Rasheedat Mahamood
@unilorin.edu.ng
Associate Professor, Department of Materials and Metallurgical Engineering
University of Ilorin
RESEARCH, TEACHING, or OTHER INTERESTS
Engineering, Engineering, Multidisciplinary, Aerospace Engineering
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Segun E. Ibitoye, Chanchal Loha, Rasheedat M. Mahamood, Tien-Chien Jen, Meraj Alam, Ishita Sarkar, Partha Das, and Esther T. Akinlabi
Springer Science and Business Media LLC
AbstractIntegrating innovation and environmental responsibility has become important in pursuing sustainable industrial practices in the contemporary world. These twin imperatives have stimulated research into developing methods that optimize industrial processes, enhancing efficiency and effectiveness while mitigating undesirable ecological impacts. This objective is exemplified by the emergence of biochar derived from the thermo-chemical transformation of biomass. This review examines biochar production methods and their potential applications across various aspects of the iron and steel industries (ISI). The technical, economic, and sustainable implications of integrating biochar into the ISI were explored. Slow pyrolysis and hydrothermal carbonization are the most efficient methods for higher biochar yield (25–90%). Biochar has several advantages- higher heating value (30–32 MJ/kg), more porosity (58.22%), and significantly larger surface area (113 m2/g) compared to coal and coke. However, the presence of biochar often reduces fluidity in a coal-biochar mixture. The findings highlighted that biochar production and implementation in ISI often come with higher costs, primarily due to the higher expense of substitute fuels compared to traditional fossil fuels. The economic viability and societal desirability of biochar are highly uncertain and vary significantly based on factors such as location, feedstock type, production scale, and biochar pricing, among others. Furthermore, biomass and biochar supply chain is another important factor which determines its large scale implementation. Despite these challenges, there are opportunities to reduce emissions from BF-BOF operations by utilizing biochar technologies. Overall, the present study explored integrating diverse biochar production methods into the ISI aiming to contribute to the ongoing research on sustainable manufacturing practices, underscoring their significance in shaping a more environmentally conscious future.
Segun E. Ibitoye, Rasheedat M. Mahamood, Tien-Chien Jen, Chanchal Loha, and Esther T. Akinlabi
Springer Science and Business Media LLC
AbstractIn developing nations, research output is limited due to factors like unreliable power supply and inadequate laboratory equipment. The high cost of purchasing completed laboratory equipment and the unavailability of accessories for imported equipment further contribute to this issue. A biomass densification machine was designed and constructed to address these challenges for teaching and research purposes. The machine was tested at five different compaction pressures (100, 200, 300, 400, and 500 kPa) using gelatinized cassava starch as a binder. The physical and mechanical characteristics of the produced fuel briquettes were investigated following ASTM standards and procedures reported in the literature. The results show that the physical and mechanical properties of the fuel briquettes increase with compaction pressure. The compressive strength, durability, and water resistance of the briquettes varied between 55 and 101 kN·m−2, 89–99%, and 20–120 min, respectively, while the compressed and relaxed densities range from 0.780 to 1.220 g·cm−3 and 0.670 to 0.990 g·cm−3, respectively. The machine performed satisfactorily because the briquettes’ characteristics were found to meet the specified ISO Standard (17225). The development of this machine will enable academic institutions, researchers, and students to harness the potential of biomass through the densification process without the challenges posed by imported equipment. The creation of the machine will also facilitate students’ hands-on learning. By providing an easily accessible and reliable platform, academic and research institutions can integrate biomass solid fuel production experiments into their curricula, fostering a thorough understanding of renewable energy solutions and supporting sustainable practices. Therefore, it can be recommended for teaching and research in developing nations. Incorporating an electronic component, such as a digital pressure gauge and electric hydraulic jack, is recommended for future research to enhance the performance.
Noah E. El-Zathry, Stephen Akinlabi, Wai Lok Woo, Vivek Patel, and Rasheedat M. Mahamood
Springer Science and Business Media LLC
AbstractFriction stir-based techniques (FSTs), originating from friction stir welding (FSW), represent a solid-state processing method catering to the demands of various industrial sectors for lightweight components with exceptional properties. These techniques have gained much more attraction by providing an opportunity to tailor the microstructure and enhance the performance and quality of produced welds and surfaces. While significant attention has historically been directed towards the FSW process, this review delves into the working principles of FSTs, exploring their influence on mechanical properties and microstructural characteristics of various materials. Additionally, emphasis is placed on elucidating the advancement of hybrid FSW processes for both similar and dissimilar metal components, aimed at enhancing welding quality through meticulous control of grain textures, structures, precipitation, and phase transformations. Finally, the review identifies current knowledge gaps and suggests future research directions. This review paper synthesises academic literature sourced from the Web of Science (WoS) and Scopus databases, supplemented by additional sources such as books from the last 15 years.
