scholarly journals An Overview of Semisolid Processing of Aluminium Alloys

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
M. S. Salleh ◽  
M. Z. Omar ◽  
J. Syarif ◽  
M. N. Mohammed
Keyword(s):  
Automotive Industry ◽  
Aluminium Alloys ◽  
Raw Materials ◽  
Low Cost ◽  
New Technology ◽  
Research Work ◽  
Production Method ◽  
Semisolid Processing ◽  
Shaping Process ◽  
Feedstock Production

Semisolid metal processing (SSM) or thixoforming is a new technology that offers several advantages over liquid processing and solid processing. This process utilizes semisolid behavior as well as reduces macrosegregation, porosity, and forming forces during shaping process. A lot of research work has been carried out by various researchers in order to exploit the potential of this process to produce different products especially for automotive industry. This paper will summarise the rheological behavior of aluminium alloys in semisolid slurries, thixoformability of modified aluminium alloys, the effect of feedstock production method on mechanical properties, and the importance of developing low-cost raw materials for semisolid processing.

scholarly journals Smart Medical Nursing Care Unit based on Internet of Things for Emergency Healthcare

2021 ◽  
Vol 3 (4) ◽  
pp. 305-316
Author(s):  
S. Ayyasamy
Keyword(s):  
Nursing Care ◽  
Low Cost ◽  
New Technology ◽  
Research Work ◽  
Emergency Situation ◽  
Smart System ◽  
Nurse Care ◽  
Sensor Module ◽  
Sensor Control ◽  
First Time

Recently, the development and integration of various sensor control with smart intelligent unit is used in medical field through IoT. However, there is still a lot of space for growth in the medical and health industry's use of new technology. The traditional nurse care unit is managed through medical staffs, and the expanding medical demands creates the hospital’s patients records to be updated inefficiently. Since this is now an urgent need, developing a realistic, smart medical nursing care unit at low cost with a system capable of facilitating the effective and convenient administration of medical staff has taken a new significance. The proposed framework, conducted in the analysis to monitor medical records and activities of the emergency care unit patients, functions as a nurse and gives patients the nurse care satisfaction. The patients' actual location may be obtained for the first time by cloud computing based smart system. The precise location of the patient is critical to rescue the patient in emergency situation. This research work illustrates that the intelligent nurse care unit is the main phase called Smart Medical Nursing Care (SMNC). It contains several sensor units and by the combination of many sensors in the sensor module, it takes very less reaction time to connect or communicate both sides i.e., between patients and medical staffs.

scholarly journals Influence of rivet length on joint formation on self-piercing riveting process considering further process parameters

2021 ◽  
Author(s):  
Fabian Kappe ◽  
Christian Roman Bielak ◽  
Vadim Sartisson ◽  
Mathias Bobbert ◽  
Gerson Meschut
Keyword(s):  
Process Parameters ◽  
Automotive Industry ◽  
Raw Materials ◽  
Numerical Study ◽  
Research Work ◽  
High Load ◽  
Continuous Increase ◽  
Wide Range ◽  
Riveting Process ◽  
The Individual

Driven by the CO2-emission law by the European government and the increasing costs for raw materials as well as energy, the automotive industry is increasingly using multi-material constructions. This leads to a continuous increase in the use of mechanical joining techniques and especially the self-piercing riveting is of particular importance. The reason for this is the wide range of joining possibilities as well as the high load-bearing capacities of the joints. To be able to react to changing boundary conditions, like material thickness or strength variation of the sheets, research work is crucial with regard to the increase of versatility. In this paper, a numerical study of the influences on the selfpiercing riveting process is presented. For this purpose, the influence of different process parameters such as rivet length and die depth on various quality-relevant characteristics were investigated. With the help of the design of experiment, significant influences were determined and interactions between the individual parameters are shown.

