International Journal of Engineering Research in Africa最新文献_第8页

Experimental Study on the Behaviour of Short Columns Confined by Waste Plastic Bags-Epoxy Composites 废塑料袋-环氧树脂复合材料约束短柱性能的试验研究

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-11-23 DOI: 10.4028/p-kx14u4

Shaban Shahzad, R. Hameed, S. A. Gillani, M. R. Riaz, Umair Hameed, Khurram Gulzar

{"title":"Experimental Study on the Behaviour of Short Columns Confined by Waste Plastic Bags-Epoxy Composites","authors":"Shaban Shahzad, R. Hameed, S. A. Gillani, M. R. Riaz, Umair Hameed, Khurram Gulzar","doi":"10.4028/p-kx14u4","DOIUrl":"https://doi.org/10.4028/p-kx14u4","url":null,"abstract":"An experimental study was carried out to investigate the behaviour of short column confined by waste plastic bags and nylon strips and findings of this study are presented in this paper. Eight reinforced concrete (RC) short columns were casted. Among them two specimens were named as control, while remaining six specimens were divided into three groups [two specimens for each group] based on different confinement techniques investigated in this study. In retrofitting technique 1 (RT-1), RC short columns were externally confined by full wrap of plastic bags, while in retrofitting techniques 2 (RT-2) and 3 (RT-3), confinement was provided to the short columns by stirrups of nylon and plastic bags with 25 mm clear spacing, respectively. The testing under compression loading was performed on UTM of 100T capacity. From the results obtained, seismic parameters such as ductility, fracture energy before peak and after peak, factor k* and load-displacement response were studied. The results indicated that RC short column confined by RT-1 (full wrap) gives better performance in terms of ductility and fracture energy after peak. Increase in the ductility of RT-1 specimen was about 25% as compared to the control one. Moreover, post-peak fracture energy exhibited by short column confined through techniques RT-1 and RT-2 was 132 and 125 N/mm as compared to control one with 14 N/mm of fracture energy. The experimental observations further indicated that the failure of control specimen was sudden showing high brittleness while the failure of confined specimens by RT-1 and RT-2 techniques was observed to be gradual giving some warning before final failure.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45593208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effect of Tool Design on the Mechanical Properties of Bobbin Friction Stir Welded High-Density Polyethylene Sheets: Experimental Study 刀具设计对筒管搅拌摩擦焊接高密度聚乙烯片材力学性能影响的实验研究

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International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-8c4i2j

Djilali Bouha, Habib Khellafi, El Bahri Ould Chikh, H. Meddah, Abdellah Kaou

{"title":"Effect of Tool Design on the Mechanical Properties of Bobbin Friction Stir Welded High-Density Polyethylene Sheets: Experimental Study","authors":"Djilali Bouha, Habib Khellafi, El Bahri Ould Chikh, H. Meddah, Abdellah Kaou","doi":"10.4028/p-8c4i2j","DOIUrl":"https://doi.org/10.4028/p-8c4i2j","url":null,"abstract":"Welding polymers by the friction stir welding (FSW) technique is one assembly process among several known assembly techniques which consists in welding two materials without filler material. The FSW process is based on the generation of heat due to friction and material deformation under an axial force. Among the main aspects affecting material flow, the choice of welding tool geometry has become of great interest to improve the welds quality. The main objective of this work is the welding of polymers using the FSW technique. A new method of welding HDPE (high density polyethylene) plates, called BT-FSW (bobbin tool friction stir welding) was developed. Standard rectangular shape intended for the distribution of natural gas has been successfully welded by BT-FSW. Tensile tests and hardness measurements were carried out on samples cut from the welded sheets and the results were analyzed to compare the mechanical characteristics of the plates welded by the BT-FSW and conventional FSW (C-FSW) processes. The results of the comparative studies on the micro-hardness characteristics and mechanical properties of the two welding processes indicate that welding using the bobbin tool can significantly reduce hardness and improve both weld formation and mechanical properties of joints. This study showed that the design of the welding tool has a big impact on the weld strength. An improvement in the mechanical properties of the specimens welded by BT-FSW was observed to give a better welding quality for the polymers studied.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45211279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Smart Grid Challenges in Morocco and an Energy Demand Forecasting with Time Series 摩洛哥智能电网面临的挑战及时间序列能源需求预测