Hassan Kobe Ibrahim, Mathew Sunday Abolarin, Asipita Salawu Abdulrahman, Peter Olorunleke Omoniyi, Rasheedat Modupe Mahamood, Tien-Chien Jen, and Esther Titilayo Akinlabi
Springer Science and Business Media LLC
AbstractThe structural integrity of new biocomposite implants is critical in ensuring the success of biomedical implants under physiological loading conditions. Studying the stress distribution, deformation, and potential failure modes under different loading scenarios is complex, expensive, and time-consuming, as it involves repeated surgery on clinical assessment. The present study aims to investigate the biomechanical stability of hip implants made of a Ti–Ha–CaCO3 biocomposite using finite element analysis. The Ti–Ha–CaCO3 biocomposite was modeled and simulated using Solidworks. The model mesh was generated to represent the implant’s geometry accurately, and normal human activities (standing and jumping) were considered the boundary conditions with the lower part of the femur fixed. The model was subjected to static loading following ISO 7206-4 with an equivalent load of 2300 N according to ASTM F2996-13 standard. The Ti–Ha–CaCO3 biocomposite demonstrated outstanding biomechanical stability under loading circumstances. The maximum von Mises stress (354.7 MPa) observed with the GSB-femur model in the implant was below the yield strength of the titanium implant, indicating that the implant can withstand applied loads without experiencing permanent deformation. However, 74.11 MPa was obtained as acceptable von Mises stress using GSB intramedullary rods for bone fixation. The most stable implant is DSB, with the lowest displacement value of 2.68 mm. Low equivalent strains were achieved for all the implants, as the highest strain (0.012) was obtained in the simulation of the stem DSB-femur model. Low-stress signals (SS) were obtained for the implant-femur models, indicating they are suitable for replacing bone for that loading. The DSB (7.19) is the most suitable among the studied stem-femur models, and GSB (0.87) remains the suitable intramedullary rod-femur model with the lowest SS.
Segun E. Ibitoye, Rasheedat M. Mahamood, Tien-Chien Jen, Chanchal Loha, and Esther T. Akinlabi
Elsevier BV
Ismaila Idowu Ahmed, Adeolu Adesoji Adediran, Raheem Abolore Yahya, Taiwo Yahaya, Segun Isaac Talabi, Jeleel Adekunle Adebisi, Rasheedat Modupe Mahamood, Jamiu Kolawole Odusote, Mariam Kehinde Sulaiman, Lawrence Aderemi Olatunji,et al.
Elsevier BV
Yasuhiro Okamoto, Togo Shinonaga, Yoshito Takemoto, Akira Okada, Akihiro Ochi, Ryuya Kishimoto, Sisa Pityana, Nana Arthur, Peter Omoniyi, Rasheedat Mahamood,et al.
Springer Science and Business Media LLC
AbstractTitanium alloy Ti6Al4V has been widely applied to medical, automotive, and aerospace industries due to its excellent properties such as high strength and excellent corrosion resistance. On the other hand, additive manufacturing (AM) technology can give the freedom of design of the products. In order to spread the AMed products, the joining of AMed and wrought products are required, and it is important to understand the joint characteristics. In this study, butt welding of Ti6Al4V plate was conducted by fiber laser in argon shielding, and the joint characteristics of laser weld wrought/wrought, AMed/AMed, and AMed/wrought Ti6Al4V plates were experimentally investigated. The AMed plate has higher tensile strength than wrought plate but the elongation of AMed plate is smaller, since AMed plate has α’ martensite due to rapid cooling during laser irradiation in AM process. Then, the laser weld joint of AMed/AMed plates has higher tensile strength, but smaller elongation than that of wrought/wrought plates. The weld joint of AMed/wrought plates shows good welding state, since small heat input leads to formation of small weld bead with higher hardness between wrought and AMed plates.
