scholarly journals Design and Fabrication of Thermoplastic Moulds for Manufacturing CFRP Composite Impeller Blades

2020 ◽  
Vol 57 (1) ◽  
pp. 290-298
Author(s):  
Sorin Draghici ◽  
Ionut Sebastian Vintila ◽  
Radu Mihalache ◽  
Horia Alexandru Petrescu ◽  
Catalin Stelian Tuta ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Quality ◽  
Mechanical Characterization ◽  
Physical And Mechanical Properties ◽  
Full Scale ◽  
Composite Processing ◽  
Good Surface ◽  
Hardness Tests ◽  
Cfrp Composite ◽  
3D Printed

The main objective of this study was to investigate thermoplastic materials design and fabrication processes for manufacturing composite impeller blades. Polyurethane (Necuron) and ABS (3D printed) thermoplastics were chosen due to their good mechanical properties, tooling applications, easy manufacturing and lifetime. For both thermoplastics, workability and hardness tests were performed, as well as microstructural and mechanical characterization evaluating their physical and mechanical properties. A 1:2.5 scale mould was designed and milled from Necuron N651 and N1001 and used for manufacturing of 1:2.5 scale composite impeller blades. Also, 1:1 scale ABS mould components were 3D printed and used to manufacture full scale composite impeller blades. All composite impeller presented good surface quality and tolerances with respect to CAD design, thus answering to requirements related to composite processing

Influence of slicing parameters on surface quality and mechanical properties of 3D-printed CF/PLA composites fabricated by FDM technique

2021 ◽  
pp. 1-18
Author(s):  
N. Vinoth Babu ◽  
N. Venkateshwaran ◽  
N. Rajini ◽  
Sikiru Oluwarotimi Ismail ◽  
Faruq Mohammad ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Quality ◽  
3D Printed

scholarly journals Mechanical Characterization of Angustifolia Kunth and Rayada Amarilla Guadua Bamboo

2019 ◽  
Vol 303 ◽  
pp. 03002
Author(s):  
Brayan García ◽  
Camila Preciado ◽  
Mónica Bedoya ◽  
Oscar Mendoza
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characterization ◽  
Construction Material ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Fiber Direction ◽  
Three Point Bending ◽  
Compressive Stresses ◽  
Cylindrical Samples

Guadua is a Colombian endemic type of grass belonging to the bamboo family. It can be considered an alternative construction material due to its physical and mechanical properties, as well as a sustainable source of timber due to its fast growing process and high availability in tropical countries. The Guadua is composed by the stem petiole or lower part, the stem base, and the stem. In turn, the stem is divided into sections separated by diaphragms that form knots, called culms. The distance between knots and the structure of the longitudinal fibers in the culms depend on the age of the plant. This implies a difficulty when determining the mechanical properties of the stem, since there are not specific standards for this purpose. In this work the mechanical properties of young samples of Angustifolia Kunt and Rayada Amarilla Guadua, of around 6 years of growth, were characterized. To account for the natural variability introduced by the presence of diaphragms, cylindrical and prismatic samples were extracted without knot, with one knot in the middle, and with one knot at each end. Cylindrical samples were used to measure compressive strength parallel to the fiber direction, while prismatic samples were used to measure tensile strength also parallel to the fiber direction and flexural strength by three point bending. Methodologies from conventional construction materials were adapted for this purpose. The obtained results allowed concluding that the Guadua samples present different mechanical properties depending on the position of the knots. Samples with a knot in the middle are more resistant to compressive stresses, while the samples without knot are more resistant to flexural and traction stresses. The samples with one knot at each end presented a more balanced behavior, being efficient when exposed to compression, traction and flexural stresses.

scholarly journals Effect of Printing Parameters of 3D Printed PLA Parts on Mechanical Properties

2021 ◽  
Author(s):  
Jayakumar N ◽  
◽  
Senthilkumar G ◽  
Pradeep A D ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Design Method ◽  
Consumer Electronics ◽  
Disruptive Technology ◽  
Mean Values ◽  
Good Surface ◽  
3D Printed ◽  
Nozzle Temperature ◽  
The Way

