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Online since: September 2011
Authors: Zhen Bao Li, Jing Zhang, Hong Yu Zhou, Er Wei Guo
As for various mechanical properties of bending components, the size effect of concrete material is reflected in the mechanical properties of reinforced concrete structures.
So various mechanical properties exist size effect, especially those are decided by concrete material performance.
In addition, the bond between steel and concrete is affected by many factors, such as space, diameter, appearance, position, strength of concrete and protection layer thickness etc.
But those factors will be changed with the specimen size changing.
That is, the mechanical properties of reinforced concrete structure are affected by the size affect not only of concrete materials but also of components.
Online since: January 2012
Authors: Hiroshi Numakura, Naoki Yoshinaga, Kohsaku Ushioda, K. Honda, K. Nakano, T. Yokoi, D. Maeda
Quantitative Analysis of Carbon in Ferrite in Dual-phase Steels by Mechanical Loss Measurements K.
An additional factor is the amount of carbon in solid-solution in a phase, which influences the yield strength and, more importantly, strain-ageing behaviour.
Mechanical Loss.
Because the two values turned out to agree with each other within experimental error in every case, the unexpected differences in the peak positions may not seriously affect the evaluation of the relaxation strength.
Honeycombe, Steels – Microstructure and Properties, Third ed., Butterworth-Heinemann, Oxford, 2006, Chapter 10
Online since: November 2010
Authors: Ji Long Xie, Su Xia Zhou, Jun Qing Zhang, Yue Yang
This can give the basis for the thermal fatigue properties study of the particle reinforced composite SiCp/A356 used in high-speed train brake disc.
The particle reinforced composite material SiCp/A356 is used in high-speed train brake disc because of its high strength, wear and thermal resistance, but its fatigue property need to study.
The research methods of thermal fatigue properties are as follows [4]: strain range-thermal fatigue life, strain range partitioning method, equivalent temperature method, temperature amplitude- the number of thermal cycle method and average/maximum temperature-thermal cycles law. because of the complexity of thermal fatigue test, people try to use the high temperature mechanical fatigue test to replace thermal fatigue one [5-7]. while the constant high temperature mechanical fatigue does not reflect the range of temperature and strain, it is not reasonable enough to use.
Thermal fatigue performance of composite SiCp/A356 The forecast model of low cycle fatigue life(Nf) taking into account the average stress, , is as follows: (1) Where is the fatigue strength factor, the fatigue strength index, the fatigue ductility factor, the fatigue ductility index, the elastic modulus.
Fig.4 Contrast between thermal fatigue stain life plot and high temperature ones We can find that from the above analysis the temperature and strain range are important parameters which can affect thermal fatigue performances.
Online since: October 2018
Authors: Dmitrii N. Gurulev, Lyubov' V. Palatkina
There is a subtle change of body shape (warping), which depends on its properties, the type of deformation and its nature in the flow of time.
In this regard, the consideration of this factor is necessary in the manufacture of various parts and components of LCM using the methods of metal forming (stamping, bending, calibration, etc.) [1-6].
Distribution of microhardness H and deformations in LCM after rolling with 20% compression under load: 1– initial state; 2 – 2.5 %; 3 – = 4.5 %; 4 – = 6.5% As can be seen from Fig. 4, the distribution of microhardness in CM under load is complex, due to the difference in physico-mechanical properties of metals and the influence of the prior "history" of loading of the sample.
Near the heat-affected zone, regardless of the sign of the applied load, the microhardness of aluminum at the border with AMg6 increases to 390 MPa due to the implementation of local microplastic deformations.
When the maximum de-formation up to 6.5 is realized, the hardness of titanium at a distance of more than 0.3 mm from the heat-affected zone increases up to 2470 MPa, aluminum-up to 435 MPa and the heat-affected zone AMg6 and VT1-0 up to 475 and 420 MPa, respectively.
