Pub Date : 2013-03-13DOI: 10.11127/IJAMMC.2013.02.052
Y. Puri, A. Patil, P. Durugkar
This work has reviewed models and techniques for predicting the temperature distributions. The metal adjacent to a weld is exposed to severe thermal events. As a result, complex changes in metallurgical structure occur in heat affected zone region.When creating a numerical model, the aim is to implement the physical behaviour of the process into the model. However, it may be necessary to compromise between accuracy of the model and the required computational time. Different types of simplifications of the problem and more efficient computation methods are discussed
{"title":"Review on Finite Element Analysis of Temperature Distribution in Heat Affected Zone by Different Welding Process","authors":"Y. Puri, A. Patil, P. Durugkar","doi":"10.11127/IJAMMC.2013.02.052","DOIUrl":"https://doi.org/10.11127/IJAMMC.2013.02.052","url":null,"abstract":"This work has reviewed models and techniques for predicting the temperature distributions. The metal adjacent to a weld is exposed to severe thermal events. As a result, complex changes in metallurgical structure occur in heat affected zone region.When creating a numerical model, the aim is to implement the physical behaviour of the process into the model. However, it may be necessary to compromise between accuracy of the model and the required computational time. Different types of simplifications of the problem and more efficient computation methods are discussed","PeriodicalId":207087,"journal":{"name":"International Journal of Advanced Materials Manufacturing and Characterization","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128837421","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 : 2013-03-13DOI: 10.11127/ijammc.2013.02.056
R. Rao, C. Reddy
A B S T R A C T Lithium gallium phosphate glass samples were synthesized through melt quenching by varying lithium oxide, titanium oxide and gallium oxide concentrations. The de-polymarizability of glass ceramic samples was identified by Hurby’s parameter (Kgl) with the data of DTA traces. Impedance measurements were made on all the glass ceramic samples at different temperatures. The bulk resistance (R) for all the samples relative to each experimental temperature is deduced from the
{"title":"Transport Properties and Scaling Spectra of Lithium Gallium Titanate Phosphate Glass Ceramics Materials","authors":"R. Rao, C. Reddy","doi":"10.11127/ijammc.2013.02.056","DOIUrl":"https://doi.org/10.11127/ijammc.2013.02.056","url":null,"abstract":"A B S T R A C T Lithium gallium phosphate glass samples were synthesized through melt quenching by varying lithium oxide, titanium oxide and gallium oxide concentrations. The de-polymarizability of glass ceramic samples was identified by Hurby’s parameter (Kgl) with the data of DTA traces. Impedance measurements were made on all the glass ceramic samples at different temperatures. The bulk resistance (R) for all the samples relative to each experimental temperature is deduced from the","PeriodicalId":207087,"journal":{"name":"International Journal of Advanced Materials Manufacturing and Characterization","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115723585","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 : 2013-03-13DOI: 10.11127/IJAMMC.2013.02.060
V. Sonti, C. Karthick
In this paper, an Active filter design using OTA has been done. Operational transconductance amplifier is taking input as a voltage and produces output as a current at the output terminal. Active filter design using operational transconductance amplifier such as Low pass filter (LPF), High pass filter (HPF), Band pass filter (BPF), Band rejection filter (BRF),(or) notch filter are implemented. The total number of components used in these circuits is small, and design equation and voltagecontrol characteristics are attractive. Active filter designs using the transconductance amplifier are discussed. It is shown that these structures offer improvements in design simplicity and compared to op amp based structures as well as reduced component count. Simulation results of the design have been obtained and cutoff frequencies for low pass filter at 1.5 kHz, where as high pass filter 20 kHz and Bandwidth 700 kHz. At Transconductance of 10nA/v. This work has been carried out using Pspice Simulation software and the results obtained are in accordance with theoretical facts. OTA is an amplifier whose differential input voltage produces an output current at the output terminal. it also called as voltage controlled current source . There is usually an additional input for a current to control the amplifier's trans conductance. The OTA is similar to a standard operational amplifier in that it has a high impedance differential input stage and that it may be used with negative feedback. Many of the basic OTA based structures use capacitors are attractive for integration Component count of these structures is often very low when compared to VCVS designs. Convenient internal or external voltage or current control of filter characteristics is attainable with these designs. They are attractive for frequency referenced applications. Several groups have recently utilized OTAs in continuous-time monolithic filter structures. [1]. From a practical viewpoint, the high-frequency performance of discrete bipolar OTAs, such as the CA3080, is quite good. The first commercially available integrated circuits units were produced