| 1 |  | Correlation of Mechanical Properties of Friction Welded Low Carbon Steel to Stainless Steel Joints with Microstructure and Fractography | Steel joints are used in the chemical, nuclear and defence sectors.Some research work has been done on welding of similar as well as dissimilar steel joints. Generally, similar steel joints can be joined by fusion welding techniques like TIG and MIG welding, but in case of dissimilar welds, solid state welding has to be gone in for because of thermal mismatch. In this paper, a low carbon steel-stainless steel combination has been welded using friction welding.The welding parameters include friction pressure, upset pressure, speed of rotation and burn-off length. Speed of rotation has been kept constant in this case. Later, effect of speed of rotation alone with other parameters fixed is reported. Mechanical properties like tensile strength, impact strength and bend angle have been determined and the properties varied depending on friction welding parameters. Microstructures and SEM micrographs have been shown to explain the results. |
| 2 | | Finite Element Investigations of Material Models in the Machining Simulation of AA6082(T6) Alloy | Aluminium alloys are widely used in the structural industry due to their inherent high strength to low weight ratio. In particular, AA 6082 (T6) is an AlSi1MgMn alloy known for its superior anti-corrosion and anti-oxidation properties combined with its excellent formability and machinability. The T6 temper in particular possesses higher tensile strength than other types. In this paper, a finite element analysis (FEA) of machining of AA 6082 (T6) is presented.Orthogonal cutting experiments were carried out on a tube of AA 6082(T6) material with a cutting speed of 82 m/min and feed rates of 0.102, 0.159, 0.205 and 0.26 mm/rev. The Johnson-Cook (J-C) and Zerilli-Armstrong (Z-A) constitutive equations were implemented in the FE (finite element) code to study the behaviour of AA 6082 (T6) during the machining process. The predicted values for cutting force, chip thickness, shear angle and shear strain were compared with experiments and have been presented in this paper. The FE results for effective stress, strain, strain rate and temperature were analyzed. The simulation results showed good predictive qualities for the J-C model marginally better than the Z-A model for most parameters. |
| 3 | | Finite Element Simulation of Forging of Aluminium Truncated Conical Sintered Preforms | The present paper deals with the three dimensional finite element simulation of sinter-forging of aluminium truncated conical preforms using DEFORM-3D software, which considers the heterogeneous deformation due to bulging of preform slant sides, composite die-workpiece interfacial friction conditions, preform densification along with compression and inertia effects. The variation of effective strain, effective stress, effective strain rate, forging load and internal energy dissipation with sinter-forging time were analyzed.The distribution of total displacement, effective stress and effective strain in form of contours on the preform surface were obtained. It was found that effective stress, effective strain, effective strain rate and internal energy dissipation increases with the sinter-forging time and die velocity. It was also noted that effective stress and strains were higher at the edges of preform. |
| 4 | | Multi-response Optimization of Process Parameters in Cold Chamber Pressure Die Casting | The present study aims at investigating the effect of various process parameters in a high pressure die casting process on the properties of aluminum alloy LM 6 and optimize the parameters using multi-response optimization methodology. Four process parameters, namely pouring temperature of the molten metal, injection pressure, coating type and cooling method were varied during the study. The output responses measured after casting were the material density, hardness and the surface roughness of the cast part.Injection pressure was observed to be the most significant factor and pouring temperature was observed to be the least significant factor. The empirical modelling equation was developed that can be used to predict the response values during experimental trials involving similar process conditions. |
| 5 | | Parametric Analysis on Ultrasonic Drilling of Alumina based on Taguchi Method | The ultrasonic machining is a mechanical material removal process which has great potential for machining hard and brittle materials, such as, ceramics, semiconductors and glasses etc. The surface finish of the hole surface drilled by USM can be improved by optimal control of the process parameters. This paper presents the experimental investigation for selecting optimum combination of process parameters, such as, abrasive grit size, slurry concentration, power supply and feed rate in ultrasonic drilling of high alumina (99% Al2O3). Taguchi method with orthogonal array L9(34) has been applied for designing the experimental plan.The surface roughness of drilled holes have been analyzed and optimal settings of process parameters have been determined to achieve the minimum value of surface roughness of holes during ultrasonic drilling of high alumina. The additive models for optimal prediction are validated after conducting the confirmation experiments. |