Esther T. Akinlabi, Peter Omoniyi, Tien-Chien Jen, Rasheedat M. Mahamood, Frederick Mwema, Stephen A. Akinlabi, and Cynthia S. Abima
American Society of Mechanical Engineers
Abstract The Ti6Al4V alloys are finding various industrial applications due to their attractive attributes, which can be enhanced via heat-treatment processes. In this study, titanium sheets (Ti6Al4V) were manufactured through laser metal deposition (LMD) using Ti6Al4V powder of particle sizes between 45–90 μm. The build parameters used are optimized at a laser power of 400 W, powder feed rate of 2.4 g/min, hatch spacing of 0.9652 mm, and scanning rotated at 90° between successive layers. The built block is sliced using a wire-electric discharge machine (EDM) into sheets of 2 mm thickness. The resulting blocks were joined using the butt configuration through laser beam welding technology. Post-weld heat treatments were conducted on the welds above the β transus temperature of 995°C. Material characterizations of the evolving properties were conducted using Optical Microscopy, Vickers microhardness, and tensile testing. The investigations show that the heat-treated samples have enhanced properties and can be recommended. The outcome of this research is significant as it gives insight into the optimization of laser welding and post-weld heat treatment parameters of Titanium Alloy Grade 5 for industrial applications.
Jamiu Adetayo Adeniran, Jeleel Adekunle Adebisi, Segun Isaac Talabi, Taiwo Yahaya, Ismaila Idowu Ahmed, Rasheedat Modupe Mahamood, Mariam Kehinde Sulaiman, Lawrence Aderemi Olatunji, Jamiu Kolawole Odusote, and Suleiman Abdulkareem
Informa UK Limited
P. O. Omoniyi, R. M. Mahamood, N. Arthur, S. Pityana, S. Skhosane, T. C. Jen, and E. T. Akinlabi
Springer Nature Singapore
Segun E. Ibitoye, Rasheedat M. Mahamood, Tien-Chien Jen, and Esther T. Akinlabi
Springer Nature Singapore
Segun E. Ibitoye, Rasheedat M. Mahamood, Tien-Chien Jen, and Esther T. Akinlabi
Springer Nature Singapore
P. O. Omoniyi, R. M. Mahamood, N. Arthur, S. Pityana, S. Skhosane, Y. Okamoto, T. Shinonaga, M. R. Maina, T. C. Jen, and E. T. Akinlabi
Springer Science and Business Media LLC
AbstractThe feasibility of joining laser metal deposited Ti6Al4V sheets using laser beam welding was investigated in this article. The additive manufactured sheets were joined using a 3 kW CW YLS-2000-TR ytterbium laser system. The mechanical properties and microstructure of the welded additive manufactured parts (AM welds) were compared with those of the wrought sheets welded using the same laser process. The welds were characterized and compared in terms of bead geometry, microhardness, tensile strength, fractography, and microstructure. The differences in characteristics are majorly found in the width of the bead and tensile strength. The bead width of AM welds appear wider than the wrought welds, and the wrought welds exhibited higher tensile strength and ductility than the AM welds.
Segun Emmanuel Ibitoye, Rasheedat Modupe Mahamood, Tien-Chien Jen, and Esther Titilayo Akinlabi
Institute of Research and Community Services Diponegoro University (LPPM UNDIP)
The United States Environmental Protection Agency (EPA) has reported that consumption of fossil fuels and their products has contributed about 65% of the global greenhouse gas emission. Therefore, it is expedient to look for alternative energy sources for an eco-friendly environment. The EPA recommended using biomass energy as a promising stabilization option to alleviate global climate change. This study focused on developing composites fuel briquettes from a blend of carbonized corncob and banana stalk. Carbonization was carried out at 380 oC, while 60 min was adopted as the residence time. Briquettes were manufactured at different blending ratios (90CC:10BS, 80CC:20BS, 70CC:30BS, 60CC:40BS and 50CC:50BS of corncob: banana stalk, respectively) and compaction pressures (50, 70 and 90 kPa) using gelatinized starch as binder. The manufactured briquettes' calculated and actual calorific values varied between 18.98-22.07 MJ/kg and 20.22-23.12 MJ/kg, respectively, while shatter indices were in the range of 38.22-89.34%. The compressed and relaxed densities of the fuel briquettes were in the range of 0.32-1.39 g/cm3 and 0.22-1.02 g/cm3, respectively. The relaxation ratio and water resistance properties varied between 1.11- 2.21 and 11-23 min, respectively. Analyses of the results revealed that compaction pressure, blending ratio, and particle size substantially affect the combustion and physico-mechanical characteristics of the manufactured fuel briquettes. When optimum combustion and physico-mechanical properties are required, a sample made from 90CC:10BS (S1) is recommended for use. The fuel briquettes manufactured in this study possess the required thermal and physico-mechanical properties of solid fuel; therefore, it is recommended for different applications.
