scholarly journals Creation of Sealed Strong Structures of Rocket and Space Equipment FDM Printing Methods by Ultem ™ 9085 Pei Plastic

2021 ◽  
Vol 5 (3) ◽  
Author(s):  
Oleksandr Salenko ◽  
Igor Derevianko ◽  
О. Samusenko ◽  
Kostyantin Avramov ◽  
O. Lithot ◽  
...  
Keyword(s):  
Shelf Life ◽  
Strength Properties ◽  
Space Technology ◽  
Printing Technology ◽  
Specific Strength ◽  
Properties Of Materials ◽  
Membrane Type

The work shows the possibility of manufacturing products for rocket and space technology using the additive FDM-printing technology. The object of research is the nozzle plugs of the "membrane" type. Considering the specific-strength properties of the product during its operation during operation, as well as the features of the FDM-process, the design was optimized, the regularities of the formation of its properties were established. An impregnation technology has been developed to seal the product. The equipment was designed, and pneumatic tests were carried out. The properties of materials were investigated considering their guaranteed shelf life for 12 years of operation under accelerated climatic tests. It is shown that the production of products by FDM-printing methods is promising and expedient, since the properties being formed are predictable, achievable, and stable.

scholarly journals About the possibility of creation of sealed strong structures of rocket and space equipment FDM printing methods

2021 ◽  
Author(s):  
Oleksandr Salenko ◽  
Kostyantyn Avramov ◽  
Іgor Derevianko ◽  
О. Samusenko ◽  
V. Rogulin ◽  
...  
Keyword(s):  
Shelf Life ◽  
Strength Properties ◽  
Space Technology ◽  
Printing Technology ◽  
Specific Strength ◽  
Properties Of Materials ◽  
Membrane Type

The work shows the possibility of manufacturing products for rocket and space technology using the additive FDM-printing technology. The object of research is the nozzle plugs of the "membrane" type. Taking into account the specific-strength properties of the product during its operation during operation, as well as the features of the FDM-process, the design was optimized, the regularities of the formation of its properties were established. An impregnation technology has been developed to seal the product. The equipment was designed and pneumatic tests were carried out. The properties of materials were investigated taking into account their guaranteed shelf life for 12 years of operation under accelerated climatic tests. It is shown that the production of products by FDM-printing methods is promising and expedient, since the properties being formed are predictable, achievable and stable.

scholarly journals Effect of Cinnamon Extraction Oil (CEO) for Algae Biofilm Shelf-Life Prolongation

Polymers ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 4 ◽  
Author(s):  
Maizatulnisa Othman ◽  
Haziq Rashid ◽  
Nur Jamal ◽  
Sharifah Shaharuddin ◽  
Sarina Sulaiman ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Shelf Life ◽  
Moisture Absorption ◽  
Morphological Structure ◽  
Strength Properties ◽  
Casting Technique ◽  
Swelling Rate ◽  
Solution Casting Technique ◽  
Algae Biofilm ◽  
Life Prolongation

This study was conducted to improve the life-span of the biofilm produced from algae by evaluating the decomposition rate with the effect of cinnamon extraction oil (CEO). The biofilm was fabricated using the solution casting technique. The soil burying analysis demonstrated low moisture absorption of the biofilm, thus decelerating the degradation due to low swelling rate and micro-organism activity, prolonging the shelf-life of the biofilm. Hence, the addition of CEO also affects the strength properties of the biofilm. The maximum tensile strength was achieved with the addition of 5% CEO, which indicated a good intermolecular interaction between the biopolymer (algae) and cinnamon molecules. The tensile strength, which was measured at 4.80 MPa, correlated with the morphological structure. The latter was performed using SEM, where the surface showed the absence of a separating phase between the biofilm and cinnamon blend. This was evidenced by FTIR analysis, which confirmed the occurrence of no chemical reaction between the biofilm and CEO during processing. The prolongation shelf-life rate of biofilm with good tensile properties are achievable with the addition of 5% of CEO.

