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South African Journal of Industrial Engineering
The South African Journal of Industrial Engineering publishes articles with the emphasis on research, development and application within the field of Industrial Engineering. In this way it aims to contribute to the further development of this field of study and to serve as a vehicle for the effective interchange of knowledge, ideas and experience between the research and training oriented institutions and the application oriented industry.
| Publisher | South African Institute of Industrial Engineers (SAIIE) |
|---|---|
| Frequency | Bi-annually |
| Coverage | Vol 13 Issue 1 2002 - current |
| Accreditation(s) |
Department of Higher Education and Training (DHET) SciELO SA Science Citation Index (Web of Science (WoS) Core Collection) |
| Language | English |
| Journal Status | Active |
| Collection(s) |
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Tensile and high cycle fatigue properties of annealed TI6AL4V (ELI) specimens produced by direct metal laser sintering
More LessThe tensile and high cycle fatigue (HCF) properties of high temperature annealed (HTA) direct metal laser sintered (DMLS) Ti6Al4V extra low interstitial (ELI) machined and polished specimens were investigated. The HTA heat treatment of the specimens resulted in the nucleation and growth of the alpha and beta grains from the acicular 𝛼′ martensite grains, improving their elongation to failure. The specimens were micro-CT scanned in an attempt to relate the pores in the specimens to their fatigue properties. The micro-CT pore information from suspected crack initiation pores on the surfaces of eventual fracture was used to calculate the stress intensity factors, which correlated well with the decreasing cycles to failure of the fatigue test specimens for all three build directions. Three representative specimens were analysed, and the ‘killer pore’ was identified in each micro-CT scan and fractograph, all of which were proximal to the surface of the specimen.
Die trek- en hoë-siklus vermoeidheidseienskappe van hoë temperatuur uitgegloeide direkte metaal lasergesinterde Ti6AL4V ekstra lae interstisiële gemasjineerde en poleerde monsters is ondersoek. Die spesifieke hitte behandeling van die monsters het gelei tot kernvorming en groei van alfa en beta korrels van die naaldvormige 𝛼′ martensiet korrels; dit het hul verlenging voor faling verbeter. Die monsters is op ʼn mikroskaal skandeer in ʼn poging om ʼn verband te vind tussen die porieë in die monsters en hul vermoeidheidseienskappe. Die porie inligting van vermoede kraakinisiëring porieë op die oppervlakke en gevolglike verbreking is gebruik om die spanningintensiteit te bereken. Dit het korreleer met die verminderde siklusse tot faling van die monsters vir al drie bou rigtings. Drie verteenwoordige monsters is analiseer en die porie waar die kraking begin het, is in elke geval identifiseer. Al hierdie gevalle was proksimaal tot die oppervlak van die monster.
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Variation of impact toughness of as-built DMLS Ti6Al4V (ELI) specimens with temperature
More LessThe response of direct metal laser sintering (DMLS) produced Ti6Al4V (ELI) to impact was investigated using an instrumented Charpy impact test machine and V-notch specimens. Impact toughness testing was conducted over the temperature range of -130ºC to 250ºC. The effect of the orientation of the V-notch, with reference to the base plate, was investigated. The results indicated that the samples that were produced with the V-notch facing the base plate (LO) had better values of impact toughness than those that were produced with the V-notch facing away from the base plate (UP) over most of the test temperatures. The study further established that as-built DMLS Ti6Al4V (ELI) retains appreciable notch toughness, even at extremely low temperatures.
Die impakreaksie van Ti6Al4V (ELI) gebou deur direkte metaal laser sintering (DMLS) is ondersoek deur gebruik te maak van ʼn geïnstrumenteerde Charpy impak toetsmasjien en V-keep toetsmonsters. Impak-taaiheidstoetse is uitgevoer oor ʼn temperatuurbereik van -130ºC tot 250ºC. Die effek van die V-keep oriëntasie relatief tot die basisplaat is ondersoek. Die resultate het aangedui dat die toetsmonsters wat gebou is sodat die V-keep na die basisplaat front (LO), beter impak-taaiheid getoon het as die wat gebou is sodat die V-keep weg van die basisplaat front (UP), vir die meeste van die toetstemperature. Verder het die studie bevestig dat soos-geboude DMLS Ti6Al4V (ELI) beduidende keep-taaiheid behou, selfs by uiters lae temperature.
