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Online since: July 2014
Authors: Kirill Polozhiy, Martin Keppert
Nevertheless after a treatment such ashes can have properties relatively comparable with coal fly ashes and thus can be used as Supplementary Cementitious Material (SCM).
It can be concluded that water extracted MSWI fly ash can be used as 10 % Portland cement substitute without loss of mechanical properties.
The specimens of mortars (160x40x40 mm prisms) were stored in water for 7, 28 and 90 days and then its bending and compressive strength was measured (ČSN EN 196-1).The influence of thermal load on mechanical properties of mortars was examined by means of measurement of residual compressive and bending strength; the thermal load was realized by heating of 28 days cured samples in a laboratory oven for 4 hours at given temperature.
Another process influencing the residual properties is thermal expansion of aggregate particles; especially the quartz crystal modification transition at 573 °C is understood as an important factor reducing the strength of materials containing quartz.
Konvalinka, Basic and Hygric Properties of Concrete Containing Fine Ceramic Powder, Advanced Materials Research 897 (2014) 188-191
Online since: October 2013
Authors: Ying Ying Su, Wen Guang Liu, Peng Zhang, Yu Zhang, Jun Liu, Rui Jin, Hai Long Bao, Jia Jie Che, Kun Shan Yu, Rong Gang Han
Parasitic are one of the most important factors for press pack IGBT.
This raises a number of mechanical and electrical issues.
There are basically two important reasons: first, large voltage spikes will result due to the high di/dt and stray inductance, which can destroy the device; second, the discrepancy of parasitic parameters between paralleled chips lead to unequal current distribution, consequently affecting the performance of the whole device[1,2].
Providing the correct dimensions, material properties (resistivity of conductors and permittivity of insulators) and boundary conditions (the conductors and current paths), the software can extract the structural impedances of any arbitrary geometry.
(b) Mesh Some factors must be considered when extracting the parasitic.
Online since: June 2022
Authors: Mohamad Ramadan, Abdul Ghani Olabi, Montaser Mahmoud, Keith Pullen, Sumsun Naher, Mohammad Ali Abdelkareem
For this reason, endeavors have investigated several types of additives to enhance the thermal properties of PCM aiming to provide fast responses.
The inclusion of additional substances must be applied while preserving some crucial PCM properties such as latent heat of fusion/melting and phase change temperature (PCT).
Thermal conductivity enhancements for same (a) nanoparticles [15] and (b) phase change materials [16] The latent heat TES unit shape is one of the most crucial factors that affect the heat transfer rate and phase transition process.
It was found that the fin length and branches angle are more influential factors than the fin thickness regarding their effect on the solidification process acceleration.
Nanoparticles loading concentration/volume fraction can be considered as the most effective factor since it has a superior role in affecting the thermal characteristics of NEPCM.
Online since: November 2011
Authors: Tirumalai S. Srivatsan, Satish V. Kailas, K. Kandasamy
Srivatsan2 1Department of Mechanical Engineering Indian Institute of Science Bangalore 560 012, INDIA 2Department of Mechanical Engineering The University of Akron Akron, OHIO, 44325, USA Key Words: Friction Stir Welding, Tool Plunge, Rotation speed, Traverse speed, Aluminium Alloy 7020 Abstract The axial force during friction stir welding is sensitive to plunge depth of the tool and is one of the prime factors, which exercises control over heat generation during welding.
These are: (a) Weld Nugget (WN) or stirred zone, (b) Thermo-Mechanically Affected Zone (TMAZ), (c) Heat Affected Zone (HAZ), and (d) base metal [5–8].
The heat-affected zone (HAZ) is a thermally-affected zone without much deformation.
Kailas, Influence of Tool Geometry on Defect Formation, Microstructure and Mechanical Properties of a Friction Stir Welded Aluminium Alloy, 2nd International Conference "Advances in Production and Processing of Aluminium", Bahrain International Exhibition Centre, Kingdom of Bahrain, December-2005
Kokawa, Microstructural factors governing hardness in friction-stir welds of solid-solution-hardened Al alloys, Metallurgical and Materials Transactions A, 32 (2001) 3033–3042
Online since: January 2010
Authors: Yan Fei Chen, Yu Yong Chen, Fan Tao Kong, Shu Long Xiao
However, development of TiAl alloys has been hindered by poor room temperature toughness, poor balance of mechanical properties and manufacturing difficulties.
