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Browsing by Cluster "Manufacturing"

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Coupled heat transfer, fluid flow and solidification kinetics for laser additive manufacturing applications

Author: Khomenko, MD ; Makoana, Nkutwane W ; Pityana, Sisa L ; Mirzade, FKH Date: Jul 2021 A new coupled heat transfer and solidification kinetics model is developed for the optimization of microstructure during laser additive manufacturing applications. The Johnson–Mehl–Avrami–Kolmogorov equation is applied in a self-consistent ... Read more
Detection of mycobacterium tuberculosis using gold nanoparticles conjugated to TB antibodies

Author: Maphanga, Charles P ; Manoto, Sello L ; Ombinda-Lemboumba, Saturnin ; Mthunzi-Kufa, Patience Date: Mar 2021 In recent years, conjugated nanoparticles have gained significant applications in diagnostics, particularly gold nanoparticles (AuNPs). When functionalized with antibodies, AuNPs can selectively interact with cells and biomolecules. The ... Read more
Effect of LSP parameters on the corrosion and hardness properties of TI6Al4V

Author: Kubjane, SM ; Arthur, Nana KK ; Masina, Bathusile N ; Popoola, API ; Pityana, Sisa L Date: Sep 2019 Because of its low density, high corrosion resistance and high strength to weight ratio, titanium and its alloys are widely used in aerospace applications. As a result, the material is exposed to detrimental environment. An enhancement in ... Read more
The effect of porosity on the mechanical properties of Ti-6Al-4V components manufactured by high-power selective laser melting

Author: Mathe, Ntombizodwa R ; Tshabalala, Lerato C ; Hoosain, Shaik ; Motibane, Londiwe P ; Du Plessis, A Date: Jul 2021 Metal powder bed fusion in additive manufacturing is gaining interest as a manufacturing technique for complex metal parts in the aerospace, rail, and automotive industries. This has led to an emergence of 3D printers in the market to accelerate ... Read more
The effect of solution treatment on the microstructure and mechanical properties of as-cast Ti-Mo alloys

Author: Moshokoa, Nthabiseng ; Raganya, Mampai L ; Obadele, BA ; Olubambi, PA ; Machaka, Ronald Date: 2020 The present study investigates the effect of solution treatment on the microstructure and mechanical properties of as-cast Ti-Mo alloys. The two alloys (Ti-8Mo and Ti-9Mo) were fabricated using a commercially available Arc re-melting furnace. ... Read more
Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651

Author: Sanchez, AG ; You, C ; Leering, M ; Glaser, Daniel ; Furfari, D ; Fitzpatrick, ME ; Wharton, J ; Reed, PAS Date: Nov 2020 A laser shock peening (LSP) treatment was performed on AA7075-T651 for maximum fatigue improvement. Surface and microstructural characterisation techniques (micro-hardness, SEM-EBSD, contact-profilometry) showed LSP surface modification was ... Read more
Exploring optical spectroscopic techniques and nanomaterials for virus detection

Author: Manoto, Sello L ; El-Hussein, A ; Malabi, Rudzani ; Thobakgale, Setumo L ; Ombinda-Lemboumba, Saturnin ; Attia, YA ; Kasem, MA ; Mthunzi-Kufa, Patience Date: Aug 2020 Viral infections pose significant health challenges globally by affecting millions of people worldwide and consequently resulting in a negative impact on both socioeconomic development and health. Corona virus disease 2019 (COVID-19) is a ... Read more
Gelatine-based biosensor for molecular screening of aspirin and paracetamol via surface enhanced Raman spectroscopy

Author: Thobakgale, Setumo L ; Manoto, Sello L ; Ombinda- Lemboumba, Saturnin ; Mthunzi-Kufa, Patience Date: Feb 2020 Polypeptide gelatine has been used extensively in microbiology to enhance cellular adhesion and growth. Likewise, fabrication of biochemical sensors using a variety of organic material and nanomaterials is a growing research area particularly ... Read more
Generating Greenberger-Horne-Zeilinger states with squeezing and postselection

Author: Alexander, B ; Bollinger, JJ ; Uys, Hermann Date: Jun 2020 Many quantum state preparation methods rely on a combination of dissipative quantum state initialization followed by unitary evolution to a desired target state. Here we demonstrate the usefulness of quantum measurement as an additional tool ... Read more
Impact of DED process parameters on the metallurgical characteristicsof 17-4 PH SS deposited using DEDI