Online since: February 2013
Authors: Li Na Ji
The extent of polymerization (apparent from the molecular weight of the polymer) is a function of the polymerization conditions and significantly affects the properties of the resin that is produced.
[Note that intrinsic viscosity (as well as molecular weight) indicates the degree of polymerization, which in turn is the main factor in setting the properties of PET.]
PET has good barrier properties against oxygen and carbon dioxide.
The mechanical properties of polyester film make it a choice substrate for a variety of processing technologies, such as vacuum metalizing, coating and laminating.
This polyester is used widely for electrical and electronic components due to its high temperature resistance and good electrical properties.
Online since: February 2022
Authors: Khaled Al-Farhany, Hyder Hasan Balla, Alaa Liaq Hashem
The results are specifically interested in mechanical properties, and few of those are interested in thermal properties such as conductivity and thermal resistance of concrete.
The crumb granule properties are summarized in Table 1.
At the inner surface of the block, again, the above-mentioned factors reduce thermal diffusion and increase thermal resistance as shown in Fig. 7.
Wang, An experimental study on mechanical and thermal insulation properties of rubberized concrete including its microstructure, J.
Que´neudec, Physico-mechanical properties and water absorption of cement composite containing shredded rubber wastes, J.
Online since: May 2021
Authors: Zulkarnain Zainal, Eydar Tey, Lim Kean Pah, Ismayadi Ismail
The effects of mechanical agitation of electrodeposition bath on Al2O3 particles dispersion and particles embedment were studied.
The Cr-Al2O3 nanocomposite samples were subjected to different tests to characterize their surface morphology, crystalline structure and mechanical properties.
The incorporation of Al2O3 particles does not affect the crystal structure of the chromium matrix.
The decreasing trend of the weight percent of alumina is due the collision factor [8].
Ger, Improve the mechanical properties and wear resistance of Cr-C thin films by adding Al2O3 particles, Surf.
Online since: March 2011
Authors: Claudio Giardini, Michela Longo, Giancarlo Maccarini, Gianluca Danilo D'Urso
The average cell size and the somehow irregular distribution of cell shape and size make the definition of average mechanical properties an hard task.
When dealing with material properties, however, it should be pointed out that foam mechanical strength is remarkably affected by cell defects.
As it was expected, no barrelling was noticed and cell breakage was the main factor affecting the material behaviour.
In such cases increasing density leads to increased mechanical properties.
Foam compressibility is achieved through either cell breakage or cell buckling; both these deformation modes are unable to raise mechanical properties.
Online since: May 2003
Authors: Michael V. Swain, Simon P. Ringer, M. Guazzato, M. Albakry
In order to improve the mechanical properties of IA, Vita has developed a new ceramic by adding 33vol% of CeO2-PSZ to the original material.
Processing of the block by the manufacturer should result in a more homogeneous material with better mechanical properties.
However, studies regarding the mechanical properties of these materials do not consistently support such assumptions, suggesting that some other factors are also important in determining the performance of IA and IZ [1-3].
Discussion IA slip and IA block are essentially two different materials because of their differing grain shape, size and orientation and are expected to have different mechanical properties and fracture behavior.
The crack is deflected by the high strength alumina grains, whereas it propagates through the transformed zirconia grains Conclusion In-Ceram Alumina slip and block have different microstructure, and therefore different mechanical properties are also expected.
Online since: March 2017
Authors: Bryan B. Pajarito, Reymark D. Maalihan
Tensile properties of films were monitored with time during heat aging in a hot air oven at 50, 70, and 90 0C.
Among the indicators of PE degradation, mechanical properties are the most sensitive to changes during heat exposure.
Mechanical properties such as tensile strength and modulus are measured before and after thermal aging at a specified time and temperature.
Films were removed from the oven after specific aging time to evaluate changes in tensile properties.
During this stage, portion of the high molecular mass chains which dictate the mechanical properties of the film decreases gradually.
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