by RCA (Radio Corporation of America) in 1969 in the form of the CA3080 and they have been improved since that time. Although most units are constructed with bipolar transistors, field effect transistor units are also produced. The OTA is not as useful by itself in the vast majority of standard op-amp functions as the ordinary op-amp because its output is current.OTA application such as variable frequency oscillator and filter and variable gain amplifier stages which are more difficult to implement with standard op-amps.its output of a current contrasts to that of standard operational amplifier whose output is voltage. It is usually used open-loop without negative feedback in linear application. This is possible because the magnitude of the resistance attached to its output controls its output voltage. Therefore a resistance can be chosen that keeps the
{"title":"Active Filter Design using Bulk Driven Operational Transconductance Amplifier Topology","authors":"V. Sonti, C. Karthick","doi":"10.11127/IJAMMC.2013.02.060","DOIUrl":"https://doi.org/10.11127/IJAMMC.2013.02.060","url":null,"abstract":"In this paper, an Active filter design using OTA has been done. Operational transconductance amplifier is taking input as a voltage and produces output as a current at the output terminal. Active filter design using operational transconductance amplifier such as Low pass filter (LPF), High pass filter (HPF), Band pass filter (BPF), Band rejection filter (BRF),(or) notch filter are implemented. The total number of components used in these circuits is small, and design equation and voltagecontrol characteristics are attractive. Active filter designs using the transconductance amplifier are discussed. It is shown that these structures offer improvements in design simplicity and compared to op amp based structures as well as reduced component count. Simulation results of the design have been obtained and cutoff frequencies for low pass filter at 1.5 kHz, where as high pass filter 20 kHz and Bandwidth 700 kHz. At Transconductance of 10nA/v. This work has been carried out using Pspice Simulation software and the results obtained are in accordance with theoretical facts. OTA is an amplifier whose differential input voltage produces an output current at the output terminal. it also called as voltage controlled current source . There is usually an additional input for a current to control the amplifier's trans conductance. The OTA is similar to a standard operational amplifier in that it has a high impedance differential input stage and that it may be used with negative feedback. Many of the basic OTA based structures use capacitors are attractive for integration Component count of these structures is often very low when compared to VCVS designs. Convenient internal or external voltage or current control of filter characteristics is attainable with these designs. They are attractive for frequency referenced applications. Several groups have recently utilized OTAs in continuous-time monolithic filter structures. [1]. From a practical viewpoint, the high-frequency performance of discrete bipolar OTAs, such as the CA3080, is quite good. The first commercially available integrated circuits units were produced by RCA (Radio Corporation of America) in 1969 in the form of the CA3080 and they have been improved since that time. Although most units are constructed with bipolar transistors, field effect transistor units are also produced. The OTA is not as useful by itself in the vast majority of standard op-amp functions as the ordinary op-amp because its output is current.OTA application such as variable frequency oscillator and filter and variable gain amplifier stages which are more difficult to implement with standard op-amps.its output of a current contrasts to that of standard operational amplifier whose output is voltage. It is usually used open-loop without negative feedback in linear application. This is possible because the magnitude of the resistance attached to its output controls its output voltage. Therefore a resistance can be chosen that keeps the ","PeriodicalId":207087,"journal":{"name":"International Journal of Advanced Materials Manufacturing and Characterization","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114763880","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 : 2013-03-13DOI: 10.11127/IJAMMC.2013.02.058
V. Sreenivasulu, P. Rao, Anoop Kumar, B. Kumar
A B S T R A C T For the design of pump the system resistance (total head) is calculated by considering head and capacity correction factor for 5% consistency of pulp. This factor is taken from data book. Power required and specific speed calculated by standard formulae. For pulp pumps above 3% consistency semi open impeller is preferable. Impeller vane angles, number of vanes, vane curvatures are designed as per standards. Casing is considered as volute type. While designing of volute casing volute angle, throat area and tongue distance are designed as per standards. The shaft is designed as per power required by the pump. Designing of stuffing box and flexible coupling are done based on the shaft diameter by standard proportions. The thrust load and radial loads on the bearings are calculated and deep groove ball bearings are selected for withstanding that loads. The results obtained are compared with the operating parameters of the existing pump in our Palm oil plant and observed that the design is matching with the exist one.
