Papers Posted on - Aug / 2014


Author Name K. Vishwanath Allamraju,K. Srikanth
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DOI http://dx.doi.org/10.11127/ijammc.2014.08.07
Paper Title Review And Scope Of Scavenging micro Energy using Piezoelectric materials
Abstract
This paper reviews the energy harvesting for micro level devices such as mobile phones, low powered signal lights and energy storage batteries by using Lead Zirconite Titanite (PZT) with the help of vibration on cantilever beams and batteries. Recent advances on micro power portable devices require limitless battery life for improving performance. A lot of energy is being wasted which is around us and also research has been conducted to develop energy harvesting devices by using PZT materials. This paper gives innovative ideas to develop energy harvesting devices for future scientific community.
Keywords
Piezo electricity, Energy Harvesting, Vibration PZT material
Author Name Shashi Prakash Dwivedi, Satpal Sharma, Raghvendra Kumar Mishra
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DOI http://dx.doi.org/10.11127/ijammc.2014.08.01
Paper Title A356 Aluminum Alloy and applications- A Review
Abstract
A356 alloys are ever more accepted in aircraft and automobile due to their high strength-to-weight ratio and its thixotropic structure (designated SSM-A356). Its specific tensile strength and rigidity are superior to other Aluminum alloys. These qualities lead to less vehicle and aircraft weight and better fuel economy. A356 based alloys have been developed with significant ductility, strength, elongation, hardness and toughness at room temperature in as-cast state. Therefore, in the present work an attempt has been made to review A356-alloy based systems and it application that possesses exceptionally high ductility as well as good mechanical strength
Keywords
A356 alloy, A356 alloys applications, Mechanical properties of A356 alloy.
Author Name R. Keshavamurthy, S.Suhael Ahmed, A.Mudashi Laxman, N.H.Anil Kumar, M.N.Shashidhara, Y.Vimarshan Red
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DOI http://dx.doi.org/10.11127/ijammc.2014.08.02
Paper Title Tribological properties of Hot forged Al2024-TiB2 in-situ composite
Abstract
Al2024-TiB2 in-situ composite was fabricated by liquid metallurgy route using Al-Titanium and Al-Boron master alloys. The developed composites were subjected to hot forging at a temperature of 500oC using a 200T hydraulic hammer. Microstructure studies, X-ray diffraction studies(XRD), grain size analysis, microhardness and dry friction and wear tests were carried out on as cast and hot forged matrix alloy and its composites. Pin on disc type machine was employed to perform friction and wear tests over a load range of 20-100N and sliding velocities of 0.314-1.57m/s. Microstructure and XRD studies reveal presence of fine TiB2 particles in both as cast and hot forged condition. It is observed that, both as cast and hot forged composites do exhibit significant grain refinement. When compared with as cast matrix alloy and its composite, hot forged alloy and its composite exhibits higher extent of grain refinement. Both as cast and hot forged composites exhibit improved microhardness, wear resistance and lower coefficient of friction when compared with the unreinforced alloy under identical test conditions.
Keywords
Aluminum alloy, In-situ composite, forging, Coefficient of friction, Wear.
Author Name Medikondu Nageswararao K.Narayanarao G.Ranagajanardhana
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DOI http://dx.doi.org/10.11127/ijammc.2014.08.04
Paper Title Machines and AGVs Scheduling in Flexible Manufacturing System With Mean Tardiness Criterion
Abstract
Optimum Automated Guided Vehicles (AGVs) operation plays a crucial role in improving the performance of Flexible Manufacturing System (FMS). One of the main elements in the implementation of AGV is task scheduling. This will enhance the productivity, Minimize delivery cost and optimally utilize the entire fleet. This enhance article Deals with Hybrid Genetic Vehicle Heuristic Algorithm (HGVHA) for simultaneous Scheduling of machines and AGVs adopting minimization of makespan and minimization of mean tardiness. The method is found to provide better solution
Keywords
Scheduling, FMS, AGVs, Vehicle Heuristic Algorithm Genetic Algorithm
Author Name Shouvik Ghosh, Prasanta Sahoo and Goutam Sutradhar
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DOI http://dx.doi.org/10.11127/ijammc.2014.08.03
Paper Title Wear Characteristics Optimization of Al-7.5%Sic Metal Matrix Composite Using Taguchi Method
Abstract
In the present paper an attempt has been made to optimize the wear behaviour of Al-7.5%SiC metal matrix composite using Taguchi Method. Al-7.5%SiC metal matrix composite is synthesized using LM6 aluminium alloy as matrix metal and Silicon carbide as reinforcement using Stir casting process. Using L27 orthogonal array and Taguchi method the optimization of wear behaviour of the composite is carried out. The L27 orthogonal array is constructed using three levels of each tribological testing parameter Load (L), Sliding Speed (S) and Time (T). The wear tests are conducted in a Multi-Tribotester (DUCOM TR-25) using a block on roller arrangement at various combinations of the testing parameters. The analysis of the result is carried out using wear depth as system response. Furthermore, ANOVA analysis is carried out to find out the significant test parameters and their interactions affecting the wear behaviour of the composite. Scanning electron microscopy (SEM) is carried out to identify the wear mechanism.
Keywords
Al-sic; Metal matrix composite; Wear; Optimization; Taguchi method.
Author Name S. Jyothirmai, I. Aparna Devi, I. Sudhakar and R. Ramesh
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DOI http://dx.doi.org/10.11127/ijammc.2014.08.05
Paper Title Hardness Prediction Model for En Grade Steels Subjected to Different Heat Treatment Processes
Abstract
It is more often witnessed that the hardness of the steel depends on environment conditions, type of heat treatment adopted, composition and morphology. The selection of process parameters plays a vital role in obtaining the required hardness. It opens up scope for extensive research to map the relationship between the process parameters which is coherent with hardness of the steel. In the present investigation, an attempt has been made to accomplish this task with the help of a support vector machines (SVM) model for mapping process parameters with hardness. The basis for the development of SVM prediction model for the hardness at any condition within the conducted domain has been obtained by the data base comprising of set of input variable such as process, temperature, metal grade and output variable such as hardness. This is achieved by conducting several experimentations at different temperatures for various heat treatment processes such as annealing, normalizing, hardening and quenching using two different grades of steels namely EN19 and EN24 (with and without nickel). The presence of Nickel, which is an austenite stabilizer, promotes the formation of needle like fine grain martensite phase and its effect on hardness has been reported.
Keywords
Support vector machines, Hardness, Regression, Hardening
Author Name Sarmila Sahoo
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DOI http://dx.doi.org/10.11127/ijammc.2014.08.06
Paper Title Laminated composite stiffened saddle shells with cutouts under free vibration – a finite element approach
Abstract
Finite element method has been applied to solve free vibration problems of laminated composite stiffened saddle shells with cutouts employing the eight-noded curved quadratic isoparametric element for shell with a three noded beam element for stiffener formulation. Specific numerical problems of earlier investigators are solved to compare their results. Moreover, free vibration problem of stiffened saddle shells with different size and position of the cutouts with respect to the shell centre for different edge constraints are examined to arrive at some conclusions useful to the designers. The results are presented in the form of figures and tables. The results are further analyzed to suggest guidelines to select optimum size and position of the cutout with respect to shell centre considering the different practical constraints.
Keywords
Laminated composites; Stiffened saddle shell; Cutout; Free vibration; Finite element