Author: Mathoho, I ; Akinlabi, ET ; Arthur, Nana KK ; Tlotleng, Monnamme Date: Aug 2020 This study investigated the influence direct energy deposition (DED) process parameters have on the metallurgical characteristics (porosity, microstructural evolution, microhardness, and corrosion behavior) of 17−4 PH stainless steel powder. ... Read more
Investigation of martensite a’ phase transformation during heat treatment of high-speed selective laser melted Ti6Al4V components

Author: Lekoadi, Paul M ; Maledi, N ; Tlotleng, Monnamme ; Masina, Bathusile N Date: Feb 2020 The investigation of microstructural and hardness properties of high-speed selective laser melted (SLM) produced Ti6Al4V coupons after various heat treatments. Heat treatment was performed in order to homogenize and improve the microstructure ... Read more
Investigation of the tensile properties of heat treated Ti-Mo alloys

Author: Raganya, Mampai L ; Moshokoa, Nthabiseng ; Obadele, BA ; Olubambi, PA ; Machaka, Ronald Date: 2020 Extensive efforts have been undertaken to develop Ti alloys consisting of single ß phase in order to substitute the a + ß phase in Ti-6Al-4V used as biomaterials. This study was aimed at investigating the tensile properties of solution treated ... Read more
Label-free detection of mutations in the HIV genome using a surface plasmon resonance biosensor

Author: Lugongolo, Masixole Y ; Manoto, Sello L ; Maphanga, Charles P ; Ombinda-Lemboumba, Saturnin ; Thobakgale, Setumo L ; Mthunzi-Kufa, Patience Date: Mar 2021 Surface plasmon resonance (SPR) biosensors are optical materials that measure changes in the refractive index as they monitor non-covalent molecular interactions in real time. These utilise a label free analytical approach, which does not ... Read more
Laser based manufacturing of Ti6Al4V: A comparison of LENS and selective laser melting

Author: Arthur, Nana KK Date: Apr 2019 The laser engineered net shaping (LENS) system was used for the laser based manufacturing of a test geometry used to assess the performance of additive manufacturing systems. This system was preferred over a selective laser melting (SLM) ... Read more
Leapfrog and optimal kinodynamic motion planning

Author: Matebese, Belinda T ; Withey, Daniel J ; Banda, MK Date: Sep 2020 The motion planning for a mobile, autonomous system is solved using the Leapfrog algorithm from optimal control. Numerical optimal control has some advantages for motion planning. Differential constraints can be included in the problem ... Read more
Metallurgical characteristics of laser peened 17-4 PH SS processed by LENS technique

Author: Mathoho, Ipfi ; Akinlabi, ET ; Arthur, Nana KK ; Tlotleng, Monnamme ; Masina, Bathusile N Date: Mar 2019 This study investigated the effect of laser peening on the surface integrity (surface roughness, microstructure and microhardness) of 17-4 PH stainless steel components which were built through the direct energy deposition (DED). Additive ... Read more
Microstructural and mechanical properties of Ti-Mo alloys designed by the cluster plus glue atom model for biomedical application

Author: Moshokoa, Nthabiseng ; Raganya, Mampai L ; Obadele, BA ; Machaka, Ronald ; Makhatha, ME Date: Oct 2020 β-type titanium alloys are acquiring research interest in orthopaedic applications because of their exceptional properties such as moderate strength, good biocompatibility and corrosion resistance, high ductility and low elastic modulus. The ... Read more
Microstructural response of Ti6Al4V ELI alloyed with molybdenum by direct energy deposition

Author: Arthur, Nana KK ; Siyasiya, C ; Pityana, Sisa L ; Tlotleng, Monnamme Date: May 2021 Alloy development opens the way to create new materials for specialized processes, and attain materials that are usually difficult to acquire. Property enhancements and part performance is achievable in an exciting new way when this technique ... Read more
Microstructure and microhardness characterization of Cp-Ti/SiAlON composite coatings on Ti-6Al-4V by laser cladding

Author: Sibisi, PN ; Popoola, API ; Kanyane, LR ; Fatoba, OS ; Adesina, OS ; Arthur, Nana KK ; Pityana, Sisa L Date: Mar 2019 Failure of engineering components on application is mainly a result of poor surface behavior of materials under certain conditions. Titanium and its alloys have numerous beneficial properties including light weight, high strength and excellent ... Read more
Morphological characterisation of recycled powder and microstructures of Ti-6Al-4V components synthesized by LENS additive manufacturing

Author: Sibisi, PN ; Popoola, API ; Arthur, Nana K ; Pityana, Sisa L ; Popoola, OM Date: Oct 2019 Direct Metal Laser Deposition (DMLD) processes such as LENS are gaining ground in commercial manufacturing processes of functional end-products. This is attributed to this process being popularized as a sustainable technology with the potential ... Read more

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