Chukwubuikem C. Ngwoke, Rasheedat M. Mahamood, Victor S. Aigbodion, Tien-Chen Jen, Paul A. Adedeji, and Esther T. Akinlabi
Springer Science and Business Media LLC
Rasheedat M. Mahamood, T-C. Jen, S.A. Akinlabi, Sunir Hassan, and Esther T. Akinlabi
Elsevier
Rasheedat M. Mahamood, Tien-Chien Jen, Stephen A. Akinlabi, Sunil Hassan, and Esther T. Akinlabi
Elsevier
A. A. Adediran, F. A. Olanrewaju, O. S. Adesina, K. K. Alaneme, E. T. Akinlabi, and R. M. Mahamood
Informa UK Limited
ABSTRACT The present study reports on the mechanochemical processing and characterisation studies of Si-based refractory compounds derived from sugarcane bagasse (SCB). SCB was preliminarily washed and sun-dried for 48 hr. 1 M HCl acid was used for the leaching of the SCB, before which carbothermal treatment was carried out in an enclosed, improvised crucible using a temperature sequence of 600–1000°C at a heating rate of 10°C/min. Fourier transmission infrared spectrometer (FTIR), scanning electron microscope (SEM) and X-ray diffractometer (XRD) were used to characterise the reaction products. From the results obtained, the major functional groups indicated in the IR spectra are O-H, N-O, O-Si-O and Si-C. The carbothermal treatment showed the viability of producing an Si-based refractory compound (SBRC). There is a high population of SiC in the XRD pattern at 900°C, indicating that 700°C was not sufficient for the full transformation of the SiC phases. The results indicate the presence of unreacted carbon phase precipitates in the reaction product.
Kamardeen O. Abdulrahman, Rasheedat M. Mahamood, Esther T. Akinlabi, and Adeolu A. Adediran
Informa UK Limited
ABSTRACT In this work, titanium aluminide alloy have been fabricated via the laser deposition technique. The effect of some selected deposition parameters on the microstructure and mechanical properties of produced deposits were studied. The relationship between the laser power, and the microhardness of deposited samples on laser preheated substrate showed an incremental change in laser power from 200 to 600 W. This led to an overall decrease in microhardness of deposited samples from 426 to 373 HV. Sample deposited at 500 W gave the lowest Icorr of 1.8 x 10-8 and the highest Ecorr of -0.138 V. It is evident from the nanoindentation results that indentation modulus and stiffness of sample deposited at 600 W laser power had a lower value compared with 400 W laser power. However, the modulus of both samples fell within titanium alloy modulus range between 105-120 GPa. The microstructures of the deposits are mainly characterized with γ-TiAl and α2-Ti3Al phases and an improved hardness property almost two times higher than that of commercially pure titanium were achieved. It was concluded that changes in the laser power directly causes changes in the microstructure, hardness, stiffness, modulus of elasticity and corrosion resistance of the deposits.
J. Nyika, F.M. Mwema, R.M. Mahamood, E.T. Akinlabi, and Tc Jen
Informa UK Limited
ABSTRACT Additive manufacturing use is on a rising trend and is set to revolutionise contemporary industrialisation activities. The technology uses a variety of materials with unique mechanical and chemical properties making production faster, customised and easier compared to conventional manufacturing approaches. The 3D printing technology results to environmental impacts such as release of emissions and particulate matter, energy inefficiencies and production of recalcitrant wastes. The qualitative and quantitative assessment the impacts is not well understood. To bridge this gap, this research conducted a scientometric analyses on research done regarding the environmental impacts of additive manufacturing using the VOSviewer software and data derived from the Web of Science database. Findings indicated exponential growth in publications with the Journal of Cleaner Production being the best publisher on the topic. Research and publication was scarce in developing countries due to limited financial and human capacity. Developed countries such the USA, Italy and China were lead publishers. The study emphasised the need to expand collaborative research on the environmental effects of 3D printing technology globally owing to its role in enhancing industrialisation and the need to adapt and mitigate climate change.
