Comparison of barreling in unlubricated truncated cone billets during cold upset forging of various metals

202-208Experiments have been carried out to generate data on cold upset forging of unlubricated annealed commercially pure aluminium, copper and zinc solids of truncated cone billets. The measured curvatures of the barreled truncated cone billets of all the three metals are found to closely conform to the calculated values on the assumptions that the shape of the barrels is in the form of a circular arc. It is further found that the measured radius of curvature of barrels exhibited a linear relationship with a geometrical shape factor irrespective of the aspect ratios of the truncated cone billets. Further, an empirical relationship has been established between the measured radius of curvature of the barrels and stress ratio parameter. A comparative study of barreling behaviour of aluminium, copper and zinc, during upset forging operation in unlubricated condition is presented in this paper

Prediction and optimization of mechanical properties of particles filled coir-polyester composites using ANN and RSM algorithms

81-86Mechanical properties of coir-polyester composites filled with aluminium oxide and calcium carbonate particles have been evaluated. As the mechanical properties of coir-polyester composites mainly depend upon the fibre length, fibre diameter and filler content, the present study deals with the prediction of mechanical properties using artificial neural network and determination of optimum fibre parameters using response surface methodology algorithms. The particles filled coir-polyester composites exhibit better values of tensile strength, flexural strength, impact strength and abrasion loss properties of 21.39 MPa, 79 MPa, 37.28 kJ/m2 and 570 mm3 for 42.41 mm fibre length, 0.25mm fibre diameter and 2.5% filler content respectively

<span style="font-size:15.0pt;mso-bidi-font-size: 16.0pt;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA; mso-bidi-font-weight:bold" lang="EN-US">Modelling and optimization of mechanical behaviors of Al₂O₃-coir-polyester composites using response surface methodology</span>

59-67The tensile, flexural, impact and abrasion loss behaviors of Al2O3 impregnated coir fiber-reinforced polyester composites are evaluated. The short untreated coir fibers are used as reinforcements in polyester matrix. The effects of fiber length, fiber diameter and filler content on the mechanical properties of alumina-coir-polyester composites are studied by developed regression models in this investigation. The optimum parameters for better mechanical properties are determined using response surface methodology approach. </span

Biosynthesis andCharacterization of Biodiesel from Cottonseed Oil Using Pseudomonas fluorescences Lipase and the Performance of its Blend (B20) in diesel Engine

Lipase-catalyzed alcoholysis of vegetable oils has attracted significant interests in the production of biodiesel. Present work deals with biosynthesis and characterization of biodiesel from cottonseed oil using Pseudomonas fluorescences lipase and the performance studies of the blend B20 (contains 20 % biodiesel and 80 % diesel). Response Surface Methodology based Box-Behnken design was used to optimize the transesterification reaction variable – Ethanol/oil molar ratio, catalyst loading and reaction time for production of ethyl esters. The optimized conditions for biodiesel production were found as follows: ethanol to oil molar ratio: 7 mol/mol, catalyst loading: 6 g, and reaction time 68 h. The optimum biodiesel yield was 93.5 %. Properties such as flash point, fire point, density, viscosity and calorific values of biodiesel B20 and diesel were compared. B20 fuel was tested in a single cylinder, four stroke, direct injection, constant speed, compression ignition diesel engine (Kirloskar) to evaluate the performance and emissions

Effect of Annealing Temperature in Al 1145 Alloy Sheets on Formability, Void Coalescence, and Texture Analysis

This paper deals with a combined forming and fracture limit diagram and void coalescence analysis for the aluminum alloy Al 1145 alloy sheets of 1.8 mm thickness, annealed at four different temperatures, namely 200, 250, 300, and 350 A degrees C. At different annealing temperatures these sheets were examined for their effects on microstructure, tensile properties, formability, void coalescence, and texture. Scanning electron microscope (SEM) images taken from the fractured surfaces were examined. The tensile properties and formability of sheet metals were correlated with fractography features and void analysis. The variation of formability parameters, normal anisotropy of sheet metals, and void coalescence parameters were compared with texture analysis

Experimental investigation of forming limit, void coalescence and crystallographic textures of aluminum alloy 8011 sheet annealed at various temperatures

In this work, a combined forming and fracture limit diagram, fractured void coalescence and texture analysis have been experimentally evaluated for the commercially available aluminum alloy Al 8011 sheet annealed at different temperatures viz. 200 degrees C, 250 degrees C, 300 degrees C and 350 degrees C. The sheets were examined at different annealing temperatures on microstructure, tensile properties, formability and void coalescence. The fractured surfaces of the formed samples were examined using scanning electron microscope (SEM) and these images were correlated with fracture behavior and formability of sheet metals. Formability of Al 8011 was studied and examined at various annealing temperatures using their bulk X-ray crystallographic textures and ODF plots. Forming limit diagrams, void coalescence parameters and crystallographic textures were correlated with normal anisotropy of the sheet metals annealed at different temperatures. (C) 2013 Politechnika Wroclawska. Published by Elsevier Urban & Partner Sp. z o.o. All rights reserved