{"title":"Design of Centrifugal Pump for Palm Fruit Pulp Handling in Palm Oil Plant.","authors":"V. Sreenivasulu, P. Rao, Anoop Kumar, B. Kumar","doi":"10.11127/IJAMMC.2013.02.058","DOIUrl":"https://doi.org/10.11127/IJAMMC.2013.02.058","url":null,"abstract":"A B S T R A C T For the design of pump the system resistance (total head) is calculated by considering head and capacity correction factor for 5% consistency of pulp. This factor is taken from data book. Power required and specific speed calculated by standard formulae. For pulp pumps above 3% consistency semi open impeller is preferable. Impeller vane angles, number of vanes, vane curvatures are designed as per standards. Casing is considered as volute type. While designing of volute casing volute angle, throat area and tongue distance are designed as per standards. The shaft is designed as per power required by the pump. Designing of stuffing box and flexible coupling are done based on the shaft diameter by standard proportions. The thrust load and radial loads on the bearings are calculated and deep groove ball bearings are selected for withstanding that loads. The results obtained are compared with the operating parameters of the existing pump in our Palm oil plant and observed that the design is matching with the exist one.","PeriodicalId":207087,"journal":{"name":"International Journal of Advanced Materials Manufacturing and Characterization","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127306058","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 : 2013-03-13DOI: 10.11127/IJAMMC.2013.02.053
B. Srinivas, Chadaram Srinivasu, B. Mahesh, Aqheel
In the recent years much attention has been paid to the development of ultra-fine grained and nanostructured materials due to their superior properties. Several severe plastic deformation (SPD) techniques have emerged in the recent years for producing ultra fine grained materials in bulk metals and alloys. Among the various SPD techniques proposed most of the methods are intended for processing bulk materials; very few methods like Equal-channel angular pressing (ECAP),High pressure torsion (HPT)technique ,constrained groove pressing (CGP) and repetitive corrugation and straightening (RCS) are capable of processing sheet materials. The requirement of stringent surface preparation the propensity of cracking due to de-lamination of accumulative roll bonded layersand formation of edge cracks limits the application of ARB processed sheets. Meanwhile in RCS process elongation of sheets causes strain inhomogeneity. The recently invented CGP process sans above mentioned problems is considered method for producing fine grained sheet materials for structural applications .A further defining feature of SPD techniques is that the preservation of shape is achieved due to special tool geometries which prevent the free flow of material and thereby produce a significant hydrostatic pressure. The presence of a high hydrostatic pressure, in combination with large shear strains, is essential for producing high densities of crystal lattice defects, particularly dislocations, which can result in a significant refining of the grains
{"title":"A Review on Severe Plastic Deformation","authors":"B. Srinivas, Chadaram Srinivasu, B. Mahesh, Aqheel","doi":"10.11127/IJAMMC.2013.02.053","DOIUrl":"https://doi.org/10.11127/IJAMMC.2013.02.053","url":null,"abstract":"In the recent years much attention has been paid to the development of ultra-fine grained and nanostructured materials due to their superior properties. Several severe plastic deformation (SPD) techniques have emerged in the recent years for producing ultra fine grained materials in bulk metals and alloys. Among the various SPD techniques proposed most of the methods are intended for processing bulk materials; very few methods like Equal-channel angular pressing (ECAP),High pressure torsion (HPT)technique ,constrained groove pressing (CGP) and repetitive corrugation and straightening (RCS) are capable of processing sheet materials. The requirement of stringent surface preparation the propensity of cracking due to de-lamination of accumulative roll bonded layersand formation of edge cracks limits the application of ARB processed sheets. Meanwhile in RCS process elongation of sheets causes strain inhomogeneity. The recently invented CGP process sans above mentioned problems is considered method for producing fine grained sheet materials for structural applications .A further defining feature of SPD techniques is that the preservation of shape is achieved due to special tool geometries which prevent the free flow of material and thereby produce a significant hydrostatic pressure. The presence of a high hydrostatic pressure, in combination with large shear strains, is essential for producing high densities of crystal lattice defects, particularly dislocations, which can result in a significant refining of the grains","PeriodicalId":207087,"journal":{"name":"International Journal of Advanced Materials Manufacturing and Characterization","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127260200","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 : 2013-03-13DOI: 10.11127/IJAMMC.2013.02.086
