacio-Fernandez
The piezoelectricity allows the generation of electric power taking advantage of the movement of vehicles and pedestrians. Many prototypes have been made with piezoelectric generators, but at present, their commercialization and use has not been popularized due to their low power generation and energy losses. A design of an experimental prototype of an energy harvester with piezoelectric materials that reduces these losses and generates more energy thanks to the resonance with the beams is proposed in this article. An equilateral triangular tilde is designed such it will not deform when a force act on it. The tilde has four-cantilever beams, and it is designed to resonate with the natural frequency of the piezoelectric material. This is coupled to the piezoelectric device. The vibration generated on the beam, by average of a mechanical load, is used to generate more energy when it resonates. The piezoelectric is a ceramic material and generates a nominal power of 75 mW before placing it on the beam, and 375 mW after being placed on the beam. However, the energy collection circuit has losses due to its own consumption, the transmission of energy to the storage system, and in the mechanical system.
{"title":"Design, Construction and Evaluation of an Energy Harvesting Prototype built with Piezoelectric Materials","authors":"Alejandra Echeverry Velasquez, Mateo Velez Quintana, J. A. Posada-Montoya, J. A. Palacio-Fernandez","doi":"10.17533/udea.redin.20200161","DOIUrl":"https://doi.org/10.17533/udea.redin.20200161","url":null,"abstract":"The piezoelectricity allows the generation of electric power taking advantage of the movement of vehicles and pedestrians. Many prototypes have been made with piezoelectric generators, but at present, their commercialization and use has not been popularized due to their low power generation and energy losses. A design of an experimental prototype of an energy harvester with piezoelectric materials that reduces these losses and generates more energy thanks to the resonance with the beams is proposed in this article. An equilateral triangular tilde is designed such it will not deform when a force act on it. The tilde has four-cantilever beams, and it is designed to resonate with the natural frequency of the piezoelectric material. This is coupled to the piezoelectric device. The vibration generated on the beam, by average of a mechanical load, is used to generate more energy when it resonates. The piezoelectric is a ceramic material and generates a nominal power of 75 mW before placing it on the beam, and 375 mW after being placed on the beam. However, the energy collection circuit has losses due to its own consumption, the transmission of energy to the storage system, and in the mechanical system.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"97 1","pages":"56-64"},"PeriodicalIF":1.0,"publicationDate":"2020-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86032611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-10DOI: 10.17533/UDEA.REDIN.20190729
V. Gómez-Orozco, Iván De La Pava Panche, A. Álvarez-Meza, M. Álvarez-López, A. Orozco-Gutierrez
Adjusting the stimulation parameters is a challenge in deep brain stimulation (DBS) therapy due to the vast number of different configurations available. As a result, systems based on the visualization of the volume of tissue activated (VTA) produced by a particular stimulation setting have been developed. However, the medical specialist still has to search, by trial and error, for a DBS set-up that generates the desired VTA. Therefore, our goal is developing a DBS parameter tuning strategy for current clinical devices that allows defining a target VTA under biophysically viable constraints. We propose a machine learning approach that allows estimating the DBS parameter values for a given VTA, which comprises two main stages: i) A K-nearest neighbors-based deformation to define a target VTA preserving biophysically viable constraints. ii) A parameter estimation stage that consists of a data projection using metric learning to highlight relevant VTA properties, and a regression/classification algorithm to estimate the DBS parameters that generate the target VTA. Our methodology allows setting a biophysically compliant target VTA and accurately predicts the required configuration of stimulation parameters. Also, the performance of our approach is stable for both isotropic and anisotropic tissue conductivities. Furthermore, the computational time of the trained system is acceptable for real-world implementations.