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-2gufv6

Meryem Meliani, A. El Barkany, I. El abbassi, M. Mahmoudi

{"title":"Smart Grid Challenges in Morocco and an Energy Demand Forecasting with Time Series","authors":"Meryem Meliani, A. El Barkany, I. El abbassi, M. Mahmoudi","doi":"10.4028/p-2gufv6","DOIUrl":"https://doi.org/10.4028/p-2gufv6","url":null,"abstract":"Facing development requirements and changes in the global energy context, Morocco has begun a process of diversification of the national energy mix in favor of renewable energy, while ensuring a competitive energy, in terms of costs, availability of products and their security and sustainability. Within this framework, Morocco launched in 2009 a national energy strategy whose major orientations focus on the security of energy supply and the generalization of its access, the preservation of the environment, through the use of renewable energy, energy efficiency, the strengthening of interconnection and regional cooperation. Through this article, the current state of the Moroccan network will be studied, as well as its potential in terms of renewable energy. Some strategies to overcome the challenges facing smart grid deployment in Morocco will also be presented. Then, the long-term energy demand, generation capacity, and renewable energy evolution in Morocco around 2030 will be estimated based on a time series using the artificial neural network method, which can be injected into the grid without causing any transit restrictions on the utility network or on the whole power system. As a result, the wind power available capacity was estimated to be 4087 MW, and the solar power available capacity was estimated to be 4713 MW by 2030. These results will be then compared to those estimated with the mathematical method. As well as, with the accuracy results of similar studies with different time series forecasting techniques. The accuracy value of this study is between 1.2% and 3.5%. So, the performance and viability of the proposed model can be studied.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44475818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Thermal Behavior of the early Life of an Aluminum Electrolysis Cell 铝电解槽早期寿命的热行为

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International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-v5kt07

Mohamed M. Ali, Khalid Yuossif, G. Abdalla, E. Elbadry

引用次数: 0

Spark Plasma Sintering of TaN/TiAl Composites: Microstructure and Microhardness Study 放电等离子烧结TaN/TiAl复合材料的显微组织和显微硬度研究

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-87lh6f

Vinolia Phumzile Mkhwanazi, B. J. Babalola, O. Ayodele, T. Tshephe, P. Olubambi

{"title":"Spark Plasma Sintering of TaN/TiAl Composites: Microstructure and Microhardness Study","authors":"Vinolia Phumzile Mkhwanazi, B. J. Babalola, O. Ayodele, T. Tshephe, P. Olubambi","doi":"10.4028/p-87lh6f","DOIUrl":"https://doi.org/10.4028/p-87lh6f","url":null,"abstract":"Titanium aluminide (TiAl)-based materials have attracted much attention in the aerospace and automobile industries due to their attractive properties. Studying the microhardness of these materials as it relates to the as-sintered and heat-treated state is of interest in this article. TiAl and TiAl-based composites with varying additions of Tantalum nitride (TaN) content (2, 4, 6, 8 wt.%) were prepared by spark plasma sintering technique. The samples were sintered at 1150 °C, 100 C/min, 50 MPa, a dwell time of 10 mins, and fully dense characteristics as their relative densities were above 98 %. The microstructure and microhardness of the sintered samples were examined. Also, the sintered samples' microhardness was evaluated after the heat treatment process at 750 °C. It was observed that the relative density of the composites dropped at 2 and 8 wt.% addition of TaN, while the addition of TaN significantly increased hardness value in the as-sintered and heat-treated condition, from 304 HV to a maximum of 499 HV in the as-sintered state. The microstructures revealed that the reinforcement was segregated to the gamma phase, interlocked by the lamellar colonies.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42148231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Atomistic Investigation Using Molecular Dynamics Simulation of τ4-Al3FeSi2 and τ12-Al3Fe2Si Phases under Tensile Deformation 拉伸变形下τ4-Al3FeSi2和τ12-Al3Fe2Si相分子动力学模拟的原子性研究

