Method of Testing the Mechanical Properties of Vulcanizates Prepared from Latex as a Starting Material

1948 ◽  
Vol 21 (1) ◽  
pp. 168-179
Author(s):  
Marcel Pirot
Keyword(s):  
Mechanical Properties ◽  
Starting Material ◽  
Daily Production ◽  
Selection Of

Abstract With the method which has been described, it is possible to obtain reproducible results easily. It is hoped that the method will make it easier to study the properties of rubber mixtures prepared from latex. Furthermore the quantity of a latex mixture needed for such a test is small, i.e., of the order of 400 cc., so the method is particularly well adapted to the selection of Hevea trees on a basis of the quality of their latex. As a matter of fact, it will be easy in many cases to follow the collection of latex from a limited number of trees. It should even be possible, by using a single dipping form and reducing the size of the dipping tank, to follow the quality of the latex from the daily production of one tree, a procedure which is impossible with coagulated rubber.

scholarly journals Mechanical Properties of GFR & Graphite Epoxy Polymer Composites

2020 ◽  
Vol 5 (6) ◽  
pp. 560-565
Author(s):  
A. Aakash ◽  
S. Selvaraj
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Composite Materials ◽  
Polymer Composite ◽  
Epoxy Polymer ◽  
Significant Degree ◽  
Polymer Composite Material ◽  
Water Ingestion ◽  
Selection Of

Composite materials have the great potential and widely used as building material in numerous applications. Polymer composite material obtains the necessary properties in a controlled significant degree by the selection of strands and lattice. The properties of the materials have been selected by choosing the correct proportion of matrix and reinforcements. To build the quality of the material by expanding the fiber substance of the material. In this current examination, the mechanical properties of the glass fiber and graphite is strengthened with epoxy polymer composite were considered. Here the open embellishment method was received for the manufacture of the polymer composite The mechanical properties, for example, rigidity, compression quality, sway quality and water ingestion test was resolved according to the ASTM norms. The mechanical properties were improved as the filaments support content expanded in the grid material.

Properties of Models Produced by Direct Selective Laser Melting Technology

2014 ◽  
Vol 693 ◽  
pp. 231-236 ◽  
Author(s):  
Michal Ackermann ◽  
Jiří Šafka ◽  
Petr Zelený ◽  
Martin Lachman ◽  
Petr Keller
Keyword(s):  
Mechanical Properties ◽  
Selective Laser Melting ◽  
Tensile Tests ◽  
Laser Melting ◽  
Proof Stress ◽  
Structure Quality ◽  
Material Tests ◽  
Supporting Structures ◽  
Selection Of

The paper deals with evaluation of selected mechanical properties of tensile test specimens which were made from AlSi12 material by Direct Selective Laser Melting (DSLM) technology. Specimens were built in three various set-ups such as different angles towards building platform and various types of supporting structures in order to prove the influence of these parameters to mechanical properties of resulting product. The specimens were also subjected to material tests to reveal its inner structure, quality of a grain and chemical composition of the material. As a conclusion, the selection of the most suitable supporting structure and alignment of a model towards building platform are discussed. Mechanical parameters evaluated from tensile tests such as Young’s modulus (E), 0.2% proof stress (Re0,2) and tensile strength (Rm) are compared with values typical for the selected material AlSi12.

scholarly journals PREDICTION OF LIFESPAN OF RAILWAY BALLAST AGGREGATE ACCORDING TO MECHANICAL PROPERTIES OF IT

2017 ◽  
Vol 12 (3) ◽  
pp. 203-209 ◽  
Author(s):  
Vaidas Ramūnas ◽  
Audrius Vaitkus ◽  
Alfredas Laurinavičius ◽  
Donatas Čygas ◽  
Aurimas Šiukščius
Keyword(s):  
Mechanical Properties ◽  
Los Angeles ◽  
Static Loading ◽  
Main Criterion ◽  
Railway Ballast ◽  
Los Angeles Abrasion ◽  
Structure Assessment ◽  
The Relationship ◽  
Selection Of

