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Online since: August 2020
Authors: Martin Benýšek, Jaroslav Procházka, Radek Štefan
In most cases, the fire model parameters (fire load, fire compartment geometry, material properties of enclosure surfaces, ventilation condi­ tions, etc.) are assumed to be deterministic, i.e. constant, without any variability.
For the thermal absorptivity of the total enclosure, we consider high quality of modern building materials with small deviations in the thermal properties.
Mechanical Analysis For the mechanical analysis of the slab panel, an iterative procedure based on the moment­curvature approach was used.
Hence, for the subsequent thermal and mechanical analysis of the slab panel, only the fire curves obtained using the Latin Hypercubes method were utilized.
It was shown that the variability of the fire model parameters strongly affects the predicted fire resistance of the analysed slab panel.
Online since: February 2007
Authors: Joo Yung Jung, Jae Boong Choi, Jong Won Lee, In Pil Kang, Gyeong Rak Choi, Sung Ho Hwang, Mark J. Schulz
Among several possible smart nanoscale materials, Carbon Nanotubes (CNT) have aroused great interest in the research community because of their remarkable mechanical, electrochemical, piezoresistive, and other physical properties.
Among several possible smart nanoscale materials, Carbon Nanotubes (CNTs) [5] have aroused great interest in the research community because of their remarkable mechanical, electrochemical, piezoresistive, and other physical properties [6-14].
The properties of CNT are important to understand for designing smart composite materials.
Non-carbon nanotubes have small piezoelectric properties.
Electrochemical properties for corrosion monitoring.
Online since: July 2010
Authors: S. M. Javaid Zaidi
The conductivity of the PEMFC membrane is one of the most critical factors in PEM fuel cell designs.
The mechanical and thermal properties were also improved as compared to unmodified Nafion® membranes.
The SPAEK had better mechanical properties than Nafion ® as shown in Fig. 4.
The mechanical properties increased with increasing SPAEK content.
This membrane had better mechanical properties and good water uptake than commercial Nafion® .
Online since: September 2018
Authors: Oluwole Daniel Makinde, Vimal Kumar Joshi, Paras Ram, Anil Kumar
In the above studies, the physical properties of the fluids were assumed to be free from temperature and depth.
However, in actual practice, these properties are significantly affected by the changes in temperature and depth taken independently or collectively.
Physical Properties of the Ferrofluids: Taiho-W40 and C1-20B.
From above results, it is concluded that geothermal viscosity is a significant factor affecting the boundary layer magnetic nanofluid flow over a uniformly heated rotating plate.
Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 230.5 (2016) 345-354
Online since: September 2013
Authors: Mahmoud Shafik, L. Makombe
Introduction Ultrasonic motors (USM) principles of operations are based on the concept of driving the rotor by a mechanical vibration force generated on the stator (PZT Transducer) via piezoelectric effect.
Mishandling of material deformation can produce a jerking effect, which can affect degree of accuracy of the USM.
Using these relations the torque factor of the motor and the diameter of the rotor including driving wheel and the shaft can be determined.
The transferred force to the shaft can be determined using the following torque factor relationship: (3) This relation shows that the torque factor has to be carefully selected during the design process of the motor.
This considered the properties of the material used to manufacture the shaft and the moment of inertia of the rotor.
Online since: September 2015
Authors: Thomas Rainer Neitzert
The advantage of the system lies in the inexpensive raw materials, but they are also responsible for the relatively weak part properties.
The scaling factor is provided by the machine manufacturer to take shrinkage of a material and the machine specific process conditions into account.
Geometry is an important factor, since wall-thicknesses affecting shrinkage rates.
Technologies, which rely on support structures, are introducing an additional geometric element and constraint, which in turn affects accuracy.
Osman, Effect of layer printing delay on the mechanical properties and dimensional accuracy of 3D printed porous prototypes in bone tissue engineering, Ceramics International, http://dx.doi.org/10.1016/j.ceramint.2015.03.004
Online since: December 2010
Authors: Sasan Yazdani, Amir Sadighzadeh Benam, Behzad Avishan
In many applications the fatigue behavior is one of the most important factors which should be considered because the most parts of machines are susceptible to fatigue fractures.
