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Analysis of the obtained data of density and compressive strength demonstrated that the aging of the alkaline solution during 24 hours before its using has a positive effect on the physical and mechanical properties of all experimental geopolymer pastes.
Garbacz, Influence of Activators on Mechanical Properties of Modified Fly Ash Based Geopolymer Mortars, Materials (Basel), 13(5) (2020) 1033 [21] Mohd Mustafa Al Bakri Abdullah, H.
Baghshahi, The effect of mixing molar ratios and sand particles on microstructure and mechanical properties of metakaolin-based geopolymers, Materials Chemistry and Physics, 240 (2020) 122223.
Yang, Mix design factors and strength prediction of metakaolin-based geopolymer, Ceram.
J. van Deventer, Understanding the relationship between geopolymer composition, microstructure and mechanical properties, Colloid.

The quasi-static compressive properties of SiCp/ZAlCu5Mn composite foams were tested by compressive test.
The research of mechanical property is the basic for the application of the structure materials[2].
As a new type of structural materials with a variety of good performance, foam aluminum’s application in industry must rely on research of its mechanical properties.
Static compression properties of foamed samples were tested with invariable strain rates on CMT5105 material test system.
Therefore, the factors, which affect the height and length of the collapse plateau region, will have effect on the energy absorption ability of foams.

Introduction Hazardous substances present in the environment are large group of pollutants affecting human health [1,13].
One of the most important factors primarily conditioning the health of workers is dust level.
The stability of the created phase morphology is highly dependent upon the addition of interfacial agent, ensuring improved dispersibility and improved adhesion at the interface, thus improving the physical and mechanical properties of the polymer system [1,8].
For assessing the impacts of interfacial agent on structure and properties of mixed fibers, we used fiber containing 20 % polyamide component with changing interfacial agent content (0-2 % wt.
Kovář: The effect of composition and rheological properties of component on the morphological structure of polymer blends.

Box 1026, SE-551 Jönköping Sweden a fredrik.wilberfors@scania.com, bingvar.svensson@jth.hj.se Keywords: Grey cast iron, Mechanical properties, Nitrogen, Inoculant, Ludwigson, Hollomon Abstract.
The main purpose with this paper is to show the effect of nitrogen and inoculation on the tensile properties and microstructure of cast iron with lamellar graphite.
In this report, the influence on the tensile properties from additions of nitrogen and inoculant is investigated.
The aim was to vary the nitrogen content and inoculant addition in order to achieve materials with differences in microstructure and mechanical properties.
The experiment was conducted as a three level full factor trial with a repeated midpoint.

Plastic materials have high stability and excellent physical and mechanical properties, which ensures their reusability.
Effective use of recovered plastics requires an understanding of their mechanical properties.
Kozlovskaya, A study of significant factors affecting the quality of water in the Oskil River (Ukraine).
Assessment of the Mechanical Properties of Pet Polymer Material from Recovered Plastic Bottles.
Mechanical and Thermal Properties of Interlocking Bricks Utilizing Wasted Polyethylene Terephthalate.

However, it was difficult to specify the pore structure factor affecting the methanol transport because the PCP used in the previous experiment had a huge number of small pores with different diameters and different lengths.
In this study, we proposed a perforated metal sheet of which the pore diameter and porosity (open ratio) were regularly controlled instead of the PCP in order to determine the dominant factor affecting the MCO and power generation characteristics.
X pitch Y pitch Pore Table 1 Properties of the metal sheet used in this study.
These results suggested that the pore diameter of the metal sheet was not a dominant factor affecting the resistivity of the methanol transport, while the open ratio is a dominant factor.
It was found that the open ratio of the metal sheet was an important factor affecting the methanol crossover and power generation characteristics.

During tests, problem have been solved concerning the hemispherical punch lubrication which affected fracture position on the dome.
The complexity of the processes of plastic forming imposes a rigid and frequent characterization of the mechanical behavior and formability of sheet metal used in these processes.
The locus of the forming limit is called the forming limit curve (FLC), and the FLC is affected by many factors, such as the forming speed, the lubrication condition, the thickness of sheets, the strain hardening, and the anisotropy of the sheet metals [2].
The tensile properties in 0°, 45°and 90° directions to the rolling direction shown in Table 1 have been measured: - yield strength, ultimate tensile strength and elongation by STN EN ISO 6892-1, - normal anisotropy ratio by ISO 10112 , - strain-hardening exponent by ISO 10275.
Tab. 1 The tensile properties of TS 245 tin steel sheet, thickness 0.28 mm Direction [°] Rp0,2 [MPa] Rm [MPa] A80 [%] r [-] rm [-] ∆r [-] n [-] nm [-] ∆n [-] 0 250 370 31.1 1.171 1.330 -0.206 0.188 0.195 -0.008 45 245 358 37.8 1.433 0.199 90 254 367 36.8 1.284 0.194 The limit strains have been measured by Nakajima test - Fig. 1.

The results proved that the use of the silica nanoparticles significantly increase the strength of the hook, while affect considerably its tensile fracture behavior.
Materials The most appropriate material in terms of mechanical properties while reducing weight is the carbon fiber.
The final material selection is based on the fact that carbon fibers are brittle materials, thereby aramid fibers should be used along so to provide adequate tribological properties due to friction with the rope.
These properties were used for the loading simulation of the hook using finite element analysis (FEA).
From the experimental results it can be concluded that the epoxy resin, when reinforced with silica nanospheres, significantly improves the mechanical properties due to the uniform dispersion of nanospheres in the mixture.

The effects of diatomite particle size on the microstructure and mechanical properties of porous Si3N4 ceramics were investigated.
The particle size of starting powder is the most important factor that affected microstructures of sintered samples.
Fig. 2 SEM images of diatomite powder and porous silicon nitride ceramics obtained with different diatomite size (a) diatomite powder (b) 40µm (c) 10µm (d) 2µm (d) (b) (a) (c) Porous Si3N4 ceramics showed very excellent mechanical properties.
Summary Porous Si3N4 ceramics with high porosity and excellent mechanical properties were fabricated by the carbothermal reduction reaction between diatomite and carbon.
We investigated the influences of diatomite size on microstructure and mechanical properties.

As the temperature increases, the strength of steel is drastically reduced, which has a great influence of temperature on mechanical properties of steel structure.
Accurate description of the mechanical properties of steel under elevated temperature is generally obtained by experimental methods.
Strength reduction factor, reduction factor for modulus of elasticity and reduction factor for proportional limit were used, in the paper, to describe the mechanical properties of steel at elevated temperatures given by the Eurocode3[8].
When 200°C affected range, and as 400°C < T≤500°C, it may be termed as the heavily affected range.
The important factor was the temperature of the column as the blast load was applied on it.