S. V. Ranganayakulu, R. Gowtham, M. Premkumar
Ultrasonic pulse echo method is approved for planar defect in the weld joint against radiography examination. The most important point in this evaluation is planar defects are effectively traced in radiography. Due to its excellent weldability, carbon steel is suitable for submerged arc welding. Ultrasonic and Radiography inspection is conducted for weld joint. During radiography method, planar defect (Lack of fusion) is detected and as verification ultrasonic pulse-echo method is also conducted to grasp planar defect. Primarily a demerit in radiography is shown as plus point in ultrasonic method. Secondarily, Lack of fusion is very common type of defect in weld defects. Lack of fusion is not notice as weld defect, as they are characterized as planar defect. As a final point, lack of fusion is not noticed by radiography examination, and may probably determine by ultrasonic method. The merits of Ultrasonic evaluation over X-ray Radiography inspection are discussed in these studies. Radiographic Testing (RT) or industrial radiography is a nondestructive testing (NDT) method of inspecting materials for hidden flaws by using the ability of short wavelength electromagnetic radiation (high energy photons) to penetrate various materials. Principle of radiography is differential absorptionand X-ray radiography can be used as source for detection of defectSince the amount of radiation emerging from the opposite side of the material can be detected and measured, variations in this amount (or intensity) of radiation are used to determine thickness or composition of material. Penetrating radiations are those restricted to that part of the electromagnetic spectrum of wavelength less than about 10 nanometer. Radiography defects such as planar cracks are difficult to detect using radiography; hence Ultrasonic is the preferred method for detecting this type of discontinuity.Ultrasonic pulse-waves of short wave length with center frequencies [3] ranging from 0.1-15 MHz and occasionally up to 50 MHz are launched into materials to detect internal flaws or to characterize materials.Radiography and ultrasonic inspection are the two generally non-destructive methods used in these investigations Non-destructive inspection methods that can [1] detect embedded flaws that are located well below the surface of the test part. Neither method is limited to the detection of specific types of internal flaws. In order to evaluate the stability of a casting component, the shape of a defect inside it is discriminating for the evaluation and acceptance criteria which shall be adopted. Defect shape is usually classified in two types; in volumetric defects, which the ratio between height and width is next to unity, and [7] in planar defects, whose width is indeed, very small with respect to the height. Radiography capability allows the inspection of internal mechanisms and enhances the detection of cracks and planar defects by manipulating the part to achieve the proper orientation f
{"title":"Why Multi shot should be conducted for Radiography Examination..","authors":"S. V. Ranganayakulu, R. Gowtham, M. Premkumar","doi":"10.11127/IJAMMC.2013.02.086","DOIUrl":"https://doi.org/10.11127/IJAMMC.2013.02.086","url":null,"abstract":"Ultrasonic pulse echo method is approved for planar defect in the weld joint against radiography examination. The most important point in this evaluation is planar defects are effectively traced in radiography. Due to its excellent weldability, carbon steel is suitable for submerged arc welding. Ultrasonic and Radiography inspection is conducted for weld joint. During radiography method, planar defect (Lack of fusion) is detected and as verification ultrasonic pulse-echo method is also conducted to grasp planar defect. Primarily a demerit in radiography is shown as plus point in ultrasonic