ISSN Number

ISSN: 2147-9690

Turkish Journal of Engineering, Sciences and Technology

2014 Volume 2 Issue 4

 

Barreling, Fracturing and Deformation Characteristics of Sintered Aluminum Powder

Shrikant Jainaa,*, R. K. Ranjanb, and Surrender Kumarc

a, bDepartment of Mech. Engg., GGITS, Jabalpur, India

cG.L.A. University, Mathura, India

Abstract

The industrial processing of sintered powder preform has been developed for manufacturing various engineering components. The present investigation has been undertaken with a view to studying the barreling, fracture mechanism and deformation characteristics during the cold forging of sintered aluminum preform at low strain rates. Experiments have been conducted and measurements made on the development of barreling during cold forging on preforms of three aspect ratios with and without lubricated end conditions. The radius of curvature of the bulge measured was found to conform to the calculated one using the experimental data with the assumption that the curvature of bulge followed the form of circular arc. Experimentally obtained flow load and plastic work done are in good agreement with theoretical estimates. The deformation characteristics and fracture mechanism of metal powder preform has been analyzed and discussed critically. Crack formation at the free surface has also been examined. Results are presented graphically.

Keywords: Sintered preform, Barreling, Fracture mechanism, Deformation characteristics

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Comparative Analysis of QRR and AODV Based Relaying System

Arunmozhi Sinouvassanea, Nagarajan Gb

aSCSVMV University, Kancheepuram, Tamil Nadu , India.

bDepartment of ECE, Pondicherry Engineering College, Pondicherry, India

Abstract

In Cooperative communication, multiple single-antenna relay terminals assist the source in transmitting information to the destination and provide a very effective strategy for improved spatial diversity of communication. A relay strategy, Quantized Reliability Relaying (QRR) is implemented in a semi blind scenario, considering multiple sources and destinations assisted by a set of relays. The reliability of the relays is partitioned into three levels in accordance with the log-likelihood ratio (LLR) of the received signal and forward regenerative symbol to the destination if quantized reliability falls within the “send +1” and “send-1” region. The assumption is that a relay gets the perfect channel state information (CSI) from the source and the destination node can obtain the perfect CSI from the other relays, which is a semi blind scenario.  The CSI of the link between the source and the participating relays is not required by the destination receiver. The performance parameters of QRR namely delay, throughput and delivery ratio are plotted for various packet sizes. It is compared with the existing protocol, AODV. In order to enhance the performance, it is extended to higher order modulation schemes and compared using NS-2 tool.

Keywords: Cooperative communication, Channel State Information (CSI), Spatial diversity, Quantized Reliability Relaying, Log-likelihood ratio, AODV

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Quality prediction of resistance spot welding using ultrasonic testing

Abbas Moghanizadeha

a Department of Mechanic, Shirvan Branch, Islamic Azad University, Shirvan, Iran

Abstract     
Ultrasonic non-destructive techniques for evaluation of the mechanical properties of resistance spot welding are presented. The aim of this study is to develop the capability of the ultrasonic techniques as an efficient tool in the assessment of the welding characterization. Previous researches have indicated that the measurements of ultrasonic attenuation are sensitive to grain- size variations in an extensive range of metallic alloys. Other researchers have frequently described grain sizes which are able to have significant effects on the physical characteristics of the material. This research provides a novel method to estimate the tension-shear strengths of the resistance spot welding directly from the ultrasonic attenuation measurements. The effects of spot welding parameters on the ultrasonic waves are further investigated.  The results confirm that it is possible to determine the spot welding parameters for individual quality by using ultrasonic test.