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Evaluating the suitability of alumide tooling for injection moulding of different polymers
More LessThis paper describes the possibility of using laser-sintered Alumide® as an alternative material for producing rapid tooling (RT) inserts. To determine the durability of Alumide® inserts for the injection moulding (IM) process, a product with geometrical features was developed, and Alumide® inserts were manufactured. Polypropylene (PP), acrylonitrile-butadiene-styrene (ABS), polycarbonate (PC), and polyamide 6 (PA 6) were used for IM trials with the Alumide® inserts. From these trials, it was concluded that polymer materials with a processing temperature of about 230 ºC, similar to PP and ABS, can be used with Alumide® inserts as RT inserts for the IM process.
Hierdie artikel beskyf die moontlikheid om laser gesinterde Alumide® as ʼn alternatiewe proses vir die vervaardiging van snel hibried-gietvorms te gebruik. Om die duursaamheid van Alumide® as gietvorms te ondersoek in die plastiek spuitgiet proses, is ʼn produk met spesifieke geometriese vorms ontwerp en Alumide® gietvorms vervaardig. Polipropileen (PP), akrielonitriel-butadiene stireen (ABS), polikarbonaat (PC), en polyamide 6 (PA 6) is gebruik gedurende die plastiek spuitgiet proewe met die Alumide® gietvorms. Resultate van die proewe dui daarop dat plastiek materiale met prosesseringstemperature van ongeveer 230 ºC, soortgelyk aan PP en ABS, geskik is vir gebruik met Alumide® gietvorms in die plastiek spuitgiet proses.
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Warm-start heuristics for solving the passive optical network planning problem
More LessThe use of automated network planning systems is crucial for reducing the deployment cost and planning time of passive optical telecommunication networks. Mixed integer linear programming is well suited for the purpose of modelling passive optical networks; however, excessive computing times for solving large-scale problem instances render these approaches impractical. In this paper, an arc-based, a path-based, and a composite integer linear programming formulation of the passive optical network planning problem are considered. A reduction in computing times and peak memory usage is obtained by applying multiple heuristics as warm-starts to these problem formulations. Finally, the computational results presented in this paper are based on real-world Geographic Information System data — more specifically, a neighbourhood in Potchefstroom, South Africa.
Die gebruik van geoutomatiseerde netwerkbeplanningstelsels is noodsaaklik om die ontplooiingskostes en beplanningstyd van passiewe optiese telekommunikasienetwerke te verminder. Alhoewel gemengde heeltallige lineêre programmering benaderings geskik is vir die modellering van passiewe optiese netwerke, die rekenaarvereistes ten opsigte van verwerkingstyd veroorsaak dat hierdie benaderings onprakties is. In hierdie artikel word ʼn skakelgebaseerde, ʼn padgebaseerde en ʼn saamgestelde lineêre programmering benadering voorgestel. Die resultate toon dat ʼn verbetering in verwerkingstyd asook geheue gebruik is moontlik deur die gebruik van heuristiek wat begin oplossings genereer vir die voorgestelde probleem formulerings. Die resultate in hierdie artikel is gebaseer op werklike Geografiese Inligtingstelsel data, spesifiek data van ʼn woonbuurt in Potchefstroom, Suid-Afrika.
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A systematic review of 3PLs’ entry into reverse logistics
More LessThe concepts of Industry 4.0 and closed loop supply chains are becoming popular as logistics management evolves. Industry 4.0, through its instruments such as cloud manufacturing and the Internet of Things, has been known to improve operations management significantly. At the same time, closed loop supply chains have gained momentum with the increase in environmental sustainability issues. However, closed loop supply chains are often associated with uncertainties in the timing, quality, and quantity of returns. For these and other reasons, most organisations employ third parties to perform most reverse logistics activities. This paper systematically reviews the literature on the entry and use of third parties in reverse logistics with the objective of providing researchers with future research directions for this fast-emerging topic. The results show that there is a need to expand on the literature and on managerial issues such as performance measurement of reverse logistics networks with third parties. The literature also needs to consider how third parties use technological aspects such as Industry 4.0 to manage and operate reverse supply chains successfully.