method. Secondarily, Lack of fusion is very common type of defect in weld defects. Lack of fusion is not notice as weld defect, as they are characterized as planar defect. As a final point, lack of fusion is not noticed by radiography examination, and may probably determine by ultrasonic method. The merits of Ultrasonic evaluation over X-ray Radiography inspection are discussed in these studies. Radiographic Testing (RT) or industrial radiography is a nondestructive testing (NDT) method of inspecting materials for hidden flaws by using the ability of short wavelength electromagnetic radiation (high energy photons) to penetrate various materials. Principle of radiography is differential absorptionand X-ray radiography can be used as source for detection of defectSince the amount of radiation emerging from the opposite side of the material can be detected and measured, variations in this amount (or intensity) of radiation are used to determine thickness or composition of material. Penetrating radiations are those restricted to that part of the electromagnetic spectrum of wavelength less than about 10 nanometer. Radiography defects such as planar cracks are difficult to detect using radiography; hence Ultrasonic is the preferred method for detecting this type of discontinuity.Ultrasonic pulse-waves of short wave length with center frequencies [3] ranging from 0.1-15 MHz and occasionally up to 50 MHz are launched into materials to detect internal flaws or to characterize materials.Radiography and ultrasonic inspection are the two generally non-destructive methods used in these investigations Non-destructive inspection methods that can [1] detect embedded flaws that are located well below the surface of the test part. Neither method is limited to the detection of specific types of internal flaws. In order to evaluate the stability of a casting component, the shape of a defect inside it is discriminating for the evaluation and acceptance criteria which shall be adopted. Defect shape is usually classified in two types; in volumetric defects, which the ratio between height and width is next to unity, and [7] in planar defects, whose width is indeed, very small with respect to the height. Radiography capability allows the inspection of internal mechanisms and enhances the detection of cracks and planar defects by manipulating the part to achieve the proper orientation f","PeriodicalId":207087,"journal":{"name":"International Journal of Advanced Materials Manufacturing and Characterization","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129210213","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 : 2013-03-13DOI: 10.11127/IJAMMC.2013.02.057
A. AnithaLakshmi
{"title":"KBE approach towards design automation of Francis turbine spiral casing","authors":"A. AnithaLakshmi","doi":"10.11127/IJAMMC.2013.02.057","DOIUrl":"https://doi.org/10.11127/IJAMMC.2013.02.057","url":null,"abstract":"","PeriodicalId":207087,"journal":{"name":"International Journal of Advanced Materials Manufacturing and Characterization","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115913710","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 : 2013-03-13DOI: 10.11127/IJAMMC.2013.02.046
S. Gupta, K. N. Pandey
In this study, the joining of 6061-T4 Al alloy plates are carried out using friction stir welding (FSW) process and the process parameters are optimized using Taguchi method. The rotational speed, welding speed and axial force are the process parameters taken into consideration. The optimum process parameters are determined with reference to tensile strength of the joint. The results indicate that the rotational speed is highest significant parameter to deciding the tensile strength of the joint. The result shows that optimal values of process parameters are to get a maximum tensile strength of friction stir welded AA 6061 is 162 MPa. Friction stir welding (FSW) is a solid state joining process that invented at The Welding Institute (TWI) United Kingdom in 1991, is a viable technique for joining aluminium alloys that are difficult to fusion welding [1]. No defects are observed in FSW like porosity, alloy segregation and hot cracking, and welds are produced with good surface quality and thus no post weld cleaning is required [2]. There have been a lot of efforts to understand the effect of process parameters on material flow behavior, microstructure formation and mechanical properties of friction stir welded joints. The effect of some important process parameters on weld properties is major area