 Subjects -> METALLURGY (Total: 58 journals)
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- Optimization of process variables in electric discharge machining (EDM)
using Taguchi methodology
Abstract: Title: Optimization of process variables in electric discharge machining (EDM) using Taguchi methodology
Authors : Kumar, Sudhir; Ghoshal, Sanjoy Kumar; Arora, Pawan Kumar: The present study engrossed with the functional relationship between the input and output parameters of the electric discharge machining (EDM). Four controllable machining parameters, viz. gap voltage (A), current (Ip), duty cycle (C) and pulse on time (Ton) have been chosen to ascertain the electrode wear rate (EWR) and surface roughness (SR) of AISI 420 material with copper electrode. Through Taguchi method, a design of experiment developed and it has been used to perform the experiment based on L16 orthogonal array (OA). During machining of AISI420, the highest influencing factor in EWR is IP and least is C. Similarly, for SR Ton is most and C is least significant factor. From analysis of variance (ANOVA), for EWR, IP is having most significant 79.43% contribution and C is having least significant 2.36 % contribution. Similarly, for SR, Ton is having most significant 39.95% contribution and A is having least significant 11.79 % contribution.Page(s): 819-825
PubDate: 2020-08-01T00:00:00Z
- An experimental and simulation validation of residual stress measurement
for manufacturing of friction stir processing tool
Abstract: Title: An experimental and simulation validation of residual stress measurement for manufacturing of friction stir processing tool
Authors : Butola, Ravi; Murtaza, Qasim; Singari, Ranganath Muttana: Residual stresses have been considered to be an important parameter when friction stir processing (FSP) tool is to be manufactured. FSP has often been used for surface modification and fabrication of surface composites. Involuntary residual stress in a designed tool may cause it to fail before due time. Because of this, the knowledge about the stresses on the tool probe after its machining has been considered to be desirable. The present research has focused on the analysis of the residual stresses on the tip and periphery of the FSP tool probe which has been manufactured using H13 tool steel material during the turning processes on a CNC lathe machine. The experiments have been performed on two different types of tool probes, namely circular, tapered circular probes. ABAQUS/CAE simulation has been performed for circular and tapered circular probe, as the provision of a sustainable, simple and reasonable model to analyze the machining processes (using ABAQUS/CAE software) has been the primary objective of this research. The results have been found to be within a close range of the experimental observations. The same model can thus be applied to other geometries.Page(s): 826-836
PubDate: 2020-08-01T00:00:00Z
- Computational investigation of solar updraft tower for power generation in
sultanate of Oman
Abstract: Title: Computational investigation of solar updraft tower for power generation in sultanate of Oman
Authors : Husain, Afzal; Zunaid, Mohammad; Brashdi, Mohammed AL; Maqbali, Fahad Al; Al-Jabri, Emad; Al-Mahrizi, Abdulmonem: The current study is aimed at harnessing solar power through solar updraft tower (SUT) and explored the local environmental factors conducive to SUT installation. The SUT collects solar insolation to raise the air velocity, which is then allowed to pass through a ducted turbine. An alternator is installed with the air turbine to generate electricity. The study presents a performance analysis of SUT based on local thermal radiation and wind velocity. Three-dimensional numerical modelling of SUT is carried using computational fluid dynamics (CFD) solver. The model is validated with the experimental results available in the open literature. The collector temperature profile obtained through CFD modelling matches well with the experimental results. A maximum temperature rise of 20 ºC was ob-served in the collector modelled and solved numerically using CFD solver. The air velocity increases as the flow move from the collector periphery to the center of the SUT and reach to its maximum just before the center of the SUT. However, for the chimney, the temperature was observed to be increased continuously due to its continuous heating through the chimney walls, which receives solar radiation. The performance of SUT is examined with the change in inlet air velocity based on the local conditions in the Sultanate of Oman.Page(s): 837-843
PubDate: 2020-08-01T00:00:00Z
- Mechanical and tribological properties of aluminium incorporated with
amorphous Ni60Nb40 particles
Abstract: Title: Mechanical and tribological properties of aluminium incorporated with amorphous Ni60Nb40 particles
Authors : Jayalakshmi, Subramanian; Singh, Ramachandra Arvind; Mohan, Sanjay; Chen, Xizhang; Gupta, Manoj: In this paper, development and characterization of pure aluminium (Al) reinforced with metallic amorphous Ni60Nb40 particles has been presented. Ni60Nb40 amorphous alloy reinforcement powder has been incorporated within Al-metal powder to produce Al-Ni60Nb40 composite. The composite has been sintered using bidirectional microwave sintering technique. Structure, indentation/tensile/compressive behaviour and tribological properties of the produced Al-10% Ni60Nb40 have been evaluated. It has been found that the: (i) reinforcement have retained the amorphous structure, (ii) reinforcement have distributed uniformly in the matrix and (iii) interface between the Al-matrix and the amorphous reinforcement has been free of reactive products. Upon comparison of mechanical properties with pure aluminium, the synthesized composite has showed significant enhancement in microhardness, tensile and compressive yield strengths. Under dry sliding wear condition, the composite has showed lower wear rates and lower coefficient of friction. The observed improvement in the composite behaviour has been explained using the processing-microstructure-mechanical properties correlation.Page(s): 844-852
PubDate: 2020-08-01T00:00:00Z
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Open Access journal