{"title":"A machine learning approach to support deep brain stimulation programming","authors":"V. Gómez-Orozco, Iván De La Pava Panche, A. Álvarez-Meza, M. Álvarez-López, A. Orozco-Gutierrez","doi":"10.17533/UDEA.REDIN.20190729","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.20190729","url":null,"abstract":"Adjusting the stimulation parameters is a challenge in deep brain stimulation (DBS) therapy due to the vast number of different configurations available. As a result, systems based on the visualization of the volume of tissue activated (VTA) produced by a particular stimulation setting have been developed. However, the medical specialist still has to search, by trial and error, for a DBS set-up that generates the desired VTA. Therefore, our goal is developing a DBS parameter tuning strategy for current clinical devices that allows defining a target VTA under biophysically viable constraints. We propose a machine learning approach that allows estimating the DBS parameter values for a given VTA, which comprises two main stages: i) A K-nearest neighbors-based deformation to define a target VTA preserving biophysically viable constraints. ii) A parameter estimation stage that consists of a data projection using metric learning to highlight relevant VTA properties, and a regression/classification algorithm to estimate the DBS parameters that generate the target VTA. Our methodology allows setting a biophysically compliant target VTA and accurately predicts the required configuration of stimulation parameters. Also, the performance of our approach is stable for both isotropic and anisotropic tissue conductivities. Furthermore, the computational time of the trained system is acceptable for real-world implementations.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"35 1","pages":"20-33"},"PeriodicalIF":1.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88441668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-10DOI: 10.17533/udea.redin.20190839
Kevin Nicolás Galvis-Arias, Luisa Daniela Hidrobo-Pedroza, M. C. García-Muñoz, Oscar Mendieta-Menjura, M. P. Tarazona-Díaz
Non-centrifugal cane sugar (NCS) is a natural sweetener with beneficial health properties. This is traditionally produced in an oven which has had technological variations. Therefore, the present study focuses on determining the effect that NCS processing technology has on its physicochemical properties. In this study, two contrasting technologies were selected: the first one corresponds to the traditional furnace, characterized by a flat combustion chamber and hemispherical pan. The second one corresponds to the furnace with a ward type combustion chamber and modified pan. The variety of sugarcane selected was RD 75-11. The physical and chemical parameters evaluated were hydrogen potential (pH), total acidity (TA), solid soluble content soluble (SSC), ash, minerals, reducing sugars, color, moisture content and heat capacity. The technology with ward- type combustion chamber and modified pan managed to concentrate the oBrix of syrup to NCS in a 36.03% unlike the traditional furnace (32.59%). The two technologies used allowed obtaining NCS with an average caloric value of 14684.9 J g-1 and soluble solid content of 90.1oBrix. It was found that the NCS is a source of minerals such as potassium (3.55 g kg-1), calcium (2.25 g kg-1) and phosphorus (0.3 g kg-1).
非离心蔗糖(NCS)是一种有益健康的天然甜味剂。传统上，这是在烤箱中制作的，这已经有了技术上的变化。因此，本研究的重点是确定NCS加工技术对其理化性质的影响。在这项研究中，选择了两种对比技术:第一种技术对应于传统的炉子，其特点是扁平的燃烧室和半球形的锅。第二种是带有ward型燃烧室和改良锅的炉。选用的甘蔗品种为RD 75-11。评价的理化参数包括氢势(pH)、总酸度(TA)、固体可溶性含量(SSC)、灰分、矿物质、还原糖、颜色、水分含量和热容。与传统炉(32.59%)相比，采用ward型燃烧室和改进锅的技术使糖浆的oBrix以36.03%的速度浓缩到NCS。采用这两种技术可获得NCS的平均热值为14684.9 J - g-1，可溶性固溶物含量为90.1oBrix。结果发现，NCS是钾(3.55 g kg-1)、钙(2.25 g kg-1)、磷(0.3 g kg-1)等矿物质的来源。
{"title":"Effect of processing technology (traditional and ward furnace) on the physicochemical properties of non-centrifugal cane sugar (NCS)","authors":"Kevin Nicolás Galvis-Arias, Luisa Daniela Hidrobo-Pedroza, M. C. García-Muñoz, Oscar Mendieta-Menjura, M. P. Tarazona-Díaz","doi":"10.17533/udea.redin.20190839","DOIUrl":"https://doi.org/10.17533/udea.redin.20190839","url":null,"abstract":"Non-centrifugal cane sugar (NCS) is a natural sweetener with beneficial health properties. This is traditionally produced in an oven which has had technological variations. Therefore, the present study focuses on determining the effect that NCS processing technology has on its physicochemical properties. In this study, two contrasting technologies were selected: the first one corresponds to the traditional furnace, characterized by a flat combustion chamber and hemispherical pan. The second one corresponds to the furnace with a ward type combustion chamber and modified pan. The variety of sugarcane selected was RD 75-11. The physical and chemical parameters evaluated were hydrogen potential (pH), total acidity (TA), solid soluble content soluble (SSC), ash, minerals, reducing sugars, color, moisture content and heat capacity. The technology with ward- type combustion chamber and modified pan managed to concentrate the oBrix of syrup to NCS in a 36.03% unlike the traditional furnace (32.59%). The two technologies used allowed obtaining NCS with an average caloric value of 14684.9 J g-1 and soluble solid content of 90.1oBrix. It was found that the NCS is a source of minerals such as potassium (3.55 g kg-1), calcium (2.25 g kg-1) and phosphorus (0.3 g kg-1).","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"30 1","pages":"64-72"},"PeriodicalIF":1.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79170262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.19053/10.19053/01211129.V28.N53.2019.9925
Jhon Edisson Rodriguez-Castellanos, Jorge E. Cote-Ballesteros
{"title":"Anti-Windup Strategy Based on Back Calculation and Tracking Applied to Direct PID Fuzzy Controllers","authors":"Jhon Edisson Rodriguez-Castellanos, Jorge E. Cote-Ballesteros","doi":"10.19053/10.19053/01211129.V28.N53.2019.9925","DOIUrl":"https://doi.org/10.19053/10.19053/01211129.V28.N53.2019.9925","url":null,"abstract":"","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"2 1","pages":"119-139"},"PeriodicalIF":1.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73784184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-01DOI: 10.17533/UDEA.REDIN.N91A09
Sergio M. Pico Hernández, J. Estévez, L. J. L. Giraldo, C. J. M. Méndez
Supercritical extraction of bioactive compounds from cocoa husk: study of the main parameters Extracción supercrítica de compuestos bioactivos de la cáscara de cacao: estudio de los principales parámetros Sergio M. Pico Hernández1, Jaime Jaimes Estévez1, Luis J. López Giraldo1*, Cristian J. Murillo Méndez2 1Escuela de Ingeniería Química, Universidad Industrial de Santander. Carrera 27 Calle 9. C. P. 680002. Bucaramanga, Colombia. 2Escuela de Química, Universidad Industrial de Santander. Carrera 27 Calle 9. C. P. 680002. Bucaramanga, Colombia.