Additive manufacturing significantly reduces the lead time of the product development cycle in the way of design trials and thus reduces delivery time to the market. The essence has been understood by many sectors including, education, manufacturing industries, automotive, medical, aerospace, consumer electronics, bio-medical and even fashion enthusiasts. It is used to prepare this PLA for the used plastics and landfills. By this way, it can reduce the plastics waste from the earth. Compare with ABS plastics, PLA plastics are cheaper. This disruptive technology going to the change the way of manufacturing goods and sets a new narrow path to the future industries. During usage of filament material, it’s got failure due to not enough quality printing because of not proper process parameters. Also, the printed part does not have good surface quality. So, the PLA material requires improved mechanical properties. The objective of this study is to create 3D printed parts with good quality with the optimized process parameters.The selected process parameters are infill density (%), Nozzle temperature (º) and print orientation. Taguchi orthogonal array (L9) design method has been chosen for generating design of experiments. The samples are produced according to its ASTM standards. The specimens were tested for identifying the mechanical properties like tensile strength, compression strength and impact strength. From the results obtained from the tests, taking the mean values and conclude the better infill density, orientation and the nozzle temperature the PLA.

scholarly journals Printability and properties of 3D-printed poplar fiber/polylactic acid biocomposite

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 2774-2788
Author(s):  
Zhaozhe Yang ◽  
Xinhao Feng ◽  
Min Xu ◽  
Denis Rodrigue
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Rheological Properties ◽  
Layer Thickness ◽  
Polylactic Acid ◽  
Physical And Mechanical Properties ◽  
Longitudinal Stripe ◽  
3D Printed ◽  
First Time ◽  
Printing Parameters

To efficiently and economically utilize a wood-plastic biocomposite, an eco-friendly biocomposite was prepared using modified poplar fiber and polylactic acid (PLA) via 3D printing technology for the first time. First, the effects of poplar fiber (0, 1, 3, 5, 7, and 9%) on the mechanical and rheological properties of the printed biocomposites were investigated. Subsequently, the printing parameters, including printing temperature, speed, and layer thickness, were optimized to obtain the biocomposite with superior properties. Finally, four printing orientations were applied to the biocomposite based on the optimized printing parameters to study the effect of filament orientation on the properties of the biocomposite. Favorable printability and mechanical properties of the biocomposite were obtained at 5% poplar fiber. The optimal printing temperature of 220 °C, speed of 40 mm/s, and layer thickness of 0.2 mm were obtained to produce the desired mechanical properties of the biocomposite with the printing orientation in a longitudinal stripe. However, the printing parameters should be chosen according to the applications, where different physical and mechanical properties are needed to achieve efficient and economical utilization of the biocomposites.

scholarly journals Substantiationofrules ofsimilarityofbreakingloadoftwistedfishinggear

2020 ◽  
Vol 0 (1) ◽  
pp. 38-45
Author(s):  
Alexander Alekseevich Nedostup ◽  
Pavel Nasenkov ◽  
Alexey Olegovich Razhev ◽  
Karina Konovalova ◽  
Sergey Fedorov
Keyword(s):  
Mechanical Properties ◽  
Large Scale ◽  
Large Diameter ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Breaking Load ◽  
Full Scale ◽  
Fishing Gear ◽  
Scale Modeling ◽  
Polyamide Fibers

The article focuses on the problem of physical modeling of the physical and mechanical properties of fishing twisted filamentary materials, in particular, the most important one – the breaking load. The problems arise because of conducting full-scale experiments, particularly when the ropes of large diameter are used to build the rope parts of fishing gear. The solution to the problem of determining the breaking load on filamentary parts can be found by using specialized tensile testing machines and modern software, which is an effective tool for predicting the reliability and a resource of a gear part operating in difficult conditions of dynamic and shock loads. However, de-signing of fishing gear must begin with large-scale modeling, which will help to correctly calculate the physical and mechanical properties of the designed object using the well-known parameters of the full-scale material. The similarity rules of breaking load of fishing twisted filamentary gear used for the construction of industrial fishing tools will make it possible to model new elements of these tools without conducting full-scale experiments. At the same time, they will already contain solutions to problems associated with studying the dynamic processes, deformation, fracture, as well as the prediction of reliability and resource of the material. The technique proposed based on determining the scale of similarity of filamentary gear made of polyamide fibers, will help to simu-late various net and rope elements from filaments gear of various sizes and structures, instead of conducting energy-intensive experimental studies on ropes of large diameter.