Mechanical behavior of laminated bamboo lumber dowel-type connection

2019 ◽  
Vol 23 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Jiannan Li ◽  
Aiping Zhou
Keyword(s):  
Rectangular Cross Section ◽  
High Strength ◽  
Strength Properties ◽  
Loading Capacity ◽  
Yield Model ◽  
Specific Strength ◽  
High Specific Strength ◽  
Laminated Bamboo ◽  
Theoretical Results ◽  
Laminated Bamboo Lumber

Bamboo is a kind of green material with high specific strength, while the hollow tubular structure makes it rather hard to be utilized in structure. Glue and hot-pressing processes make laminated bamboo lumber rectangular cross section and with high strength properties. The dowel-type connection can be used in I-joist instead of the costly adhesive, while the behaviors of which are extremely complicated. European yield model is confirmed to be an effective method to estimate loading capacity of connection and is adopted by various standard and design codes. This article focused on a kind of connection innovatively with laminated bamboo lumber dowel. The embedment tests were carried out to study the embedment strength of laminated bamboo lumber members. Connection tests under lateral load were conducted to investigate the performance and loading capacity. Finally, theoretical results determined by design rules in current codes were compared with experimental results

On the Flow and Creep Strength of Power Law Materials Containing Rigid Reinforcements

1990 ◽  
Vol 194 ◽  
Author(s):  
Ming Y. He
Keyword(s):  
Power Law ◽  
Creep Strength ◽  
Ceramic Materials ◽  
Al Alloys ◽  
Metallic Materials ◽  
Flow Properties ◽  
Flow Strength ◽  
Specific Strength ◽  
High Specific Strength ◽  
Properties Of Materials

AbstractInvestigation of the flow properties of materials containing rigid reinforcements has been prompted by various technological challenges concerned with high specific strength composites. The materials of interest range from metallic materials such as Al alloys, to ceramic materials such as Si3N4 and also include the intermetallics: TiAl and MoSi2. The reinforcements are typically A12O3 and SiC. The strengths of interest may be the flow strength at ambient temperature or the creep strength. The present analysis constitutes an attempt to provide estimates of either the flow or creep strength for matrices that exhibit power law deformation.

Nanostructured SPD Processed Titanium for Medical Implants

2008 ◽  
Vol 584-586 ◽  
pp. 49-54 ◽  
Author(s):  
Ruslan Valiev ◽  
Irina P. Semenova ◽  
Enja Jakushina ◽  
V.V. Latysh ◽  
Henry J. Rack ◽  
...  
Keyword(s):  
Dental Implant ◽  
Pure Titanium ◽  
Strength Properties ◽  
Early Postoperative Period ◽  
Special Technique ◽  
Commercially Pure Titanium ◽  
Medical Implants ◽  
Specific Strength ◽  
Early Loading ◽  
Fatigue Characteristics

Nanostructured titanium (nTi) with essential enhanced strength and fatigue characteristics is an advanced material for dental implant applications. Nano Ti is commercially pure titanium, that was nanostructured by a special technique of severe plastic deformation. It is bio inert, does not contain even potentially toxic or allergenetic additives and has significantly higher specific strength properties than any other titanium applied in dental implants. Cylindrical threaded screw implants Nanoimplant® sized 2.4 mm in diameter and 12 mm in length were made from nTi. It is the first application of nTi dental implant in the world reported. Recently more than 250 successful clinical applications dealing with surgery on the front teeth were carried out. No complications were noticed during the early postoperative period and early loading. Laboratory cytocompatibility tests undertaken so far on mice fibroblast cells have indicated that nanocrystalline Ti surface has a significantly better property for cell colonisation and healing of tissue consequently.

scholarly journals Testing of mechanical properties of materials used in FDM technology

Mechanik ◽  
2019 ◽  
Vol 92 (4) ◽  
pp. 285-287 ◽  
Author(s):  
Marcin Snopczyński ◽  
Jarosław Kotliński ◽  
Ireneusz Musiałek
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
3D Printing ◽  
Strength Parameters ◽  
Full Data ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Mechanical Properties Of Materials ◽  
Properties Of Materials ◽  
Materials Used

With the development of 3D printing technology, there is a development in the use of new printing materials. In practice, it often happens that the constructor does not have full data about the material that he wants to use. The article presents the results of tests of tensile strength of samples printed using the FDM method. 3D printing using the FDM method is widespread, however, the properties of the materials used in this method are still not fully understood. The aim of the research was to obtain information on strength parameters that form the basis for further analyzes.

