Search results

The latter represents an attractive and practical solution but a conspicuous number of uncertainties affect the identification of the struts.
Description of the building and modelling assumptions Building features and adopted mechanical properties.
The same reduction factor was applied to the determination of the strength of the struts in presence of openings.
According to [13] the actual shear VC on the generic column can be expressed instant by instant as function of the axial load (FS) acting on the adjacent infill-equivalent strut as: (7) where the coefficient aCSE, called shear distribution coefficient for the base cross-section of a column, has the following expressions, depending on the aspect ratio of the panel: ; (8) The parameter y appearing in Eq. (8) (whose definition can be found in [13]), identifies each specific infill-frame system accounting simultaneously for the geometrical and mechanical relative properties.
Mollaioli, Strength and Stiffness Reduction Factors for Infilled Frames with Openings, Earthquake Engineering and Engineering Vibrations 13-3 (2014) 437–54

Moreover, friction and wear are largely affected by the nature and properties of these films.
The disc was utilized as-received condition, while the samples were polished using 240, 600 and 1200-grit silicon carbide papers to achieve the final properties and surface finish (Table2).
The decrease of friction coefficient of brass with the increase of sliding speed maybe that’s because to the change in the shear rate which can change the mechanical properties of materials are in contact.
[15] Ma, X.P., Wang, L.J., Liu, C.M., Subramanian, S.V, Microstructure and properties of 13Cr5Ni1Mo0.025Nb0.09V0.06 N super martensitic stainless steel.
[17] Li, C.X., Bell, T, Corrosion properties of plasma nitrided AISI 410 martensitic stainless steel in 3.5 % NaCl and 1 % HCl aqueous solutions.

For nonlinear materials their properties in terms of the plastic and viscous behavior are introduced.
The finite element model of the cracked beam was also established by integrating the stress intensity factor to obtain the element stiffness matrix [3].
In this finite element analysis considering the flexibility due to crack it was found that the resonant frequencies and the vibration amplitude are considerably affected by the existence of the crack.
On the contrary as the d/L ratio goes on increasing second and third natural frequency has been affected for different crack depth.
Barr: International Journal of the Mechanical Sciences 26 (1984), p. 639 [6] M.H.

Our proposed microstructure simulation module was useful for designing hot forming process of Ti-6Al-4V alloy Introduction Ti-6Al-4V alloy has been widely used for aerospace and power generation applications because of low density and attractive mechanical and corrosion resistant properties [1].
In order to improve the dynamic and static properties in titanium α-β type alloys, the suitable volume ratio of α and β phases should be controlled by thermo-mechanical processing parameters such as temperature, forming speed, etc.
Especially, mechanical properties of Ti-6Al-4V alloy products forged at α-β region were directly affected by the volume fraction and grain size of equiaxed primary α phase.
Generally, the friction between rolls and ring workpiece is expressed by the friction law of constant factor.
Therefore, the value of friction factor is assumed to be 0.5.

In this work, the wear of a steel mold caused by the molding of a plastic-bonded ferrite magnet has been studied with the aim of determining the main wear factors.
The polymer matrix amount for the 10% of the total weight, while the remaining 90% is made of ferrite fillers enriched with rare earths in order to further increase the magnetic properties.
The injection molding process is suitable for manufacturing magnets with high mechanical and dimensional properties at low cycle times.
(3) A qualitative model of total reaction force has been developed taking into a count the ring and the mold core mechanical properties, the initial dimensions and the final ones.
The high performances showed by this material are imputable to its elevated mechanical properties especially for its surface hardness (3000 HV) A286 steel is the material which shown the worst behavior since it presents the highest material removal rate.

It is shown that the abnormal grain growth is controlled by the three keys factors of interface energy, strain restored energy and interface mobility.
Since then, the researches about nanocrystalline materials and nano-technology have been very active because not only these kind of materials have the unique physical and mechanical properties, but also it has been believed that they will be used widely in future.
There are a few of experimental reports to indicate that addition of some abnormally grown large grains slightly reduces mechanical properties of the single-phase material [7].
A value of 0.3s time step is chosen to balance those two factors.
Temperature is one of the factors to affect the value of interface mobility but it cannot affect the local interface mobility alone during annealing.

Because of this, it is very important to know the effects of drying on the materials and their physical properties, chemical and mechanical, because these properties strongly affect the phenomena of heat transfer and mass, especially in material very sensitive to heat.
To model the drying process of solids with arbitrary shape (Figure 1), the following considerations were adopted: (a) The solid is homogeneous and isotropic; (b) The distribution of moisture and temperature inside the solid are uniform; (c) The thermo-physical properties are constant during the process; (d) The drying phenomenon occurs by heat and mass diffusion inside the solid and by heat and mass convection and evaporation at the surface thereof.
d) Themophysical and Geometrical Parameters Table 2 summarizes the thermo-physical properties of the solid and fluid, and Table 3 contain information about the geometric parameters of the solid, which were used in the simulations.
The area/volume ratio of the material is a factor of great influence in the heating process, since the higher this ratio the faster the process will happen.
Lima, Heat and mass transfer in porous solids with complex shape via lumped analysis: Modeling and simulation, Master dissertation in Mechanical Engineering, Federal University of Campina Grande.

Materials based on biodegradable polymers are exposed to external factors such as temperature, humidity, UV radiation, as well as microorganisms [4, 5].
It was found that the rate of decrease in the mass of the material depends on various biological, chemical and mechanical environmental factors.
At the same time, the availability of rubber is low for microorganisms and other environmental factors.
Popov, Effect of natural rubber in polyethylene composites on morphology, mechanical properties and biodegradability, Polymers. 12 (2) (2020) 437
Popov, Impact of UV treatment on polylactide-polyethylene film properties, IOP Conf.

The determination of electro kinetic properties and particle size of synthesized powders were made.
However, certain factors may upset the balance, with pathological formation of biogenic minerals in human tissues and organs being a possible consequence.
Results and Discussion The studies of physical and chemical properties of urinary stones are important to understand their formation.
Sample Ca P S Mg Cl Na K Zn Ca/P 1 58.19 36.43 0.79 0.52 0.07 2.99 0.46 - 1.60 2 58.01 36.68 0.78 0.73 0.14 2.85 0.32 - 1.58 3 57.04 37.13 0.63 0.63 0.29 3.12 0.38 0.28 1.54 Apatites, which comprise the mineral phase of biominerals, differ from pure hydroxyapatite in stoichiometry, composition and crystallinity, and other physical and mechanical properties.
Therefore, synthesize hydroxyapatites with different molar Ca/P ration and determination their properties can be necessary for understanding the causes and mechanisms of urolithiasis.

So under certain conditions, the metallurgical powder material have better mechanical behavior, it has a very positive implications on improving the property of machine tool joint interfaces. 3) The more the pre-tightening load is, the greater the unit area stiffness and damping are.
It is easier to exclude factors which can affect the identification accuracy of test. 2) Furthermore, after equivalent transformation, each parameter in the formula is easy to measure, so not only the difficulty of the experiment is decreased but also the result is easier to obtain. 3) Last but not least, the using the adjustable coefficient k provided a reliable guarantee for high-precision identification.
Stiffness and damping properties of the elements of a machine tool structure.Annals of the CIRP. 1979, 28: 235-239 [5] Xiao Yichuan, Research on dynamic characteristic of the assembled structure of beams considering characteristic of joint [D],Beijing University of technology,2010(in Chinese) [6] T.
Stiffness and damping properties of the elements of a machine tool structure.
Identification of Mass, Damping and Stiffness Matrices of Matrices of Mechanical Systems.