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-0xoa4x

Meryem Taoufiki, H. Chabba, D. Dafir, A. Barroug, M. Boulghallat, A. Jouaiti

{"title":"Atomistic Investigation Using Molecular Dynamics Simulation of τ4-Al3FeSi2 and τ12-Al3Fe2Si Phases under Tensile Deformation","authors":"Meryem Taoufiki, H. Chabba, D. Dafir, A. Barroug, M. Boulghallat, A. Jouaiti","doi":"10.4028/p-0xoa4x","DOIUrl":"https://doi.org/10.4028/p-0xoa4x","url":null,"abstract":"Aluminum-Iron-Silicon (Al-Fe-Si) alloys are extremely applied in many specific industries, such as aerospace and automobiles. Their atomic concentration influences the mechanical behavior of the investigated τ4-Al3Fe2Si and τ12-Al3FeSi2 phases. The uniaxial-tensile deformation is used to compare their structural evolution under the same conditions.Atomic displacement and mechanical behavior have an interest in the elastic and plastic areas. Stress-Strain responses and Radial Distribution Function (RDF) are required. Further, atomic simulations using molecular dynamics demonstrate the change occurs. Its process is carried out at a strain rate of 21×1010 s-1 using the NPT (isothermal-isobaric) with roughly 20 700 atoms at a pressure of 105 Pa. Furthermore, using a Nosée Hoover thermostat at the temperature of 300 k is decisive.The Modified Embedded Atoms Method (MEAM) is the applied potential between Al, Fe, and Si atoms. The elastic modulus and single pair atomic correlation before and after straining are increased by this method. The atomic correlations are shown in short- and long-range order and the τ12-Al3Fe2Si phase illustrates stronger properties compared to τ4-Al3Fe2Si phase. Our results underscore an important variation associated with the change of iron and silicon concentration. More specifics are covered in the selection paper.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45985035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Thermal Analysis of the Mechanism and Kinetics Parameters of the Metastable Phases Precipitation in the Al-Mg-Si Alloy Al-Mg-Si合金亚稳相析出机理及动力学参数的热分析

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International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-dr7fp5

Mounia Guessoum, A. Raho, N. Ouali, M. Trari

引用次数: 0

Coconut Shell Particle Reinforced Al-Cu-Mg Nanocomposites for Cavity Die Mould Parts Applications 椰壳颗粒增强铝铜镁纳米复合材料在型腔模具零件中的应用

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-29l8h7

S. Bello

{"title":"Coconut Shell Particle Reinforced Al-Cu-Mg Nanocomposites for Cavity Die Mould Parts Applications","authors":"S. Bello","doi":"10.4028/p-29l8h7","DOIUrl":"https://doi.org/10.4028/p-29l8h7","url":null,"abstract":"This study explored coconut shells in developing Al-Cu-Mg based nanocomposites for fabricating mould parts. The aim is to engineer alternate way through which income can be generated from agricultural wastes and recycling of industrial waste like aluminium cans. Al-Cu-Mg based nanocomposites were produced and characterised. Effects of carbonised and uncarbonised coconut shell nanoparticle (UCSNP) additions on properties of Al-Cu-Mg nanocomposites were compared. Maximum tensile strength was obtained at 10%vol uncarbonised coconut shell nanoparticle additions to Al-Cu-Mg. Increase in tensile strength and elastic modulus were noted with carbonised coconut shell reinforced Al-Cu-Mg nanocomposites against the decrease in the elastic (Young’s) modulus of the UCSNP/Al-Cu-Mg nanocomposites. Despite highest tensile strength of 10%volUCSNP/Al-Cu-Mg, 10%volCCSNP/Al-Cu-Mg nanocomposite is ranked as the best material in this study due to its optimum combination of properties including tensile strength, elastic modulus, tensile strain, impact energy and hardness values. Hence, it has been selected for fabricating open die mould parts to be used in compression sheet forming process for fabricating polymeric standard samples for tensile flexural analyses. Keywords: Al-Cu-Mg, Coconut, Shell, Nanoparticles, Mould fabrication","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48618679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Viscoelastic Measurements of Clay Suspensions and their Relationship to Strength of Unfired Clay Bricks with Almond Husk Additive 粘土悬浮液的粘弹性测试及其与杏仁壳添加剂未烧制粘土砖强度的关系