Microstructure and Mechanical Properties of Accumulative Roll Bonded AA6014/AA5754 Aluminium Laminates

2010 ◽  
Vol 667-669 ◽  
pp. 217-222 ◽  
Author(s):  
Tina Hausöl ◽  
Heinz Werner Höppel ◽  
Matthias Göken
Keyword(s):  
Mechanical Properties ◽  
Surface Quality ◽  
High Surface ◽  
Light And Electron Microscopy ◽  
High Strength ◽  
Band Formation ◽  
High Surface Quality ◽  
Good Surface ◽  
Ultrafine Grained ◽  
Elongation To Failure

Among the well-known methods of severe plastic deformation the accumulative roll bonding (ARB) process is most promising for producing ultrafine-grained (UFG) materials with extraordinary mechanical properties at an industrial scale. Besides, it has also been shown that the ARB process can be successfully used to produce multi-component materials with tailored properties by reinforcement or grading, respectively. In this work, laminates with alternating layers of the high strength aluminium alloy AA5754 and the AA6014 alloy, well-known for good formability and high surface quality, were produced by ARB at 230 °C. Microstructural and mechanical investigations were performed after 2, 4 and 6 ARB cycles by means of light and electron microscopy, nanoindentation experiments and tensile testing. After ARB processing an ultrafine-grained microstructure is obtained. The UFG microstructure as well as the local mechanical properties alter with the layer composition. With increasing number of ARB cycles the interfaces between the layers become more and more wavy by shear band formation. Compared to the pure accumulative roll bonded AA6014 the yield and ultimate tensile strength of the multi-component laminates are considerably higher and are only slightly reduced in comparison to the high strength AA5754. In terms of elongation to failure no reduction in ductility is found. The serrated yielding effect, clearly visible in AA5754, is shifted to higher strains or fully disappears, respectively, whereas in AA5754 the magnitude of serrations increases with increasing number of ARB cycles. Combining AA5754 and AA6014 sheets by ARB results in well bonded ultrafine-grained laminates which exhibit a combination of the beneficial properties of the single-component materials: high strength of AA5754 and good surface quality of AA6014.

scholarly journals Mechanical Characterization of Iroko Wood Using Small Specimens

Buildings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 116
Author(s):  
Carlos Cunha ◽  
Marina Tenório ◽  
Daniel F. Lima ◽  
Arthur Rebouças ◽  
Luís C. Neves ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characterization ◽  
Direct Method ◽  
Physical And Mechanical Properties ◽  
Ultrasonic Waves ◽  
Bending Properties ◽  
Republic Of The Congo ◽  
The Republic ◽  
Speed Of Propagation ◽  
Tropical Woods

Despite their favorable physical and mechanical properties for structural use, tropical woods, such as Iroko (Milicia excelsa), present knowledge gaps to be filled mainly about their mechanical characterization, which currently limit their use or result in under- or overdimensioned structural elements. Visual classification, one of the most used methods for characterizing wood, is inaccurate in the case of Iroko due to the wide variety of geographical locations in which this species can be found. In addition, mechanical characterization using test pieces with structural dimensions leads to high and impractical costs. In this context, this study aims to verify the mechanical properties of Iroko (imported from the Republic of the Congo) from small size specimens, a process that is currently standardized only for softwoods, and to verify the correlation of different properties through bending properties and ultrasound tests. Prior to the bending tests, the speed of propagation of ultrasonic waves was measured using the direct method. The results obtained show a good correlation between density and bending properties and the velocity of propagation of ultrasonic waves.

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