for researchers [3-5]. In order to study the effect of FSW process parameters, most of follow the traditional experimental techniques, i.e. varying one parameter at a time while other parameters are constant, this conventional parametric design of experiment approach is time consuming. Taguchi statistical design is a powerful tool to identify significant factor from many factors by conducting relatively less number of experiments. Though research work applying Taguchi method on various processes have been reported in literatures [6-11], it appears that the optimization of FSW process parameters of 6061-T4 aluminium alloy using Taguchi method has not been reported yet. Considering the above facts, the Taguchi method is adopted to analyse the effect of each processing parameters (i.e. rotational speed, welding speed and axial force) for optimum tensile strength of friction stir welded joints of 6061-T4 aluminium alloy. Taguchi method Taguchi, a Japanese quality engineer widely recognized as the father of quality engineering [12], addresses quality in two main areas: off-line and on-line quality control. Both of these areas are very cost sensitive in the decisions that are made with respect to the activities in each. Off-line quality control refers to the improvement in quality in the product and process development stages. On-line quality control refers to the monitoring of current manufacturing processes to verify the quality levels produced [13]. The most important difference between a classical experimentaldesign and a Taguchi methodbased robust design technique is that the former tends to focus solely on the mean of the quality characteristic, while the
本研究采用搅拌摩擦焊(FSW)工艺对6061-T4铝合金板进行了焊接，并采用田口法对工艺参数进行了优化。考虑了旋转速度、焊接速度和轴向力等工艺参数。根据接头的抗拉强度确定了最佳工艺参数。结果表明，转速是决定接头抗拉强度的最重要参数。结果表明，工艺参数的最佳取值为AA 6061搅拌摩擦焊的最大抗拉强度为162 MPa。搅拌摩擦焊(FSW)是1991年由英国焊接研究所(The welding Institute, TWI)发明的一种固态连接工艺，是一种可行的连接难以熔焊铝合金的技术[1]。FSW无气孔、合金偏析、热裂等缺陷，焊缝表面质量好，无需焊后清洗[2]。为了了解工艺参数对搅拌摩擦焊接接头材料流动行为、微观组织形成和力学性能的影响，人们做了大量的工作。一些重要的工艺参数对焊缝性能的影响是研究人员研究的重点领域[3-5]。为了研究FSW工艺参数的影响，大多采用传统的实验方法，即每次改变一个参数，而其他参数保持不变，这种传统的参数化实验设计方法耗时长。田口统计设计是一种强大的工具，可以通过进行相对较少的实验，从许多因素中识别出重要因素。虽然文献中已经报道了将田口法应用于各种工艺的研究工作[6-11]，但使用田口法优化6061-T4铝合金FSW工艺参数的研究似乎尚未见报道。考虑到以上事实，采用田口法分析了各工艺参数(转速、焊接速度和轴向力)对6061-T4铝合金搅拌摩擦焊接接头最佳抗拉强度的影响。被公认为质量工程之父的日本质量工程师田口(Taguchi)[12]从离线和在线质量控制两个主要领域阐述了质量问题。这两个领域在作出与各自活动相关的决策时都对成本非常敏感。离线质量控制是指在产品和工艺开发阶段的质量改进。在线质量控制是指对当前制造过程的监控，以验证所生产的质量水平[13]。经典实验设计和基于田口方法的稳健设计技术之间最重要的区别是，前者倾向于只关注质量特征的平均值，而后者则考虑兴趣特征方差的最小化。虽然田口方法由于几个主要的局限性而引起了许多批评，但它能够有效地解决单响应问题。
{"title":"Application of Taguchi Method for Optimization of Friction Stir Welding Process Parameters to Joining of Al Alloy","authors":"S. Gupta, K. N. Pandey","doi":"10.11127/IJAMMC.2013.02.046","DOIUrl":"https://doi.org/10.11127/IJAMMC.2013.02.046","url":null,"abstract":"In this study, the joining of 6061-T4 Al alloy plates are carried out using friction stir welding (FSW) process and the process parameters are optimized using Taguchi method. The rotational speed, welding speed and axial force are the process parameters taken into consideration. The optimum process parameters are determined with reference to tensile strength of the joint. The results indicate that the rotational speed is highest significant parameter to deciding the tensile strength of the joint. The result shows that optimal values of process parameters are to get a maximum tensile strength of friction stir welded AA 6061 is 162 MPa. Friction stir welding (FSW) is a solid state joining process that invented at The Welding Institute (TWI) United Kingdom in 1991, is a viable technique for joining aluminium alloys that are difficult to fusion welding [1]. No defects are observed in FSW like porosity, alloy segregation and hot cracking, and welds are produced with good surface quality and thus no post weld cleaning is required [2]. There have been a lot of efforts to understand the effect of process parameters on material flow behavior, microstructure formation and mechanical properties of friction stir welded joints. The effect of some important process parameters on weld properties is major area for researchers [3-5]. In order to study the effect of FSW process parameters, most of follow the traditional experimental techniques, i.e. varying one parameter at a time while other parameters are constant, this conventional parametric design of experiment approach is time consuming. Taguchi statistical design is a powerful tool to identify significant factor from many factors by conducting relatively less number of