Supercritical提取bioactive化合物from cocoa势必:study of the main parameters超临界萃取可可壳:研究生物活性化合物主要参数的塞尔希奥·m峰值hernandez1 Jaime Jaimes女士日1、路易斯·j . lopez Giraldo1 *,Cristian j . Murillo mendez工业大学化学工程2 1Escuela桑坦德。卡雷拉27街9号。邮政信箱680002。哥伦比亚布卡拉曼加，桑坦德工业大学化学学院。卡雷拉27街9号。邮政信箱680002。布卡拉曼加、哥伦比亚。
{"title":"Extracción supercrítica de compuestos bioactivos de la cáscara de cacao: estudio de los principales parámetros","authors":"Sergio M. Pico Hernández, J. Estévez, L. J. L. Giraldo, C. J. M. Méndez","doi":"10.17533/UDEA.REDIN.N91A09","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N91A09","url":null,"abstract":"Supercritical extraction of bioactive compounds from cocoa husk: study of the main parameters Extracción supercrítica de compuestos bioactivos de la cáscara de cacao: estudio de los principales parámetros Sergio M. Pico Hernández1, Jaime Jaimes Estévez1, Luis J. López Giraldo1*, Cristian J. Murillo Méndez2 1Escuela de Ingeniería Química, Universidad Industrial de Santander. Carrera 27 Calle 9. C. P. 680002. Bucaramanga, Colombia. 2Escuela de Química, Universidad Industrial de Santander. Carrera 27 Calle 9. C. P. 680002. Bucaramanga, Colombia.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"13 1","pages":"95-105"},"PeriodicalIF":1.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85985426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Beneficio puzolánico de las mezclas de cenizas volantes y de escorio de acero en el desarrollo de la resistencia a la compresión uniaxial del suelo estabilizado con cal","authors":"Jijo James, E. David, Mahalakshmi Nagarathinam, Mohan Kumar Thaniyarasu, Jayapal Madhu","doi":"10.19053/01211129.V27.N49.2018.8544","DOIUrl":"https://doi.org/10.19053/01211129.V27.N49.2018.8544","url":null,"abstract":"","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"11 1","pages":"7-21"},"PeriodicalIF":1.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81298503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-30DOI: 10.17533/UDEA.REDIN.N89A11
Isabel Cristina Satizábal-Echavarría, Nancy María Acevedo-Quintana
Information of academic systems can be stolen, modified or erased by attackers, causing losses to institutions. Applying a risk prevention methodology at educational institutions would help to avoid academic information misuse by users or attackers. MePRiSIA was designed as a risk prevention methodology to be simple and easy to understand while including the human factor in each step. This methodology has four steps to be considered in the process: setting the context, risk identification, risk analysis, and risk prevention. After being applied to the academic information system of Universidad de Pamplona (Colombia) called ACADEMUSOFT, MePRiSIA was evaluated by experts. In conclusion, after applying MePRiSIA to ACADEMUSOFT, the human factor was part of its most important assets and involved in the very high-level risks identified. According to the experts, implementation of MePRiSIA is hard when institution directors do not provide staff and financial resources for this purpose.
