Thesis Chapters by chukwuemeka S Ibeh
The use of edible oils as core oil in the foundry industries has remained the conventional oil wi... more The use of edible oils as core oil in the foundry industries has remained the conventional oil widely used in the past decade. The search for alternative core oils has become challenging due to high demand of these edible oils for consumption and industrial applications. Some non-consumable oils such as neem, jatropha, castor and sheabutter oils were evaluated as core binders in foundry sand. These plants are found littered/wasted around in major parts of Nigeria and its potentials are yet to be ultilised maximally by countrymen. Core specimen containing silica sand bonded with starch, water in variable proportions of non-edible oil were tested for moisture content, permeability, tensile strength, green/baked compressive strength, baked collapsibility and fatty acid to determine if its felicitous for foundry core application. An optimum baked strength of 1648kN/m 2 was obtainable in a mixture of 6% neem seed oil, 2% water, 2% starch and balance sand. This can be attributed to its high degree of unsaturated properties contained.
The research was conducted to ascertain level of awareness and attitude of parents, students and ... more The research was conducted to ascertain level of awareness and attitude of parents, students and the public towards technical and vocational system of education. A sample of 400 students from various secondary schools, 400 parents in the community and 400 private/public employees completed a questionnaire that was designed to validate the study. Percentage scores were used to answer the research questions. Results show that students, parents have negative attitude towards acquiring skills/knowledge from technical schools such as Mono-Polytechnics and National Certificate Education (NCE). Only 0.4, 7.1% of the students preferred acquiring awards from mono-polytechnics; 2.5, 9% parents preferred their wards to acquire knowledge from technical colleges and polytechnics while over 25% of students and parents preferred the university education. On the basis of these findings, it was recommended among others, that Government should provide workable and consistent self-value link chain between each technical and university institutions to collectively promote indigenous innovation.
The use of edible oils as core oil in the foundry industries has remained the conventional oil wi... more The use of edible oils as core oil in the foundry industries has remained the conventional oil widely used in the past decade. The search for alternative core oils has become challenging due to high demand of these edible oils for consumption and industrial applications. Some non-consumable oils such as neem, jatropha, castor and sheabutter oils were evaluated as core binders in foundry sand. These plants are found littered/wasted around in major parts of Nigeria and its potentials are yet to be ultilised maximally by countrymen. Core specimen containing silica sand bonded with starch, water in variable proportions of non-edible oil were tested for moisture content, permeability, tensile strength, green/baked compressive strength, baked collapsibility and fatty acid to determine if its felicitous for foundry core application. An optimum baked strength of 1648kN/m 2 was obtainable in a mixture of 6% neem seed oil, 2% water, 2% starch and balance sand. This can be attributed to its high degree of unsaturated properties contained.
ABSTRACT
Quenching is necessary to increase the mechanical properties of steel; however, it is of... more ABSTRACT
Quenching is necessary to increase the mechanical properties of steel; however, it is often accompanied by thermal stresses which may lead to distortion and possibly cracking. Therefore it is desirable to select quenching media that maximize the desired properties while at the same time minimize distortions. One of the major concern regarding water, brine and petroleum based oil commonly used is their tendency to distortion. Petroleum based oils are non-renewable and contribute to air and water pollution. In view of the current awareness and demand for more environmentally friendly quenchants, there is a renewed interest in vegetable oils as alternative to petroleum-based oils. Previous studies have analysed and found some vegetable oils as suitable potential alternative to petroleum based oils for quenching. The current study is built on these past works on evaluating the effect of steel quenching on distortion with the use of vegetable oils as quenching medium. Modified C-ring samples were austenitised at 850 oC and quenched in four different vegetable oils. These results were compared to samples quenched in SAE 40 oil and water. Distortion were determined by measuring the percentage gap opening (i.e. distortion) of the modified C-ring test sample. The gap openings of modified C-ring test sample were measured before and after quenching. Average distortions at the three not ches were calculated. From the value obtained, samples quenched in melon oil shows highest value of distortion of 19 % while steels quenched in false walnut oil and palm oil have the least percentage distortion value of 14 % each. This implies that melon oil has the least desirable characteristic property for quenching medium carbon steel among the other oil. Carbon steel quenched in melon oil has the highest hardness value of 49.23 HC while carbon steel quenched in false walnut oil shows lowest hardness value of 46.01 HC. The microstructure obtained show martensite for all samples quenched in the vegetable oils in this study.
Papers by chukwuemeka S Ibeh
The use of edible oils as core oil in the foundry industries has remained the conventional oil wi... more The use of edible oils as core oil in the foundry industries has remained the conventional oil widely used in the past decade. The search for alternative core oils has become challenging due to high demand of these edible oils for consumption and industrial applications. Some non-consumable oils such as neem, jatropha, castor and sheabutter oils were evaluated as core binders in foundry sand. These plants are found littered/wasted around in major parts of Nigeria and its potentials are yet to be ultilised maximally by countrymen. Core specimen containing silica sand bonded with starch, water in variable proportions of nonedible oil were tested for moisture content, permeability, tensile strength, green/baked compressive strength, baked collapsibility and fatty acid to determine if its felicitous for foundry core application. An optimum baked strength of 1648kN/m 2 was obtainable in a mixture of 6% neem seed oil, 2% water, 2% starch and balance sand. This can be attributed to its hig...