experiments. Though research work applying Taguchi method on various processes have been reported in literatures [6-11], it appears that the optimization of FSW process parameters of 6061-T4 aluminium alloy using Taguchi method has not been reported yet. Considering the above facts, the Taguchi method is adopted to analyse the effect of each processing parameters (i.e. rotational speed, welding speed and axial force) for optimum tensile strength of friction stir welded joints of 6061-T4 aluminium alloy. Taguchi method Taguchi, a Japanese quality engineer widely recognized as the father of quality engineering [12], addresses quality in two main areas: off-line and on-line quality control. Both of these areas are very cost sensitive in the decisions that are made with respect to the activities in each. Off-line quality control refers to the improvement in quality in the product and process development stages. On-line quality control refers to the monitoring of current manufacturing processes to verify the quality levels produced [13]. The most important difference between a classical experimentaldesign and a Taguchi methodbased robust design technique is that the former tends to focus solely on the mean of the quality characteristic, while the ","PeriodicalId":207087,"journal":{"name":"International Journal of Advanced Materials Manufacturing and Characterization","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128900188","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 : 2013-03-13DOI: 10.11127/IJAMMC.2013.02.083
M. Venkateswarlu, B. Rajinikanth
Magneto Rheological fluids are made of soft magnetic particles dispersed in a carrier fluid. Here cobalt ferrite based magneto rheological fluids were made from the nanopowders of cobalt ferrite obtained from the simple wet chemical synthesis from the metal salts dispersed in the Polyvinyl Pyrrolidone (PVP). The nanoparticle Cobalt ferrite was heat treated at 600C for five and half hours in a furnace. The sample was characterized by using Xray Diffraction(XRD), Scanning Electron Microscopy(SEM) and Energy Dispersive X-ray Analysis (EDAX). Cobalt ferrite which is mixed with different weight percent solutions of PVP to make the Magneto Rheological fluid samples. These samples were characterized by the Rheometere in both oscillatory, rotational measurement conditions. The variation in viscosity with respect to the magnetic field, storage and loss modulus and damping of the samples were measured and presented in this paper. Magneto rheological (MR) fluids are dispersions of fine magnetically soft, multi domain particles. MR fluids exhibit rapid, reversible and significant changes in their viscosity and shear modulus when subjected to external magnetic field. The apparent yield strength of these fluids can be changed significantly within milliseconds by the application of an external magnetic field [13]. MR fluid devices are being used and developed for shock absorbers, clutches, brakes, and seismic dampers[4].The physical properties of an MR fluid change as a nonlinearly time varying function of applied field driven particle alignment with the typical hysteresis of magnetic materials [5]. The external magnetic field applied to the MR fluid causes changes in all physical properties of the fluid, such as Electrical conductivity, thermal conductivity, permeability, as well as viscosity[3, 68].MR fluid viscosity is very much sensitive to changes on external magnetic fields. Viscosity depends on particle concentration, particle shape, size and material in combination with several carrier fluids [5]. In the current MR devices control of the viscosity is performed by the direct excitation of the external magnetic field. The non-linear, hysteretic time varying response of the fluid is an obstacle to precision viscosity control despite fast response time. Most of the times the MR fluids encounter different operating conditions in which their visco elastic properties plays a vital role. Therefore an understanding of the dynamic behavior of the MR fluid will be crucial for the design[9]. Most of the MR devices operate under dynamic conditions (vibrators, dampers, etc) thus small amplitude oscillatory and rotational measuring rheometer provide more useful results [10]. Keeping these points in view, in the present study we have made an MR fluid which is comprising of magnetically soft Co ferrite nano powders weight percent solutions of PVP and studied their oscillational and rotational viscoelastic properties and results are presented in this paper.