{"title":"MePRiSIA: risk prevention methodology for academic information systems","authors":"Isabel Cristina Satizábal-Echavarría, Nancy María Acevedo-Quintana","doi":"10.17533/UDEA.REDIN.N89A11","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N89A11","url":null,"abstract":"Information of academic systems can be stolen, modified or erased by attackers, causing losses to institutions. Applying a risk prevention methodology at educational institutions would help to avoid academic information misuse by users or attackers. MePRiSIA was designed as a risk prevention methodology to be simple and easy to understand while including the human factor in each step. This methodology has four steps to be considered in the process: setting the context, risk identification, risk analysis, and risk prevention. After being applied to the academic information system of Universidad de Pamplona (Colombia) called ACADEMUSOFT, MePRiSIA was evaluated by experts. In conclusion, after applying MePRiSIA to ACADEMUSOFT, the human factor was part of its most important assets and involved in the very high-level risks identified. According to the experts, implementation of MePRiSIA is hard when institution directors do not provide staff and financial resources for this purpose.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"25 1","pages":"81-101"},"PeriodicalIF":1.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78700118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-19DOI: 10.17533/UDEA.REDIN.N89A10
Brayan David Verdugo-Torres, Jairo Antonio Cubillos-Lobo, Hugo Alfonso Rojas-Sarmiento
The enantioselective epoxidation of styrene using in-situ generated dimethyldioxirane (DMD) and dimeric homochiral Mn(III)-Schiff base catalyst 1 has been explored. The parameters evaluated were olefin/oxidant molar ration, catalyst loading, reaction temperature and presence of nitrogen coordinating co-catalysts. Conversions of more than 99% and enantiomeric excess 66% were obtained. The selectivity is complete towards styrene oxide using 2 mol% catalyst loading, 1.36 mmol KHSO 5 in 8 ml of water, absence of co-catalyst and 17 °C as reaction temperature. Furthermore, the catalyst could be recycled up to three times with slightly decrease of catalytic activity due mainly to the physical loss of the catalyst during the recovery step and at a lesser extent as a consequence of its oxidative degradation.
{"title":"Enantioselective epoxidation of styrene using in-situ generated dimethyldioxirane and dimeric homochiral Mn(III)-Schiff base complex catalyst","authors":"Brayan David Verdugo-Torres, Jairo Antonio Cubillos-Lobo, Hugo Alfonso Rojas-Sarmiento","doi":"10.17533/UDEA.REDIN.N89A10","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N89A10","url":null,"abstract":"The enantioselective epoxidation of styrene using in-situ generated dimethyldioxirane (DMD) and dimeric homochiral Mn(III)-Schiff base catalyst 1 has been explored. The parameters evaluated were olefin/oxidant molar ration, catalyst loading, reaction temperature and presence of nitrogen coordinating co-catalysts. Conversions of more than 99% and enantiomeric excess 66% were obtained. The selectivity is complete towards styrene oxide using 2 mol% catalyst loading, 1.36 mmol KHSO 5 in 8 ml of water, absence of co-catalyst and 17 °C as reaction temperature. Furthermore, the catalyst could be recycled up to three times with slightly decrease of catalytic activity due mainly to the physical loss of the catalyst during the recovery step and at a lesser extent as a consequence of its oxidative degradation.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"180 1 1","pages":"73-80"},"PeriodicalIF":1.0,"publicationDate":"2018-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78154390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-10DOI: 10.17533/UDEA.REDIN.N89A09
Veronica Carmen Di Graci-Tiralongo, Omar José Zurita-Hurtado, Maria Cristina Capace-Aguirre
In this work, the effect of the torsion process angle of twist and distance from the center of cylindrical bars on the microhardness profile of annealed AISI 1045 steel was studied. The results showed that the microhardness increase with the evaluated parameters and the hardening is related to the plastic deformation caused by the process rather than by microstructural transformations. Based on the experimental results, ANOVA-Pareto analysis was conducted proving that the angle of twist is the most influential control factor (59.35%) among the parameters investigated. Finally, a model to predict the microhardness profile from the torsion process is presented.
{"title":"Model for microhardness profile prediction of annealed AISI 1045 steel cylindrical bars subjected to torsion","authors":"Veronica Carmen Di Graci-Tiralongo, Omar José Zurita-Hurtado, Maria Cristina Capace-Aguirre","doi":"10.17533/UDEA.REDIN.N89A09","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N89A09","url":null,"abstract":"In this work, the effect of the torsion process angle of twist and distance from the center of cylindrical bars on the microhardness profile of annealed AISI 1045 steel was studied. The results showed that the microhardness increase with the evaluated parameters and the hardening is related to the plastic deformation caused by the process rather than by microstructural transformations. Based on the experimental results, ANOVA-Pareto analysis was conducted proving that the angle of twist is the most influential control factor (59.35%) among the parameters investigated. Finally, a model to predict the microhardness profile from the torsion process is presented.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"13 15 1","pages":"68-72"},"PeriodicalIF":1.0,"publicationDate":"2018-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75222676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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