C. Obara, H. Shagwira, Rm Mahamood, T.C. Jen, E.T. Akinlabi, J.O. Obiko, and F.M. Mwema
Informa UK Limited
ABSTRACT In this study, multidirectional forging (MDF) process parameters were optimised using Taguchi analysis and response surface methodology (RSM) for damage and effective strain. The parameters considered in the study were: temperature, friction coefficient, strain per pass, and die speed. Aluminium alloy 7075 (AA 7075) was used as a specimen for analysis during MDF processing. The output responses selected were maximum damage and effective strain. The MDF was undertaken at four levels for each input parameter. The Taguchi L16 orthogonal array was used to determine the interaction of the inputs and the contribution of the parameters. Simulations of the process were carried out on Deform 3D software. The analysis of variance demonstrated that the contribution of strain per pass was the most significant in causing damage and an increment in effective strain. Temperature and die speed were shown to have minimal effects on the outputs. The confirmation simulations demonstrated that the optimal solutions obtained by the Taguchi method had damage of 1.29, and the effective strain was 2.88. The RSM results were 0.19984 and 4.02193 for damage and effective strain, respectively.
J. Nyika, F.M. Mwema, R.M. Mahamood, E.T. Akinlabi, and TC Jen
Informa UK Limited
ABSTRACT Additive manufacturing is one of the most promising contemporary technologies with the ability to revolutionise, fasten, customise and decentralise manufacturing. This short review explores the technology in reference to its environmental impacts and suggests solutions to reduce negative impacts. 3D printing was claimed to reduce energy consumptions and carbon dioxide emissions compared to conventional machining technologies. These advantages, however, depend on the printing technology and material used. 3D printing has been suggested to be energy inefficient, produce waste from support beds and low-quality prints and emit particulate matter and toxic volatile organic compounds, which are harmful to the environment and human health. Metals were found to be the most recyclable and most suitable for an optimised circular economy adopting additive manufacturing. To reduce these impacts, it is prudent to minimise active print time per product, reduce the idling time of printers, use greener, biodegradable or recyclable printing materials and optimise the printing orientation and geometrics to prevent material wastage.
T. H. Sibisi, M. B. Shongwe, O.T. Johnson, R. M. Mahamood, S. Akinlabi, S. Hassan, Hongbiao Dong, Keith F. Carter, and E.T. Akinlabi
Informa UK Limited
ABSTRACT Aluminium metal matrix surface composites are gaining more attention in industries such as aerospace, marine and defence, due to the improved hardness, strength, ductility and better resistance to corrosion. In this study, Al/Ni–40Fe–10Ti surface composites were fabricated using friction stir processing (FSP) and the effect of tool rotational speed and transverse speed on the microstructural and mechanical properties was studied. Processing parameters chosen for the experiment are tool rotational speeds between 600 rpm and 1000 rpm, and transverse speeds between 70 mm/min and 210 mm/min. The results show that at a tool rotational speed of 1000 rpm and at transverse speeds of 140–210 mm/min, the hardness values were found to be improved significantly from 38 Hv of the base metal to 41 Hv of the friction stir processed (FSPed) surface. The tensile strength was also found to be improved in a sample produced at a rotational speed of 1000 rpm and transverse speed of 70 mm/min. Tool rotational speed and transverse speed have a greater influence on the mechanical properties of friction stirred process surface because of the high heat input generated in the weld region causing proper mixing and incorporation of the reinforcing Ni–40Fe–10Ti powder.
F.M. Mwema, J.O. Obiko, R.M. Mahamood, A.A. Adediran, Michael Bodunrin, E.T. Akinlabi, and TC Jen
Informa UK Limited
ABSTRACT This study reports on the forging simulation of P91 steel at a temperature range of 900–1200°C and a strain rate range of 1–15 s−1 using Deform 3D finite element software. The study investigated the effect of forging parameters on metal flow behaviour. The flow stress increased with increasing strain rate at a given temperature, whereas at a constant strain rate, the flow stress decreased with increasing temperature. The results established that metal flow behaviour depends on the process parameters. By substituting flow stress values in the Arrhenius equations, stress exponents “n”and activation energy “Q” were derivedas 5.38 and of 572.89 kJmol−1respectively. A constitutive model for predicting flow stress over a wide range of forging conditions tested was developed. The model was verified by using statistical parameters: correlation coefficient R and average absolute relative error AARE. From the statistical analysis, the values were: R = 0.994 and AARE = 2.988%. The study demonstrates that the FEM simulation model can be applicable in performing, analysing and evaluating industrial metal forming processes.