Search results

Establishment of the mechanical model is based on model experiments, some simplified and assumptions[[] Dj.M.
Gupta Noyes Publications/William Andrew Publising, Norwich, NY (2004), in press. ] Nonlinear analysis of arch plate 2.1 nonlinear factors In structured analysis, two nonlinear problems has been found: material nonlinear problem and geometry nonlinear problem, or both.
In reinforced concrete structure, concrete is nonlinear, deformation of elastic-plastic pressure , the cracking of concrete in the tension zone, yield and strengthening of reinforced, Relative slipping between steel and concrete, concrete's shrinkage and creep properties are the material nonlinear performance[3].
Geometry nonlinear problems occurred in the case that the size of the displacement affected structural response, only need to add NLGEOM parameters in STEP option, but the general static nonlinear analysis doesn't need to choose NLGEOM parameters, so as to avoid the omissions calculation[3].

Despite its excellent durability under high temperatures, severe thermal and mechanical stresses, and oxidizing environments, CMSX-4 can still exhibit certain vulnerabilities.
These voids can serve as preferential sites for crack initiation and contribute to the degradation of mechanical properties, including fatigue and creep strength.
The change in the number of potential nucleation sites from sn = 30 to sn = 45 does not affect the morphological characteristics.
These factors lead to a decrease in the number of voids and increase in their size.
Yun, "Development of microstructure and mechanical properties of a Ni-base single-crystal superalloy by hot-isostatic pressing," Journal of materials engineering and performance, vol. 12, pp. 420-425, 2003

The performed experiment focused on the possibility of using CEM II and CEM III cements and their comparison with CEM I cement not only in terms of the physical–mechanical parameters of concrete but also in terms of the stability of concrete mixtures made from these cements.
This will significantly affect the approach to the design of concrete mixtures.
Today, the technologist, thanks to the proper dosing of admixtures to Portland cement, can respond appropriately to the project requirements, climatic conditions, method of transporting the mixture and other factors.
Fig. 2: Equipment and course of water separation test from concrete by pressure test From the point of view of the mechanical parameters of produced concrete mixtures, the development of compressive strength at 7, 28 and 60 days of age was observed.
Methods of testing cement - Part 6: Determination of fineness, 2019 [10] TAZKY, M.; HELA, R., Development of structural concrete with fly ash - mixing of different particle-size fractions of fly ash and cement, Fly ash - properties, analysis and performance, ISBN 9781536105162, Nova Publisher, Inc., New York, USA, 2017 [11] EN 12350-2.

Taking into account the set of physical and chemical properties of the given range of materials, tungsten most fully meets the requirements for high-temperature application in growing oxides and nitrides of certain metals with a melting point above 1800 oC.
A more significant factor than density, which affects the stability of the crucible, is the structural factor.
The stability of the geometric shape of single-crystal parts is associated with a more perfect structure, high purity, and density, affecting the thermal field's stability and the temperature gradient at the melt crystallization front.
One of the determining factors for obtaining high-quality single crystals that do not have gross deviations from the given geometric shape is the invariance of the geometry of the liquid metal bath during the growing process.
A pronounced difference in microhardness in different planes indicates the anisotropy of properties inherent in a single-crystal structure.

The difficulty of these constructive components lies in the fact that, the ceramic components must be attached to metal components will join vacuum chambers that make up the ring, and then must present excellent mechanical and vacuum tight.
The objective of this paper is to describe the process of film deposition and brazing of copper and the excellent results obtained in the production, mechanical characterization, microstructural and tightness.
Despite the high reliability and beam stability, the current source has several limiting factors that prevent its use in a large number of applications of extreme importance for future developments in science and technology.
This phenomenon did not affect the adhesion of the second layer electrodeposited.
Bagnato: Effect of Heat Treatment on Microstructure and Mechanical Property of Diamonds Substrates Brazed with Active Filler Metal.

Due to the unique size and different physical, chemical, thermal and mechanical properties magnetic nanoparticles are widely used as agents for drug delivery to target tissues, tissue repair, cell labelling, magnetic resonance imaging, and tumor hyperthermia [2].
This is a quantum mechanical exchange interaction.
Surface Effects The magnetic properties will change when the bulk size material is reduced to nanometer scale.
The temperature probe used should have a high degree of precision, accuracy and almost instantaneous response without affecting the medium whose temperature is being measured.
Koch, “Magnetic Nanoparticles: Properties and Potential Applications”, Pure Appl.