| 6 | | Wear and Frictional Characteristics of Some Polymeric Materials for Gears used in Machine Tools | Polymers and composites are being extensively used in various tribo systems, such as, bearings, gears, etc where liquid lubricant cannot be used because of various constraints. An attempt has been made in this paper to study the wear and frictional characteristic of some of these materials under various operating conditions.Authors developed a generalized empirical relationship for wear and coefficient of friction of such materials under variable loading and duration of sliding. Based on the experimental observations, it is possible to arrive at a decision in regard to possible combinations of pressure and velocity of sliding, so as to contain the wear within a specific limiting value. |
Monday, October 17, 2011
PRODUCTION ENGG. Volume:92 2011 SEP
Thursday, October 13, 2011
DEFENCE SCIENCE JOURNAL-VOL 61, NO 5 SEPTEMBER 2011
GUEST EDITORIAL
| Information Sets and Information Processing | |
| Madasu Hanmandlu | 405-407 |
SPECIAL ISSUE PAPERS
| Digital Watermarking Security | |
| Jonathan Blake, Shahram Latifi | 408-414 |
| Content-based Image Retrieval by Information Theoretic Measure | |
| Madasu Hanmandlu, Anirban Das | 415-430 |
| Face Recognition using Segmental Euclidean Distance | |
| Farrukh Sayeed, Madasu Hanmandlu, A Q Ansari | 431-442 |
| Automatic Selection of Initial Points for Exploratory Vessel Tracing in Fluoroscopic Images | |
| Farsad Zamani Boroujeni, Rahmita Wirza, O K Rahmat, Norwati Mustapha, Lilly Suriani Affendey, Oteh Maskon | 443-451 |
| Enhancement and Restoration of Microscopic Images Corrupted with Poisson's Noise Using a Nonlinear Partial Differential Equation-based Filter | |
| Rajeev Srivastava, JRP Gupta, Harish Parthasarathy | 452-461 |
| High Dynamic Range Color Image Enhancement Using Fuzzy Logic and Bacterial Foraging | |
| Om Prakash Verma, V K Madasu, V Shantaram | 462-472 |
| Statistical Characterisation of Speckle in Clinical Echocardiographic Images with Pearson Family of Distributions | |
| Abhinav Gupta, Karmeshu . | 473-478 |
| Image Fusion Technique using Multi-resolution Singular Value Decomposition | |
| VPS Naidu | 479-484 |
RESEARCH PAPERS
| Air Object Height Estimation with 2-D Radars using Fuzzy Logic | |
| SGK Murthy, M.V.R. Murthy | 485-490 |
| Microscopic TV Holography for Microsystems Metrology | |
| Upputuri Paul Kumar, U. Somasundaram, M.P. Kothiyal, Nandigana Krishna Mohan | 491-498 |
| The Effect of Woven Structures on the Vibration Characteristics of Glass Fabric/Epoxy Composite Plates | |
| Xu Lei, Wang Rui, Yong Liu, Li Jin | 499-504 |
| Bulk Disposal of Unserviceable Toxic Cresylic Acid Waste Using Polymerisation Technique | |
| Pramod Kumar Rai, Amit Saxena, Ashok Singh Rawat, Vivek Kumar, Mritunjay Pandit, Jagdish Chandra Kapoor | 505-511 |
Tuesday, October 11, 2011
The Indian Concrete Journal-August 2011
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| EDITORIALNEWS & EVENTS POINT OF VIEW: Need for guidelines to address environmental concerns in a ready mixed concrete plant -- Sudhir Misra and Shweta Varsney POND ASH CONCRETE: Influence of pond ash as fine aggregate on strength and durability of concrete -- B. Kondraivendhan, Velchuri Sairam and K. Nandagopal NEW PRODUCT FEATURE: Microtechnology for high performance concrete -- Ajay Pathik, A.N. Vyasa Rao and Cyrus Dordi GYPSUM: Global trends in gypsum industry -- Manjit Singh | |||||
212.Indian Journal of Pure and Applied Physics-August 2011
VOLUME 49 | NUMBER 8 | AUGUST 2011 | |
CODEN:IJOPAU 49(8) 505-578 | ISSN:0019-5596 (Print); 0975-1041 (Online) | ||
CONTENTS | |
Atomic and Molecular Physics | |
Temperature dependent luminescence in erbium-doped zinc tellurite glass: A model investigation | 509 |
Molecular structure and vibrational spectroscopic studies of 1-nitro-4-(trifluoromethoxy) benzene by density functional method | 516 |
Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics and Fluid Dynamics | |
Application of laser speckle technology in solar wafer roughness inspection system | 523 |
Condensed Matter: Structural, Mechanical and Thermal Properties | |
Synthesis, growth and characterization of a new non-linear-optical crystal: Copper cobalt thiocyanate | 531 |
Study of thermoelastic properties of liquid toluene | 535 |
Effect of fluoride on the crystallization and spectral properties of cholesterol | 539 |
Effect of Sb incorporation on the density of defect states in a-Se90In10 glassy alloy | 545 |
Thermodynamic behaviour of methylmethacrylate in methanol, p-dioxane and cyclohexane | 550 |
Hybrid nano-crystalline TiO2 solar cell with copper phthalocyanine as sensitizer and hole transporter | 557 |
Synthesis, crystal structure and characterization of Na2.02Ag5.98[GaSiO4]6(NO2)2 and Na3.12K4.88[GaSiO4]6(NO2)2 sodalites | 563 |
569 | |
570 | |
571 | |
Authors for correspondence are indicated by (*)
Keyword Index
1-nitro-4-(trifluoromethoxy) benzene 516
Additives 539
Binary liquid mixture 550
Bulk heterojunction 557
Chalcogenide glasses 545
Characterization 531
Cholesterol 539
Compressibility 535, 550
Cyclohexane 550
Density of defect states 545
DFT calculation 516
Fluorescence 557
Fluorides 539
FTIR spectroscopy 539
FTIR 516
FT-Raman 516
Gallosilicate 563
Khasare’s equation of state 550
Laser speckle technology 523
Liquid toluene 535
Luminescence 509
Methanol 550
Methylmethacrylate 550
Molar volume 550
Multi-phonon relaxation 509
Nitrite derivatives 563
Non-linear optical materials 531
Non-radiative 509
Optical inspection system 523
p-Dioxane 550
Photovoltaic effect 557
Pseudospinodal mode 535
Quenching 509, 557
Quantum efficency 509
Reitveld refinement 563
Roughness 523
Second harmonic generation 531
Slow evaporation technique 531
Solar wafer 523
Space charge limited conduction 545
Speckle pattern 523
Thermal expansivity 535
Thin films 545
Up-conversion 509
UV-DRS 563
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