A qualitative and comparative study was carried out on some locally sourced oils (melon oil, Afri... more A qualitative and comparative study was carried out on some locally sourced oils (melon oil, Africa elemi oil and Africa locust bean oil) to evaluate suitability as substitute quenching media to mineral-based oil. The cooling ability of the oils was investigated using AISI 1034 medium carbon steel. The effect of heat transfer coefficient on quench severity, mechanical properties of the quenched specimens were investigated in the course of the study. Results showed that the peak rate of heat extraction of melon oil, Africa locust bean and Africa elemi oil were higher than that of mineral oil. Higher heat transfer coefficient of 1463, 1023 W/m 2 k were obtained for melon oil and Africa locust bean; Africa elemi and SAE 40 oil have heat transfer coefficient of 982 and 469 W/m 2 k respectively. The selected oils can be used as quenchants for medium carbon steel, since the oils exhibits better cooling properties and mechanical properties than mineral-based oil.
IOSR Journal of Engineering (IOSRJEN), 2020
Friction material for automobile breaking system was developed using canarium schweinfurthii shel... more Friction material for automobile breaking system was developed using canarium schweinfurthii shell (CSS) otherwise known as African elemi. Tribological properties that direct or indirectly affect brake pad system such as thermal conductivity, water/oil absorption test, coefficient of friction, wear rate, hardness test, porosity, compressive, tensile strength, temperature, noise level generated and stopping time varying speed from 5.56-27.78 m/s was investigated. Experimentally developed produced brake pads using CSS were found to compete favourably with conventional brake pads and those from literature studies. The research finding using CSS indicates that CSS particle can effectively and efficiently replace asbestos in brake pad manufacturing.
This paper presents the design and implementation of a remote controlled vertically adjustable mo... more This paper presents the design and implementation of a remote controlled vertically adjustable motorized white board for the purpose of teaching. The objective is to have a white marker board that can be adjusted to various height so as to aid maximum use of the board by different teachers of varying heights and to have maximum exposure of what is written on the board to a class with same level seat arrangement. Pro-engineering was used for the CAD drawing of the board and Proteus was used to simulate the circuit designed. Furthermore, this design employs the use of a solid white board, motorized jack, rollers and remote control to aid the vertical adjustment of the height of the Whiteboard. The wood used were seasoned and then cut into the various sizes, component by component. These components were assembled and integrated with the electric jack. Using Kiel vision (software for programming) the code for the remote and the receiver were written and tested. The circuit was then assembled on vero board, using Topwin programmer, the circuit was programmed. After the fabrication, unlike the mechanical solid white board which involves much human effort to push the board through a grooved frame and manually locking it with a bolt by the side for the comfort of the teacher, the Remote control Whiteboard has overcome the manual method of adjustment and aid maximum view in a classroom with same level seat arrangement.
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Thesis Chapters by chukwuemeka S Ibeh
Quenching is necessary to increase the mechanical properties of steel; however, it is often accompanied by thermal stresses which may lead to distortion and possibly cracking. Therefore it is desirable to select quenching media that maximize the desired properties while at the same time minimize distortions. One of the major concern regarding water, brine and petroleum based oil commonly used is their tendency to distortion. Petroleum based oils are non-renewable and contribute to air and water pollution. In view of the current awareness and demand for more environmentally friendly quenchants, there is a renewed interest in vegetable oils as alternative to petroleum-based oils. Previous studies have analysed and found some vegetable oils as suitable potential alternative to petroleum based oils for quenching. The current study is built on these past works on evaluating the effect of steel quenching on distortion with the use of vegetable oils as quenching medium. Modified C-ring samples were austenitised at 850 oC and quenched in four different vegetable oils. These results were compared to samples quenched in SAE 40 oil and water. Distortion were determined by measuring the percentage gap opening (i.e. distortion) of the modified C-ring test sample. The gap openings of modified C-ring test sample were measured before and after quenching. Average distortions at the three not ches were calculated. From the value obtained, samples quenched in melon oil shows highest value of distortion of 19 % while steels quenched in false walnut oil and palm oil have the least percentage distortion value of 14 % each. This implies that melon oil has the least desirable characteristic property for quenching medium carbon steel among the other oil. Carbon steel quenched in melon oil has the highest hardness value of 49.23 HC while carbon steel quenched in false walnut oil shows lowest hardness value of 46.01 HC. The microstructure obtained show martensite for all samples quenched in the vegetable oils in this study.
Papers by chukwuemeka S Ibeh
Quenching is necessary to increase the mechanical properties of steel; however, it is often accompanied by thermal stresses which may lead to distortion and possibly cracking. Therefore it is desirable to select quenching media that maximize the desired properties while at the same time minimize distortions. One of the major concern regarding water, brine and petroleum based oil commonly used is their tendency to distortion. Petroleum based oils are non-renewable and contribute to air and water pollution. In view of the current awareness and demand for more environmentally friendly quenchants, there is a renewed interest in vegetable oils as alternative to petroleum-based oils. Previous studies have analysed and found some vegetable oils as suitable potential alternative to petroleum based oils for quenching. The current study is built on these past works on evaluating the effect of steel quenching on distortion with the use of vegetable oils as quenching medium. Modified C-ring samples were austenitised at 850 oC and quenched in four different vegetable oils. These results were compared to samples quenched in SAE 40 oil and water. Distortion were determined by measuring the percentage gap opening (i.e. distortion) of the modified C-ring test sample. The gap openings of modified C-ring test sample were measured before and after quenching. Average distortions at the three not ches were calculated. From the value obtained, samples quenched in melon oil shows highest value of distortion of 19 % while steels quenched in false walnut oil and palm oil have the least percentage distortion value of 14 % each. This implies that melon oil has the least desirable characteristic property for quenching medium carbon steel among the other oil. Carbon steel quenched in melon oil has the highest hardness value of 49.23 HC while carbon steel quenched in false walnut oil shows lowest hardness value of 46.01 HC. The microstructure obtained show martensite for all samples quenched in the vegetable oils in this study.