Mechanical output of the SAW motor was 270 times larger that of the weight and 500 W/kg in power.
The conversion efficiency from the traveling wave power to the motor mechanical output was 14 %.
From investigations based on experiments, it was found that slider surface texture affects motor performances such as speed and thrust [3]-[5].
Theoretically, however, the effect of the physical property of a slider-textured surface on motor performance has not been investigated sufficiently [10].
Hence, the effective factor [12] of projection contact was investigated and then fixed to be 0.6 in this paper.

In sewerage systems, corrosion damage of concrete gravity collectors is characterized by a high speed and scale of the process, and only the vault part is affected, causing up to 70 % of accidents at these facilities [1–3].
The susceptibility of concrete, a porous building material, to microbiological corrosion is explained by its chemical composition, structure and mechanical properties [4, 11].
These organic compounds can affect the polymer coatings of concrete, making them permeable to sulfuric acid and completely ineffective in protecting concrete from biogenic sulfuric acid aggression. 5.
Mykhailova, Hydrogen Sulphide in Industrial Enterprises Water Management Infrastructure - The Factor of Chemical and Microbiological Corrosion Concrete Degradation of Water Facilities.
Dietzel, Advances in concrete materials for sewer systems affected by microbial induced concrete corrosion: A review.

The mechanism of AFM has numerous influence factors and machining parameters.
In mechanical engineering field, the steady drag force is the key component of force loading on the particle.
The restrained module can limit the dimensions of the passage, and consequently affected the environment parameters of the flow field (Pressure, flow rate, turbulence intensity etc.).
In 1933 Nikuradse derived from the formulas for near-wall laminar sublayer height that the linear loss coefficient is a function of Reynolds number Re and the relative roughness factor [5].
This property is evidently a significant factor in the development of machining efficiency and quality.

Joints with poor transmission accuracy or failing elements significantly affect the robot’s performance, regardless of the control system quality.
In order to achieve low transmission error as mechanical performance of a robot joint, the influence of worn PEEK against 7075 aluminium alloy was studied.
Due to its excellent friction and wear properties, high impact durability, high corrosion resistance, low specific gravity and high melting temperature of 340˚C, PEEK composite is superior to other polymers.
Haraguchi: Development of output coupling mechanisms using the harmonic drive, Proc. vol.2, 2004IEEE/RSJ (2004)pp 1275 - 1280 [4] Y.Kiyosawa: Introduction of Ultra Flat Strain Wave Gearing,JSME,No04-17,pp76-79 (2004) [5] M.Hashimoto, I.Godler: Built-in High Accuracy Torque Sending For Harmonic Drive Gears, JRSJ, vol15-5, pp802-806(1997) [6] S.Yanabe: Torsional stiffness of Harmonic Drive Reducers, JSME,vol55-509,pp216-221 (1989) [7] T.Oguri: Backlash compensation of reduction gears by twin moter cooperative control 602 JSME 145-146(2006) [8] K.Nagamura,T.Koumori: Driving Performance of High Reduction Planetary Gear Drive with Arc Tooth Profile and Pin, 123 JSME 103-106 No.07-15(2007) [9] K.Gotouda: Experimental Analysis about the Influence of Alignment Error on Transmission Error of Planetary Gears; JSME vol4,37-38(2008) [10] N.Ito,H.Hasegawa: Robust Optimization of the Gait for a Biped Robot on External Factors, JSME,No08-35 (2008) ,47-52 [11] C.Sabourin,O.Bruneau: Robustness
Lu: Effects of steel counterface roughness and temperature on friction and wear of PE(E)K-composites under dry sliding conditions, Wear,148 (1991), pp. 235–247 [21] J.V.Voort, S.Bahadur: The growth and bonding of transfer film and the role of CuS and PTFE in the tribological behavior of PEEK, Wear 181-183(1995) pp212-221 [22] S.Bahadur: The development of transfer layers and their role in polymer tribology,Wear 245(2000)92-99 [23]G.Zhang, Z.Rasheva, A.K.Schlarb: Friction and wear variations of short carbon fiber (SCF) /PTFE/graphite (10 vol.%) filled PEEK: Effects of fiber orientation and nominal contact pressure, Wear 268 (2010) 893–899 [24] J.Bijwe, S.Sen, A.Ghosh: Influence of PTFE content in PEEK-PTFE blends on mechanical properties and tribo-performance in various wear modes, Wear 258(2005)pp1536-1542