As the railway lifespan is the main criterion for selection of the aggregate for ballast and for planning the maintenance of the railroad, it is important to define the relationship between the particle load resistant characteristics and a lifetime of ballast in structure. Assessment of the quality of the ballast aggregate particles under dynamic and static loading reflect both, the toughness and hardness, and these are identified with the Los Angeles Abrasion and Micro-Deval Abrasion values. The model formerly developed by Canadian Pacific Railroads was adapted to predict possible loads expressed in cumulated tonnes. Different ballast aggregate mixtures were tested in the laboratory including dolomite and granite. Calculated potential gross tonnage (expressed in Million Gross Tonnes) of the railway per lifetime for each different aggregate type presented. The outcome of this research is established classification system of railway ballast aggregate and defined Los Angeles Abrasion and Micro-Deval Abrasion values of aggregate dependently on required lifetime.

scholarly journals Selection and Application of Materials in Chemical Machinery Design

2020 ◽  
Vol 213 ◽  
pp. 03005
Author(s):  
Ziyi Xiao ◽  
Zhongfa Du ◽  
Zhejun Huang ◽  
Anyang Tang
Keyword(s):  
Mechanical Properties ◽  
Chemical Production ◽  
Chemical Machinery ◽  
Special Value ◽  
Main Basis ◽  
Materials Used ◽  
Quality Of Products ◽  
Selection Of ◽  
Machinery Design

Materials used in the design of chemical machinery are an indispensable part of industrial production, and chemical machinery materials are also the main basis of chemical production.Chemical mechanical properties can directly determine the quality of products in chemical production, and their materials also determine the quality of chemical mechanical properties. Selecting corresponding materials has become the core of chemical mechanical design.Therefore, in the design of chemical machinery, there is a special value for the selection of materials used in manufacturing.

scholarly journals Effect of SLM Process Parameters on the Quality of Al Alloy Parts; Part II: Microstructure and Mechanical Properties

2018 ◽  
Author(s):  
Ahmed H. Maamoun ◽  
Yi F. Xue ◽  
Mohamed A. Elbestawi ◽  
Stephen C. Veldhuis
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
High Strength ◽  
Al Alloy ◽  
Microstructure And Mechanical Properties ◽  
Wide Range ◽  
Powder Characteristics ◽  
High Strength Aluminum Alloys ◽  
Selection Of

Additive manufacturing (AM) provides customization of the microstructure and mechanical properties of components. Selective laser melting (SLM) is the commonly used technique for processing high strength Aluminum alloys. Selection of SLM process parameters could control the microstructure of fabricated parts and their mechanical properties. However, process parameter limits and defects inside the as-built parts present obstacles to customized part production. This study is the second part of a comprehensive work that investigates the influence of SLM process parameters on the quality of as-built Al6061 and AlSi10Mg parts. The microstructure of both materials was characterized for different parts processed over a wide range of SLM process parameters. The optimized SLM parameters were investigated to eliminate the internal microstructure defects. Mechanical properties of the parts were illustrated by regression models generated with design of experiment (DOE) analysis. The results reported in this study were compared to previous studies, illustrating how the process parameters and powder characteristics could affect the quality of produced parts.

The Use of Organoleptic Investigations to Evaluate the Quality of Materials in Contact with Drinking Water

1992 ◽  
Vol 25 (2) ◽  
pp. 41-48 ◽  
Author(s):  
S. Rigal
Keyword(s):  
Mechanical Properties ◽  
Drinking Water ◽  
Chemical Analysis ◽  
Organic Materials ◽  
Ease Of Use ◽  
Organic Micropollutants ◽  
Quality Of Water ◽  
And Storage ◽  
Selection Of

From about 1960, numerous organic materials for the transport and storage of water appeared on the market. The reasons for this were their interesting mechanical properties, and their ease of use. Nevertheless, some organic materials may cause alteration of the quality of water in contact with them, due to an inadequate inertness. In France a protocol to allow a selection of these materials was drawn up, giving primary importance to the organoleptic test. This test is the first step of control which the product must satisfy. The Centre de Recherche et de Contrôle des Eaux de Paris, who drew up these requirements tests, has at its disposal a great deal of results concerning organoleptic behaviour of all types of materials. This inertness test is followed up by global chemical analysis, a study of cytotoxicity, and the research for mineral and organic micropollutants leached into the water by the material. The controlled material must meet the requirements for the whole test.