Experimental Study on the Effect of Mechanical Stirring in Semisolid Processing of Aluminum Alloys at Thixo-Temperatures

2015 ◽  
Vol 830-831 ◽  
pp. 41-44
Author(s):  
M.V. Kishore ◽  
D. Hanumantha Rao ◽  
M. Manzoor Hussain
Keyword(s):  
Process Parameters ◽  
New Technology ◽  
Solidus Temperature ◽  
Research Work ◽  
Semisolid Processing ◽  
Grain Refiner ◽  
Mechanical Stirring ◽  
Liquid Phases ◽  
Stirring Time ◽  
Static Conditions

Semisolid metal processing (SSMP) is a relatively new technology for production of near net shaped components. This process is carried out at a temperature range between its liquidus and solidus temperature. At thixo-temperatures, the metal exists as a mixture of solid and liquid phases in the slurry form. Thixotropy is a time-dependent shear thinning property where the metal is thick at static conditions but will flow when subjected to shear stress. The present research work focuses to identify the process parameters in SSMP. A mechanical stirring process was employed to obtain the desired microstructure required for SSMP. Process parameters such as stirring time and stirring speed were considered. The effect of addition of grain refiner to the molten alloy on the microstructure was also studied.

scholarly journals DESIGN OF A LI-FI TRANSCEIVER .

2020 ◽  
Vol 9 (12) ◽  
pp. 21-37
Keyword(s):  
Visible Light ◽  
Low Cost ◽  
New Technology ◽  
Research Work ◽  
Design Tool ◽  
Spectrum Efficiency ◽  
Digital Data ◽  
Light Spectrum ◽  
Video Signals ◽  
User Demand

The latest uproar in this era is about a technology termed as Light Fidelity or more commonly known as Li-Fi. There are currently two trends being seen: First, the extension or enrichment of wireless services and other being in-creased in user demand for these services, but the available RF spectrum for usage is very limited. So the new technology of Li-Fi came into picture, which uses visible light as a source of communication. Li-Fi is the most recent de-velopment which is resourceful. In this technology, LEDs are used to transmit data in the visible light spectrum. This technology can be compared with that of Wi-Fi and offers advantages like increased accessible spectrum, efficiency, security, low latency and much higher speed. This research paper aims at de-signing a Li-Fi transceiver using Arduino that is able to transmit digital data. The hardware has been designed using Eagle CAD (version 7.1.0) tool and Proteus design tool (version 8). The software coding is done by using Java (version 8). Successful transmission and reception of text, image and video signals is carried out on the transceiver. Hence this research work gives an innovative way of designing a transceiver which works by using off the shelf low cost components and using visible light spectrum.

Zinc Oxide Production Technology of Distillation Twice Based on Scrap Miscellaneous Zinc Materials

2014 ◽  
Vol 852 ◽  
pp. 36-39
Author(s):  
Qun Shan Liu ◽  
Jun Xia Yan
Keyword(s):  
Zinc Oxide ◽  
High Purity ◽  
Raw Materials ◽  
Low Cost ◽  
New Technology ◽  
Zinc Content ◽  
Metallic State ◽  
Iron And Steel ◽  
Wide Range ◽  
Easy Operation

By using scrap miscellaneouszinc materialas raw materials, a new technology with the help of two distillationsby fire method to produce zinc oxide was invented.The scrap miscellaneous zinc materialshave complex sources, containing dust, stone, iron and steel parts and other impurities, and zinc content is more than 15% over a wide range. The presence of zinc is in the form of pure metallic state, alloy state and oxidation state.Distillation process has two steps, the primary for removing the principal impurities and the second for zinc oxide purification. With less investment, low cost, simple equipment, easy operation, environmental protection and other advantages, this method is fit for production of high-purity zinc oxide and can also be used for the production of nanoscale high purity zinc oxide.

scholarly journals Straw/Nano-Additive Hybrids as Functional Fillers for Natural Rubber Biocomposites

