Abstract This paper presents experimental and simulation study of the effects of stress on microstructure and failure morphology of low carbon steel under plane stress conditions. The study has revealed large extension of grains at the point of fracture and, stress and strain looped around the pearlitic faces of the microstructure matrix. The stress and strain distributions in the microstructure have shown that concentration of stress and strain on the pearlite were instrumental to oblique f...
ABSTRACT We report the development of a predictive model based on artificial neural network (ANN) for the estimation of flank and nose wear of uncoated carbide inserts during orthogonal turning of NST (Nigerian steel) 37.2. Turning experiments were conducted at different cutting conditions on a M300 Harrison lathe using Sandvic Coromant uncoated carbide inserts with ISO designations SNMA 120406 using full factorial design. Cutting speed (v), feed rate (f), depth of cut (d), spindle power (...
Abstract Computers have made the greatest impact in the advancement and development of almost all aspect of human endeavour, particularly in the engineering field. In this research, effort is geared towads improving the universal design and final manufacturing of commercial cams in many automotive and other related companies around the world. A software package for the design and profile simulation of plate cams with a possible choice of two followers (Roller and Flat-Face) using eight standa...
ABSTRACT Efforts to reduce energy consuniption in domestic buildings and commercial area have been intensified recently in view ofthe limiting ofrhe growing demand for electricity and the efforts to reduce CO2 . Investigations into energy reduction strategies have been extensive with acrive and rigorous researches carried out successfully in many countries of the world. 4 walk-rhrough energy audit was conducted in the School to determine the peak energy demand of the entire School as well as...
ABSTRACT -The paper presents a productivity model with an inflation component based on an 'established productivity measurement theory. The motivation for writing this paper is the need for conflict resolution at the implementation of productivity incentive programs. A common complaint from trade unions and organizations is that productivity is inaccurately assessed when the traditional inputoutput approach is utilized. The support for this argument is that a general rise in prices of materia...
Abstract Measurements have been made in a turbulent boundary layer which is subjected to a short roughness strip, with the view to examine the influence of short roughness strip on the large scale motion. This is quantified through the analysis of autocorrelation of the fluctuating velocities in the streamwise and wall-normal downstream of a roughness strip. Also, distributions of cross correlation functions are presented. The results indicate that, reference to the smooth wall, there are not...
Abstract In a previous publication in this journal the framework for the development of a model for the road bump problem was laid. The current paper focuses on the aspect of determining the effective distance between two consecutive road bumps developing equations governing the velocity and the wavelength of the motion of the vehicle. The wave equation is re-modelled connecting the isolation factor, linear velocity, wavelength and the frequency of motion of the vehicle over a road bump. A ne...
ABSTRACT Corrugated pipes are pipes with walls of rough surface consisting of dicrete grooves periodicaIly disposed along the flow direction and commonly use in engineering application such as irrigation, delivery devices to main distribution ducts as in transport of Liquid Natural Gas from ships to the mainland distribution network and heat exchanger in heating, ventilation, air-conditioning, etc. The simulation of turbulent, incompressible, isotherminal and single-phase flow is considered f...
ABSTRACT Exergctic analysis of atmospheric distillation plant of Warri Refinery and Petrochemical Company (WRPC) was conducted to evaluate exergy efficiencies and irreversibilities in each unit of the system with aim of identifying potential areas for improvement. The process simulation was carried out using commercial simulator HYSYS® 2003. The results of the simulation compared reasonably well 'with actual plant process parameters with a relative error of 7.22%, Thchighest irreversibility ...
ABSTRACT In this work, modifications have been done on a prototype pneumatic separator to improve its efficiency. The effects of the modifications were studied by carrying out performance test analyses on the two blowers and reciprocating sieve mechanism which make up the critical components of the separating machine. The variations in the feed weights of the sieve were analysed to determine the best and most effective screening process. Also, the best and least tilt angles of the blowers we...
Abstract- This study utilized fractal disk dimension characterization to investigate the system response of a nonlinear, harmonically driven pendulum of mass, m (or weight. W) and length I over a well-defined parameter plane of excitation amplitude versus damping factor. The system response was simulated at three drive ffequencies (symbol,*) of 1/3, 2/3 and 313. A Runge-Kutta fourth order algorithm, coded in FORTRAN programming language was used to simulate the System response over a 101 by ...
ABSTRACT This study investigated the corrosion resistance of Nickel and Gold plated carbon steels ornamentals in 0.5rno~dd Suphuric acid (&SO4) medium. Nickel plating of carbon steel ' was done in watts solution for 25 minutes with a current density of 3 Aldrn3 at 60°C. The nickel plated carbon steel was later gold plated for 20 minutes with a current density of 0.2 A,ldm3 at 50°C . The plated and unplated carbon steels were exposed to environment for 15 days. The weight loss was taken eve...
ABSTRACT Nigeria currently imports large quantities of Activated Carbon (AC), for its domestic usage, despite abundance of agricultural wastes (coconut shells, palm kernel shells, etc), that can be used as raw materials. Short-circuiting of heating elements and absence of inert gases inlet have been identified as major challenges associated with AC production in Nigeria. This work was designed to develop a batch reactor incorporating functional materials for production of AC using locally so...
ABSTRACT Low carbon steel metal is used for the manufacture of nails. Steel wire with
ABSTRACT This paper presents the design of a central air-conditioning/ducting system for a case study of a University Senate Chamber in Nigeria. The design aims at maintaining conditions that are conducive to human comfort within the senate chamber of the University (24OC-25.5OC, 50%-55% RH). The design month was March (6) and using the expert assistance found in the carrier system design ducting analysis manual the refrigeration tonnage obtained was 40 and the total air quantity required to ...