Die konsepte van industrie 4.0 en geslote voorsieningskettings word al hoe meer gewild soos logistieke bestuur ontwikkel. Dit is bekend dat Industrie 4.0, deur middel van instrumente soos wolkvervaardiging en die Internet van Dinge, bedryfsbestuur beduidend kan verbeter. Terselfdertyd het geslote voorsieningskettings momentum gekry met die toename in omgewingsvolhoubaarheidskwessies. Geslote voorsieningskettings word egter dikwels geassosieer met onsekerhede in die tydsberekening, kwaliteit en hoeveelheid opbrengste. Om hierdie en ander redes gebruik die meeste organisasies derde partye om die meeste omgekeerde logistieke aktiwiteite uit te voer. In hierdie artikel word die literatuur oor die toetrede en gebruik van derde partye in omgekeerde logistiek hersien, met die doel om navorsers toekomstige navorsingsaanwysings vir hierdie vinnig opkomende onderwerp te verskaf. Die resultate toon dat daar behoefte is aan die uitbreiding van die literatuur en bestuursvraagstukke soos prestasiemeting van omgekeerde logistieke netwerke met derde partye. Die literatuur moet ook oorweeg hoe derde partye tegnologiese aspekte soos Industrie 4.0 gebruik om voorsieningskettings suksesvol te bestuur en te bedryf.
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A systematic review of the due diligence stage of mergers and acquisitions : towards a conceptual framework
More LessOrganisations are under constant pressure to grow in the face of increased competition, changing conditions, and increasingly relaxed country and currency regulatory environments. In order to remain a player or an industry leader, it’s imperative for companies to achieve real growth. Mergers and acquisitions (M&A) are an external mechanism for organisations to achieve growth. There are different stages in the typical M&A transaction. The due diligence stage of a transaction is critical in evaluating whether to proceed with a deal. It provides essential information that is used in setting negotiating parameters, determining bid prices, and providing a basis for integration recommendations. The due diligence process, therefore, should be managed effectively to ensure a higher probability of success for the deal. A systematic literature review was undertaken to establish the key concepts behind due diligence. Due diligence is multidisciplinary in nature, thus a wide range of literature was reviewed to gain a holistic understanding of the process. Concepts identified during the review were then individually examined. Similar concepts were grouped together into a new concept. The outcome of this paper forms the basis of a conceptual framework that captures the key areas of due diligence, the due diligence process and principles.
Organisasies is deurlopend onder druk om te groei in die aangesig van verhoogde mededinging, veranderende omstandighede en toenemend verslapte land- en valuta-regulerende omgewings. Om hul status as ʼn rolspeler of industrieleier te handhaaf, is dit van kern belang vir organisasies om ware groei te behaal. Samesmeltings en verwerwings is ʼn eksterne meganisme vir organisasies om groei te behaal. Daar is verskillende stadiums in só ʼn transaksie. Die noulettendheidsondersoek stadium van ʼn transaksie speel ʼn kritiese rol in die voortgaanbesluitneming van ʼn ooreenkoms. Dit verskaf essensiële inligting wat gebruik word om onderhandelingspunte te stel, die vasstel van ʼn aanbod en die daarstelling van integrasie aanbevelings. Hierdie proses moet dus doeltreffend bestuur word om ʼn hoër waarskynlikheid van onderhandelingsukses te verseker. ʼn Stelselmatige literatuurstudie is onderneem om die sleutelkonsepte te formuleer. ʼn Noulettendheidsondersoek is multidissiplinêr van aard en dus beslaan die literatuurstudie ʼn noemenswaardige reikwydte om sodoende ʼn holistiese verstaan van die proses te bekom. Konsepte wat tydens die literatuurstudie identifiseer is, is saam gegroepeer om nuwe konsepte te vorm. Die resultaat is ʼn konseptuele raamwerk wat die sleutel areas van ʼn noulettendheidsondersoek saamvat.
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© Publisher: South African Institute of Industrial Engineers (SAIIE)
© Publisher: South African Institute of Industrial Engineers (SAIIE)