Comparative Enhancement of Mild Steel Weld Mechanical Properties for Better Performance Using COPRAS–ARAS Method

2021 ◽  
Vol 6 (2) ◽  
pp. 70-74
Author(s):  
S. Nweze ◽  
J. Achebo
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Optimum Process ◽  
Bead Width ◽  
Relative Significance ◽  
Optimum Selection ◽  
Bead Height ◽  
Copras Method ◽  
Selection Of

Some machine part failures have often occurred in areas of components where the strength was lowest, especially at its weld region. Presence of voids in weldments or weld joints greatly reduces the quality of the weldment. To prevent these defects, a proper optimum selection of process parameters is highly encouraged to achieve an acceptable weld mechanical property. The Complex Proportional Assessment (COPRAS) method was applied to determine the relative significance of each alternative and the quantitative utility for each alternative. The Addition Ratio Assessment (ARAS) method was applied to optimize these parameters by utilizing the weights generated using COPRAS method. In this study, the COPRAS-ARAS method which is a multi-criteria decision making tools was applied to determine the optimum process parameters to improve the mechanical properties of the weldment. From applying these methods, it was found that weldments 7, possess the optimum input process parameters. The corresponding mechanical properties of ultimate tensile strength (UTS) of 395MPa, absorbed impact strength (CVN) of 250J, Bead height (BH) of 1.98mm and Bead width (BW) of 4.82mm was found to possess the best mechanical properties.

Relationships between mechanical properties of oak timber (Quercus robur L.)

Holzforschung ◽  
2011 ◽  
Vol 65 (5) ◽  
Author(s):  
Guillermo Riesco Muñoz ◽  
Andrés Remacha Gete
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Prediction Models ◽  
Mechanical Tests ◽  
Clear Wood ◽  
Oak Trees ◽  
Impact Bending ◽  
Strength And Stiffness ◽  
Selection Of

Abstract Ring-porous hardwoods such as oak are in high demand for furniture-making, cooperage, flooring, and construction. However, evaluating the quality of such timber is difficult and time consuming, and simpler tests are required. Models for predicting as many mechanical properties as possible, based on easier-to-determine mechanical tests, may help. In this study, the hardness, modulus of elasticity, bending, compression, and impact bending strength parallel to grain were tested on defect-free laths obtained from a sample of 42 oak trees. The relationships between the variables were investigated. Three models that relate the resistance to axial compression with bending strength and stiffness (R2>0.55; P<0.01) are proposed for defect-free oak timber. Selection of models mainly depended on the bias, which was highly variable among the models tested. The prediction models proposed in the international standard EN 384:2004 for structural dimension timber are not suitable for small clear wood specimens, especially in very elastic woods. The relative independence of hardness and impact bending strength as regards the other mechanical properties is also demonstrated.

scholarly journals Geometric Accuracy and Mechanical Behavior of Polymer-Based Composite Curved Tubes produced by Fused Filament Fabrication (FFF)

2021 ◽  
Author(s):  
Asma Boumedine ◽  
Khaled Benfriha ◽  
Mohammad Ahmadifar ◽  
Samir Lecheb ◽  
Mohammadali SHIRINBAYAN ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Fibers ◽  
Dimensional Accuracy ◽  
Processing Parameters ◽  
Geometric Accuracy ◽  
Fused Filament Fabrication ◽  
Dimensional Precision ◽  
Geometrical Quality ◽  
Selection Of

Abstract The present study aims to assess and characterize the effect of processing parameters including infill pattern and reinforcement type on the dimensional accuracy of products manufactured by Fused Filament Fabrication (FFF) process as well as on the mechanical properties of the printed components. The reinforcements used were carbon, Kevlar and glass fibers supplied by MarkForged®; they were utilized to manufacture the PA6 matrix composite. The mechanical properties of the stated composites were compared. Finally, the results obtained confirmed that the selection of the appropriate type of the reinforcements and infill patterns among the several available types during the printing process is effective in improving the mechanical properties and also in providing a better geometrical quality of the surfaces and the consequent dimensional precision improvement of the parts printed by FFF process.

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