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 321
Author(s):  
Justyna Miedzianowska ◽  
Marcin Masłowski ◽  
Przemysław Rybiński ◽  
Krzysztof Strzelec
Keyword(s):  
Natural Rubber ◽  
Raw Materials ◽  
Low Cost ◽  
Reference Sample ◽  
Combustion Process ◽  
Production Method ◽  
Halloysite Nanotubes ◽  
Cereal Straw ◽  
Hybrid Fillers ◽  
The Impact

Currently, up to 215 million metric tons of harvestable straw are available in Europe, 50% of the crops come from wheat, 25% from barley and 25% from maize. More than half of the production remains undeveloped. The overproduction of straw in the world means that the current methods of its management are insufficient. The article describes the production method and characterization of natural rubber biocomposites containing cereal straw powder modified with functional nano-additives in the form of carbon black, silica and halloysite nanotubes. The use of cereal straw in the elastomer matrix should contribute to obtaining a product with good mechanical properties while ensuring a low cost of the composite. In turn, the application of the mechanical modification process will allow the combination of specific properties of raw materials to obtain new, advanced elastomeric materials. As part of the work, hybrid fillers based on mechanically modified cereal straw were produced. The impact of hybrid fillers on mechanical, rheometric and damping properties was assessed. The flammability and susceptibility of the obtained biocomposites to aging processes were determined. The use of hybrid fillers based on mechanically modified straw allowed us to obtain a higher cross-linking density of vulcanizates (even up to 40% compared to the reference sample), and thus higher values of the rheometric moment during the vulcanization process of rubber mixtures (from approx. 10% (10 phr of filler) up to 50% (30 phr of filler) in relation to the unfilled system) and higher hardness of vulcanizates (by about 30–70%). The curing time of the blends was slightly longer, but the obtained composites were characterized by significantly higher tensile strength. The use of fillers in the elastomer matrix increased the modulus at 100, 200 and 300% and the elongation at break. Moreover, greater resistance of vulcanizates to the combustion process was confirmed.

scholarly journals Use of Acoustic Energy in Sand Casting of Aluminium Alloys

2013 ◽  
Vol 690-693 ◽  
pp. 2366-2370 ◽  
Author(s):  
Hélder Puga ◽  
Joaquim Barbosa ◽  
Joana Oliveira
Keyword(s):  
Aluminium Alloys ◽  
Low Cost ◽  
Die Casting ◽  
Research Work ◽  
High Strength ◽  
Casting Process ◽  
Analysis Data ◽  
Acoustic Energy ◽  
Coarse Microstructure ◽  
Die Casting Process

During the last years, some researchers have focused the development of ultrasonic microstructure refinement /modification techniques of die-casting aluminium alloys, to improve their properties. The developed techniques are highly efficient when applied to the die-casting process, but their capability with sand and ceramic moulding are unknown. Sand/ceramic aluminium castings are prone to coarse microstructure, porosities and inclusions due to low cooling rates and turbulent gravity pouring, and suitable processing techniques are required to eliminate those drawbacks. This article reports some results of a research work aiming the development of a reliable, low-cost and environmentally friend casting process, for geometrically complex and massive high strength sand/ceramic aluminium castings, to eliminate traditional soundness related defects and simultaneously promote the development of refined microstructures. The article presents the effect of applying ultrasound to AlSi9Cu3 alloy during solidification on a sand mould on the resultant microstructure. Results include microstructure characterization and its relationship with thermal analysis data collected from the center of the cast samples during cooling.

