Search results

The aggregate and the cement were tested according to their physical and mechanical characteristics, while the properties of the hardened concrete were evaluated according to their mechanical resistance.
Table 1- Physical and mechanical properties of cement Physical and mechanical properties Standard Result Specific weight (g/cm³) NM 23 [5] 2.96 Compressive strength 7 days (MPa) NBR 7215 [6] 15 Compressive strength 14 days (MPa) 22 Compressive strength 28 days (MPa) 28 Figure 1 – Compressive strength test of cement.
The age and history of concrete affect its characteristics and properties, which qualify the concrete.
The knowledge of the properties, possibilities, limitations and also the conditioning factors, are elements which allow the engineers to choose the appropriate material to use in their works [4].
Absorption is affected by several factors [18]: - Constituent materials: water (quantity and purity); cement (quantity, composition and fineness); aggregates (number, type, size, moisture and impurities); and additives (reactive or inert)

Local mechanical properties were determined by the microhardness and nanohardness measurements.
Ring compression testing (RCT) was employed with the aim to obtain the macroscopic mechanical properties.
The experimental results confirmed that hydrogen as well as the cooling rate substantially influenced the microstructure and affected both local and macroscopic mechanical properties.
Hence, the fraction of the β-phase and oxygen content in the phase are the most decisive factors causing the fuel cladding embrittlement.
The loss of mechanical properties should be then caused mainly by the precipitated hydrides.

Experimental Monitoring of HB Hardness and Ultimate Tensile Strength UTS of Pressure of Al-Si Castings Depending on the Increase Pressure Changes Jan Paskoa and Stefan Gasparb Faculty of manufacturing technologies TU Košice with seat in Prešov, Bayerová 1, 080 01 Prešov, Slovakia ajan.pasko@tuke.sk, bstefan.gaspar@tuke.sk Keywords: Die-casting, Mechanical properties, Increase-pressure Abstract.
Experimental observations enable to determine the dependency between the observed mechanical properties of pressure Al-Si castings and one of the basic parameters of die casting – increase pressure.
The structure as well as mechanical properties of castings are to a considerable extent affected by technological interventions in a crystallization process.
The mentioned factors are mutually influenced.
The die casting products are of very precise dimensions, smooth surface, thin walls and very good mechanical properties [1,2].

The effect of deposition temperature on microstructure and mechanical properties of ZrN coatings fabricated by DC magnetron sputtering was investigated.
Introduction Hard coatings are used to enhance the mechanical properties of materials surfaces.
Different deposition techniques and processing parameters would vary the microstructure and mechanical properties of ZrN coating [5].
The aim of this work is to investigate the procedure for ZrN coatings growth and the effect of Ts on the structure and mechanical properties of ZrN coatings.
The hardness slightly varies may be due to the difference of some factors such as preferred orientation, grain size, residual stress and consistence.

This paper focuses on the influence of the longitudinal cracks on the mechanical properties of box girder using numerical method.
Also some researches find the factors as temperature gradients, bottom continuous tendons may casuse the longitudinal cracking[4][5][6].
Generally, longitudinal cracks influence the durability of bridges prominently, and have little effect on the mechanical Properties.
This paper focuses on the influence of the longitudinal cracks on the mechanical properties of box girder using numerical method.
Numerical Study of Some Post Cracking Material Parameters Affecting Nonlinear Solutions in RC Deep Beams [J].

Nonetheless, the disadvantages of premixed ball-milled powder are degraded flowability[10] and agglomeration of reinforcements, which causes metallurgical defects in the as-fabricated composites and severely affects the stability of mechanical properties of DRTMCs.
After determining the optimal process parameter combinations of current and scanning speed for the samples, the microstructure and mechanical properties of the sample were controlled by changing the scanning strategy, and mechanical properties of the sample were tested.
Hence, the design of EB-PBF feedstock can provide a promising channel for the higher mechanical properties of DRTMCs.
(2) The relative density of as-built composites produced by EB-PBF can reach 99.9%, but there are still exist a few defects in the components, which are the mainly factor of affecting mechanical properties of EB-PBF -composites, especially fatigue properties.
(3) In order to optimize the mechanical properties of DRTMCs prepared by EB-PBF, it is necessary to develop and utilize more accurate simulation tools to predict the relationship between mechanical properties and process parameters.

The deformation of the spindle system is the main factor affecting the accuracy of ultra-high speed grinding.
Based on these two factors, the thermal-mechanical deformation of the hybrid spindle system is analyzed and calculated with the method of FEM. the This article uses simulation methods, analysis and calculation of the oil film temperature rise and the grinding force caused by deformation of the liquid and hydrostatic spindle system factors.
The material property of 40Cr and CBN is shown in Table 1.
Table. 1 The material property used in the thermal-mechanical analysis Elastic modulus/Gpa Poisson ratio Density/kg/m3 Thermal conductivity/W/(m·K) Thermal expansion coefficient/K-1 40Cr 210 0.3 7850 50.2 1.59×10-6 CBN 720 0.15 3450 130 2.52×10-6 Through the hybrid bearings, the shaft is connected to the spindle box.
Two factors are considered to make the analysis.

These microstructural features of the harmonic structure materials lead to unique mechanical properties.
These results suggest that the MM at both RT and CT have affected the powder interior and its internal processing affects the post-sintering microstructure formation and changes in mechanical properties.
The microstructural difference in MM at RT and CT significantly affects the mechanical properties and the strength of the compact of MM powder milled for 86.4 ks at CT is higher than that at RT.
Relationships between microstructure factors and MM times at room and cryogenic temperature.
Ameyama, Effects of Microstructure on Mechanical Properties of Harmonic Structure Designed Pure Ni, J.

This paper presents the review on past literature regarding factors that affects the amount of springback that occurs after the forming operation.
The effects of these factors can be used as a guide when considering further research on springback.
Springback as a function of the material properties where the greater the springback the greater yield strength.
Accordance with that, material properties are given in Table 1.
The material properties for sheets metal are listed in Table 1, which shown values of Poisson’s ratio.

They exhibit higher strength properties than the mechanical properties of Al-Mg alloys [6, 7].
Many years of research have shown that the resistance of these alloys to stress corrosion is influenced, among other factors, by heat processing, chemical composition and welding technology (welding method, type of fillers, type of joint) [1, 5, 6, 7].
The aim of this paper is to determine the mechanical properties of FSW and MIG welded joints of chosen alloys.
Typically, the heat affected zone is characterized by the lowest strength properties of whole joint.
The mechanical properties of MIG welded joints of selected aluminum alloys are the highest for the alloy 7020.