Variations of these factors affect the KIC which expresses the fatigue behavior of ADI.
Optical and Mechanical Test.
The mechanical properties of austempered specimens at two temperatures of 320 and 400°C are compared in Table 2.
Mechanical properties of austempered specimens.
Online since: February 2019
Authors: Mauro Cesar Terence, M.F.S. Gonçalves, N.C. Pereira
The Waste Polymer and Oyster Shell All plastics can be recycled, however the extent to which they are recycled depends upon both economic and logistic factors.
Various physical, mechanical and chemical properties of shells, such as cockle or blood clam, oyster, periwinkle shells, mussels, scallops, crepidula shells, and conk shells as a sand replacement, a partial and total course aggregate replacement, filler, and cement replacement, in form of complete, crushed, ground or powder had been studied [14].
Besides that, these residues have properties that allow their reuse.
However, the companies can also benefit indirectly by being involved in reverse logistics even there is no clear or immediate expected profit because of marketing, competition and strategic factors [23].
The calcium carbonate as OSW padding can reduce the cost of raw material, reduce production energy consumption, and improve preparation and mechanical properties effectively [27].
Online since: January 2016
Authors: Sergio Lorenzi, Stefano Garlati, Luigi Coppola, Patricia Kara
Acrylates, moreover, can be tailored to attain suitable rheological and mechanical behavior of concrete by modifying the PEO chain.
Materials and methods Concretes with w/c equal to 0.53, consistency class F5 (flow table higher than 580 mm - EN 12350-5) and with a cement factor of 325 kg/m3 were manufactured.
The rheological and mechanical behavior of concrete mixtures was studied at a room temperature of 20°C and at the temperature of 30°C in order to simulate hot climate condition for concrete placing.
Table 1 Physical and chemical compositions of Portland limestone cements Cement L.o.i. 500 °C SiO2 Al2O3 Fe2O3 TiO2 CaO MgO SO3 Na2O K2O Cl CE II / B - LL 32.5 R 0.96 16.59 3.89 1.73 0.12 60.01 2.42 2.67 0.13 0.62 0.02 CE II / A - LL 42.5 R 0.99 19.96 4.21 2.06 0.20 61.61 2.73 2.85 0.12 0.80 0.04 Table 2 Properties of NSF, PCE and blended superplasticizers Properties NSF PCE PNH1 PNH2 Molecular weight (MW) [g/mol] 14000 25000 3000 2000 PDI (MW/Mn) 10 2.3 1.2 1.2 Side chain length [g/mol] 1000 1000 150-1000 Monomer type Ester of acrylic or methacrylic acid Polyamine Polyamine Ionic groups/non-ionic side chains 3.6 3 3 Table 3 Blended superplasticizers Base PNH1 10% 30% 50% 70% 90% NSF 10PNH1/NSF 30PNH1/NSF 50PNH1/NSF PCE 50PNH1/PCE 70PNH1/PCE 90PNH1/PCE Base PNH2 PCE 50PNH2/PCE 70PNH2/PCE 90PNH2/PCE Experimental results and discussion Superplasticizer dosage and air entrapped.
Blended PCE/PNH superplasticizer performances, on the other hand, seem to be more affected by the cement type/class.
Online since: January 2005
Authors: Balázs Verő, Dénes Zsámbók, János Dobránszky, Ákos Horváth, László Kopasz, József Hirka
Reprint of an publication illustrating the mechanical properties of MTA50 steel and the author: professor József Verő (1904-1985).
Mechanical properties of the DE700 type steel plotted against coiling temperature.
Today the up-to-date issue of multiphase steels can be justified by many factors.
Mechanical properties (in relative quantity) of different phases for DP and TRIP steels.
And from that, mechanical properties can also be estimated if the deviations resulting from interaction between texture elements are identified.
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