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International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-1p1oy2

Othmane Noureddine, I. Manssouri, K. Cherkaoui, H. Sahbi, Houssame Limami, S. Erba, A. Khaldoun

{"title":"Viscoelastic Measurements of Clay Suspensions and their Relationship to Strength of Unfired Clay Bricks with Almond Husk Additive","authors":"Othmane Noureddine, I. Manssouri, K. Cherkaoui, H. Sahbi, Houssame Limami, S. Erba, A. Khaldoun","doi":"10.4028/p-1p1oy2","DOIUrl":"https://doi.org/10.4028/p-1p1oy2","url":null,"abstract":"Engineered unfired clay bricks are an ecological alternative to overcome conventional construction materials’ inconvenience. This work investigates the rheological behavior of organo-silica suspensions, made from almond husk waste and illite clay, in relation to the compressive strength of unfired clay bricks incorporating the same waste. Selected proportions by weight of almond husk are 2, 5, 10, and 20 wt.%. Results from the compressive strength test show an improvement, of 8.98% in bricks with 2 wt.% waste content compared to the control sample, thanks to an increase in friction and the fiber bridging mechanism. Then, a progressively decrease in strength is recorded with the addition of waste. The decrease in strength is reported to be the creation of pores in the matrix, and loss of cohesion. It is found that the storage modulus, on a logarithmic scale, follows inversely the same trend of the compressive strength in previously prepared bricks. The results from the strength test and rheological test are linearly correlated. Strong coefficients of determination are found; R2=0.9809 (with 40 wt.% water content) and R2=0.9206 (with 50 wt.% water content). The findings from this study demonstrate the possibility of assessment and prediction of unfired bricks’ strength using rheometry.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47066530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Evaluation of Un-Preprocessed Expired Piroxicam Drug as Corrosion Inhibitor for Mild Steel in Hydrochloric Acid 未预处理过期吡罗昔康在盐酸中作为低碳钢缓蚀剂的评价

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International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-dsiz01

Omokafe Michael, Olatunde Borode, Oyelola Oladunni Alabi, K. Alaneme, A. Adesoji

{"title":"Evaluation of Un-Preprocessed Expired Piroxicam Drug as Corrosion Inhibitor for Mild Steel in Hydrochloric Acid","authors":"Omokafe Michael, Olatunde Borode, Oyelola Oladunni Alabi, K. Alaneme, A. Adesoji","doi":"10.4028/p-dsiz01","DOIUrl":"https://doi.org/10.4028/p-dsiz01","url":null,"abstract":"Illegal disposal and recirculation of expired drugs is a global menace which can be solved by their re-utilization as corrosion inhibitors. Thus, helping to combat the current widespread corrosion-induced wastage of expensive mild steel infrastructure. The experimental investigation evaluated the capability and effectiveness of an expired drug (piroxicam) for inhibiting mild steel corrosion in blank 0.5M HCl and acidic environments containing 2 to 8 g/L of the expired drug. Spectrometry, weight loss analysis, atomic absorption spectroscopy, microscopy, polarisation and electrochemical impedance study (EIS) were employed. Analyses revealed drastic inhibition of corrosion in mild steel by expired piroxicam drug in the acid. Corrosion currents ( ) obtained at all concentrations of the expired drug were reduced in comparison to that of the uninhibited environment. The solution resistance recorded was not significantly altered; charge transfer resistances were increased while the capacitance of the electrochemical double layers (Double layer capacitance) as well as the concentration of dissolved iron (Fen+) ions in the environment, were all reduced with increasing concentration of the expired drug. Although moderate amounts of the expired drug delivered appreciable levels of corrosion inhibition when dissolved directly into the corrosive environment and without any pre-treatment, increased concentration of expired drug resulted in increased corrosion inhibition efficiency. The highest corrosion inhibition efficiency obtained was 97.6% and was from the acidic environment that contained 8 g/L of expired piroxicam drug. The expired piroxicam drug inhibited corrosion of mild steel in 0.5M HCl acid via spontaneous physical adsorption (physisorption) process(s), obeying Langmuir’s adsorption isotherm.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47062599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2