Major effort now being undertaken in the investment casting is to optimize the casting processes and the post-solidification heattreatment, in order to deliver high-quality casts with an acceptable combination of mechanical properties [14,15].
In addition, the utility of organic resin results in relatively large shrink which affects dimensional accuracy of castings.
In order to gain better integrate properties, it is necessary to refine the coarse cast microstructure through forging and rolling.
Many researchers focus on the MA of TiAl alloys with the process and their impact factors[31].
Online since: August 2019
Authors: Martin Kuřík, Jana Sobotová, Nikola Moravcová
Mechanical properties were evaluated by hardness tests and three-point bending strength and wear resistance by Pin-on-disk tests.
DCT affects not only mechanical properties, as evidenced by work [29], where move of the tempering curve thanks DCT was confirmed.
Effects of deep cryogenic treatment on mechanical and tribological properties of AISI D3 tool steel.
Evolution of the microstructure and mechanical properties of powder metallurgical high-speed steel S390 after heat treatment.
Evaluation of factors influencing deep cryogenic treatment that affect the properties of tool steels.
Online since: March 2014
Authors: Raphaël Guerchais, Franck Morel, Nicolas Saintier
Its chemical composition is given in table 1 and the mechanical properties are gathered in Table 2.
Table 1 : Chemical composition of AISI 316L M25W steel (wt.%) Element C Cr Ni Mo Mn Wt.% 0.02 18.96 15 3.01 1.87 Table 2 : Tensile properties of AISI 316L M25W steel Young’s modulus [GPa] Poisson ratio Yield strength 0.2% [MPa] Ultimate strength [MPa] 194 0.284 346 644 100 mm Fig. 1.
Several studies carried out by the present authors [5,6] clearly showed that these two local mechanical parameters are strongly affected by the crystal orientation within the polycrystalline aggregate.
Hence, the initiation probability on a slip system can be expressed by: PFn=Pτa≥τath=1-exp-τaτ0m. (1) The normal stress is assumed to modify the initiation conditions by affecting the scale factor.
Moreover, the distributions of these two mesoscopic mechanical quantities are affected by the anisotropic elastic behavior.
Online since: May 2014
Authors: Leila Figueiredo de Miranda, Tatiana Mayumi Moori, Mauro Cesar Terence, Nilson Casimiro Pereira, Sonia Braunstein Faldini
The PP high performance in its mechanical properties are wide due to its crystallinity, it has high tenacity, good clarity, high temperature resistance, among others.
Table 1 – Analysis of variance and significance level of the model Factors G.L.
A chemical reaction induced by radiation in the solid material affects the physical properties of the polymer in various lengths.
Phase morphology, crystallization behavior and mechanical properties of isotactic polypropylene/high density polyethylene blends.
The effect of gamma and electron beam irradiation on the thermal and mechanical properties of injection-moulded high crystallinity poly(propylene).
Online since: April 2012
Authors: Mohd Amri Lajis, Faizul Ezmat Abdul Hamid
Therefore, research is going on to develop a composite material which satisfies the basic requirement of tool properties.
EDM tool electrode can also be produced with desirable properties by the result of a combination of different materials.
Generally, a higher duty factor means increased machining efficiency.
The selection of tool electrode material is so important by mean to obtain high expectation of desirable properties of tool electrode.
[6] J.Marafona, Black layer affects the thermal conductivity of the surface of copper tungsten Electrode, Int J Adv Manuf Technol. 42 (2009) 482-488
Online since: August 2025
Authors: I. U. Ferdous, Juliawati Alias, Norhaida Ab. Razak, Nasrul Azuan Alang
This study aims to develop a cost-effective SPC test rig integrated with an existing UCT machine and investigate its reliability in predicting the creep properties.
Numerous researchers have developed correlations and models to extract creep properties from SPC data.
Furthermore, finite element (FE) analyses have been employed to investigate the effects of geometric factors, material properties, and damage evolution on the SPC response [10].
Biaxial stress may result in more complex states, potentially affecting microstructural changes differently.
Zhao et al., Determination of creep properties of an advanced Fe-Cr-Ni alloy using small punch creep test with a modified creep strain model, Theor.
Showing 11621 to 11630 of 25935 items