{"title":"Magneto Rheological properties of Cobalt ferrite based MR fluids","authors":"M. Venkateswarlu, B. Rajinikanth","doi":"10.11127/IJAMMC.2013.02.083","DOIUrl":"https://doi.org/10.11127/IJAMMC.2013.02.083","url":null,"abstract":"Magneto Rheological fluids are made of soft magnetic particles dispersed in a carrier fluid. Here cobalt ferrite based magneto rheological fluids were made from the nanopowders of cobalt ferrite obtained from the simple wet chemical synthesis from the metal salts dispersed in the Polyvinyl Pyrrolidone (PVP). The nanoparticle Cobalt ferrite was heat treated at 600C for five and half hours in a furnace. The sample was characterized by using Xray Diffraction(XRD), Scanning Electron Microscopy(SEM) and Energy Dispersive X-ray Analysis (EDAX). Cobalt ferrite which is mixed with different weight percent solutions of PVP to make the Magneto Rheological fluid samples. These samples were characterized by the Rheometere in both oscillatory, rotational measurement conditions. The variation in viscosity with respect to the magnetic field, storage and loss modulus and damping of the samples were measured and presented in this paper. Magneto rheological (MR) fluids are dispersions of fine magnetically soft, multi domain particles. MR fluids exhibit rapid, reversible and significant changes in their viscosity and shear modulus when subjected to external magnetic field. The apparent yield strength of these fluids can be changed significantly within milliseconds by the application of an external magnetic field [13]. MR fluid devices are being used and developed for shock absorbers, clutches, brakes, and seismic dampers[4].The physical properties of an MR fluid change as a nonlinearly time varying function of applied field driven particle alignment with the typical hysteresis of magnetic materials [5]. The external magnetic field applied to the MR fluid causes changes in all physical properties of the fluid, such as Electrical conductivity, thermal conductivity, permeability, as well as viscosity[3, 68].MR fluid viscosity is very much sensitive to changes on external magnetic fields. Viscosity depends on particle concentration, particle shape, size and material in combination with several carrier fluids [5]. In the current MR devices control of the viscosity is performed by the direct excitation of the external magnetic field. The non-linear, hysteretic time varying response of the fluid is an obstacle to precision viscosity control despite fast response time. Most of the times the MR fluids encounter different operating conditions in which their visco elastic properties plays a vital role. Therefore an understanding of the dynamic behavior of the MR fluid will be crucial for the design[9]. Most of the MR devices operate under dynamic conditions (vibrators, dampers, etc) thus small amplitude oscillatory and rotational measuring rheometer provide more useful results [10]. Keeping these points in view, in the present study we have made an MR fluid which is comprising of magnetically soft Co ferrite nano powders weight percent solutions of PVP and studied their oscillational and rotational viscoelastic properties and results are presented in this paper.","PeriodicalId":207087,"journal":{"name":"International Journal of Advanced Materials Manufacturing and Characterization","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126093355","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 : 2013-03-13DOI: 10.11127/IJAMMC.2013.02.074
D. Raju, Y. Vijaya, V. Sreenivasulu, G. Rao
{"title":"Design of Centrifugal Pump for Pulp Handling in Paper Plant.","authors":"D. Raju, Y. Vijaya, V. Sreenivasulu, G. Rao","doi":"10.11127/IJAMMC.2013.02.074","DOIUrl":"https://doi.org/10.11127/IJAMMC.2013.02.074","url":null,"abstract":"","PeriodicalId":207087,"journal":{"name":"International Journal of Advanced Materials Manufacturing and Characterization","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127786296","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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