Thixoforming of Aluminium-Silicon Alloys in a Mechanical Eccentric Press

2008 ◽  
Vol 141-143 ◽  
pp. 517-522 ◽  
Author(s):  
Eugênio José Zoqui ◽  
Luciano A. Lourençato ◽  
Davi M. Benati
Keyword(s):  
Shear Rate ◽  
Mechanical Behaviour ◽  
Silicon Content ◽  
Raw Materials ◽  
Morphological Evolution ◽  
Low Cost ◽  
Raw Material ◽  
Semisolid State ◽  
Semisolid Processing ◽  
Silicon Alloys

The semisolid processing technology is not widely used due to the high cost of raw material and the equipment it requires. New low-cost raw materials and processes could be the key to expand the use of this technology. This paper describes an initial effort to develop new Al-Si-Mg in terms of raw material production and processing. The morphological evolution of all the alloys produced was characterized during their reheating to the semisolid state at 45 and 60% solid fraction, as well as the semisolid behaviour in terms of viscosity versus shear rate. The adaptation of the semisolid technology to the thixoforming process via eccentric press was tested using an equipment up to 25 tons. This type of equipment is not commonly employed in this kind of processing. Results indicate that alloys with low silicon content, e.g., 2 or 4wt%Si, behave similarly to alloys with 7wt%Si, which are normally used in the thixoforming process, with a viscosity of about 2 * 105 Pa.s. The semisolid behaviour of low silicon alloys indicates the potential expansion of the range of raw materials for this application. Thixoforming of semisolid materials in an eccentric press appears to be a very promising technology, yielding parts that, despite their simplicity and restricted shape, display a very good final mechanical behaviour.

Fatigue Curves for Aluminium Alloys and their Welded Joints Used in Automotive Industry

2017 ◽  
Vol 885 ◽  
pp. 86-91 ◽  
Author(s):  
János Lukács ◽  
Ákos Meilinger ◽  
Dóra Pósalaky
Keyword(s):  
Automotive Industry ◽  
Welded Joints ◽  
Aluminium Alloys ◽  
High Cycle Fatigue ◽  
Research Work ◽  
Step Method ◽  
Staircase Method ◽  
Friction Stir ◽  
Base Materials ◽  
Crack Paths

Our research work has focused from the materials world on the aluminium alloys, from the manufacturing processes on the welding technologies, and from different loads on the cyclic loads. The article aimed (i) to demonstrate the behaviour of the friction stir welded (FSW) joints under cyclic loading conditions; (ii) to determine fatigue (limit) curves for two aluminium alloys and their welded joints. Experiments were performed on 5754-H22 and 6082-T6 aluminium alloys and their FSW joints. Both high cycle fatigue (HCF) and fatigue crack propagation (FCG) tests were executed on both base materials and their welded joints. Statistical behaviour of the base materials and welded joints was represented by the cutting of the specimens and the using of different crack paths. HCF limit curves were determined based on staircase method and FCG limit curves can be determined by own developed six step method. The investigations and their results were compared with each other and with the results can be found in the literature.

scholarly journals Microbial polyhydroxybutyrate production by using cheap raw materials as substrates

2016 ◽  
Vol 4 (01) ◽  
pp. 57-62 ◽  
Author(s):  
G. Mahitha ◽  
R. Jaya Madhuri
Keyword(s):  
Wheat Bran ◽  
Production Cost ◽  
Raw Materials ◽  
Low Cost ◽  
Research Work ◽  
Orange Peel ◽  
Environmental Friendliness ◽  
Fermentative Production ◽  
High Production ◽  
High Production Cost

Bioplastic, Polyhydroxybutyrate (PHB) is well known for it’s environmental friendliness and complete decomposition into water and carbon dioxide by microorganisms. The main drawback of PHB commercialization is it’s high production cost which is 10 times higher than that of synthetic plastic. So, the present research work mainly focussed on the fermentative production of PHB by Bacillus amyloliquifaciens and Nocardiopsis potens using low cost raw materials like Molasses, wheat bran, rice bran, ragi bran, jambul seed powder, orange peel and whey as substrates. Bacillus amyloliquifaciens and Nocardiopsis potens gives maximum PHB 16.5 µg/ ml and 26.8 µg/ ml respectively in the medium containing molasses and wheat bran as a substrates. Further the functional groups of extracted PHB were confirmed by Fourier transform infrared spectroscopy.

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