Features of testing composition materials on shear at high temperatures

2020 ◽  
pp. 180-186
Author(s):  
К.В. Шаньгин
Keyword(s):  
High Temperatures ◽  
Shear Test ◽  
Measurement Accuracy ◽  
Physical And Mechanical Properties ◽  
Carbon Composite ◽  
Space Technology ◽  
Composition Materials ◽  
Carbon Composite Materials ◽  
Properties Of Materials ◽  
Materials Used

Рассмотрены проблемы, возникающие при испытании на сдвиг при высоких температурах, объемно - армированных углерод - углеродных композиционных материалов, применяемых при создании ракетно-космической техники. Предложены варианты повышения точности измерения, достоверности определяемых физико-механических свойств материалов. Problems arising during shear test at high temperatures of volume - reinforced carbon - carbon composite materials used in creation of rocket and space technology are considered. Disclosed are versions of improving measurement accuracy and reliability of determined physical and mechanical properties of materials.

Effect of technological modes of stampings on strength properties of rocket and space equipment parts

2021 ◽  
pp. 281-287
Author(s):  
V.S. Muratov ◽  
M.S. Kazakov
Keyword(s):  
Heat Treatment ◽  
Tensile Tests ◽  
Strength Properties ◽  
Space Technology ◽  
Deformation Processing ◽  
Premature Failure ◽  
Locking Mechanism ◽  
Steel Bars ◽  
Processing Modes ◽  
Highly Loaded

The reasons for premature failure during vibratory tests and tensile tests of highly loaded parts of the locking mechanism made by stamping from AISI 5140 steel bars and used in rocket and space technology are studied. It is determined that destruction is caused by the microlaminations in metal formed during heat treatment. Recommendations for adjusting of the deformation processing modes of forgings, ensuring the exclusion of premature destruction cases, are developed.

scholarly journals Isolation of cellulose microfibrils - An enzymatic approach

BioResources ◽  
2006 ◽  
Vol 1 (2) ◽  
pp. 176-188 ◽  
Author(s):  
Sreekumar Janardhnan ◽  
Mohini M. Sain
Keyword(s):  
Large Scale ◽  
Energy Requirement ◽  
High Energy ◽  
Strength Properties ◽  
Environmental Benefits ◽  
Dutch Elm Disease ◽  
Cellulose Microfibrils ◽  
Significant Shift ◽  
High Shear ◽  
Specific Strength

Isolation methods and applications of cellulose microfibrils are expanding rapidly due to environmental benefits and specific strength properties, especially in bio-composite science. In this research, we have success-fully developed and explored a novel bio-pretreatment for wood fibre that can substantially improve the microfibril yield, in comparison to current techniques used to isolate cellulose microfibrils. Microfibrils currently are isolated in the laboratory through a combination of high shear refining and cryocrushing. A high energy requirement of these procedures is hampering momentum in the direction of microfibril isolation on a sufficiently large scale to suit potential applications. Any attempt to loosen up the microfibrils by either complete or partial destruction of the hydrogen bonds before the mechanical process would be a step forward in the quest for economical isolation of cellulose microfibrils. Bleached kraft pulp was treated with OS1, a fungus isolated from Dutch Elm trees infected with Dutch elm disease, under different treatment conditions. The percentage yield of cellulose microfibrils, based on their diameter, showed a significant shift towards a lower diameter range after the high shear refining, compared to the yield of cellulose microfibrils from untreated fibres. The overall yield of cellulose microfibrils from the treated fibres did not show any sizeable decrease.

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