Keywords: Spot Welding; Shear-tension strength; Ultrasonic attenuation

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Data Mining on production strategies of Indian Bauxites

Amiya Sahooa, Satya Sai Srikantb, R Bhima Raoc

aAryan Institute of Engineering and Technology, BPUT University, Bhubaneswar, Odisha, India
bDepartment of Electronics and Communication Engineering, SRM University, Modinagar, Ghaziabad, 201204, India
cInstitute of Minerals and Materials Technology, Council of Scientific and Industrial Research, Bhubaneswar, Odisha, India

Abstract     
The present paper deals with the retrieval of the data from the mineral year books of Indian Bureau of Mines and Government of India web sites with particular reference to the production strategies of Indian bauxites and its analysis for dictating the India’s future out look. The data reveal that Indian refractory grade bauxite is very limited and it is mostly restricted in Gujarat state where as the metallurgical grade bauxite is abundant but mostly consumed in house industries with limited exports. In view of this, on the basis of data mining information it is recommended to Government R & D organizations and public sectors to take up innovative research on beneficiation or up gradation of low grade bauxites as well as alumina bearing weathered khondalite rocks suitable for different industrial applications.

Keywords: Data Mining, Bauxite, Refractory, Metallurgical, Response surface methodology, export, import, internal consumption

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Network Reconfiguration and Capacitor Placement for Optimal Operation of Radial Distribution System

Sudha Rani Donepudia, Subrahmanyam N.a, Sydulu M.a

aDepartment of Electrical Engineering, National Institute of Technology Warangal, Warangal, India

Abstract     
In this paper, the feeder reconfiguration and capacitor placement problem are solved to find the optimal operation of the distribution system. These are the complex combinatorial optimization process geared towards finding optimal operation of the distribution system. To determine the optimal operation of the distribution system, minimization of total active power loss and maximum node voltage deviation are considered as the main objectives. To solve this multi-objective problem, a goal optimization technique along with self adaptive harmony search optimization algorithm is implemented. The proposed algorithm is tested on standard IEEE 69-Bus Radial Distribution System and 84 Bus Practical Distribution Network Taiwan Power Company (TPC).  Backward/ Forward sweep load flow algorithm is used for load flow analysis of radial distribution system. To find the effectiveness of the simultaneous feeder reconfiguration and capacitor placement, the results are taken for different loading conditions: with base load (100%) and 120% load.  In order to prove the parameter independency of this algorithm, it is tested for 10 different combinations of parameters. For the comparison purpose real coded Genetic Algorithm (GA) and Music Based Harmony Search Algorithm (MBHSA) are also coded for this problem; it is observed that the proposed method performed well and results in a significant loss reduction with good voltage profile when compared to GA and MBHSA.

Keywords: Feeder reconfiguration, Capacitor placement, Harmony search algorithm, Power loss, Goal optimization, Self adaptive

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Structural And Contact Analysis  Of A 3-Dimensional Disc-Pad Model With And Without Thermal Effects

Belhocine Alia, Mostefa Bouchetarab, Nouby Mahdi Ghazalib, Oday Ibraheem Abdullahc

aFaculty of Mechanical Engineering, University of Sciences and the Technology of Oran, USTO 31000 ORAN, Algeria
bMechanical Engineering Dept., Faculty of Engineering, South Valley University, Qena-83523, Egypt
cSystem Technology and Mechanical Design Methodology, Hamburg University of Technology, Germany.

Abstract     
The motivation of this work is to identify thermal effects on the structural and contact behaviour of a disc-pad assembly using a finite element approach. The first analysis is performed on the disc-pad model without the presence of thermal properties. Structural performance of the disc-pad model such as deformation and von Mises stress is predicted. Next, thermomechanical analysis is performed on the same disc-pad model with the inclusion of convection, adiabatic and heat flux elements. The prediction results of temperature distribution, deformation, stress and contact pressure are presented. Comparison of the structural performance between the two analyses (mechanical and thermomechanical) is also made. From this study, it can assist brake engineers to choose a suitable analysis in order to critically evaluate structural and contact behaviour of the disc brake assembly.

Keywords: Finite element, Disc-pad model, Temperature, Deformation, Stress, Contact pressure

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