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Online since: July 2020
Authors: Su Ling Xue
It is generally believed that the mechanical properties, electrical insulation properties, heat resistance properties, chemical resistance properties, and resistance to acids, alkalis, and many chemicals of composite materials are the most important components of composite materials.
Epoxy resin has excellent mechanical properties and heat resistance It is one of the bases for manufacturing high-performance composite materials and chemical resistance [2].
These excellent properties of epoxy resin, such as mechanical properties, heat resistance and chemical resistance, are one of the important substrates for manufacturing high performance composite materials [3].
Epoxy resin has the following major properties: (1) Low viscosity and good processability.
When the reaction temperature reaches 110 °C, the change in temperature no longer affects the epoxy value.
Online since: August 2012
Authors: Bora Derin, Seval Genc
Other than magnetic particles, the base fluids, surfactants, anticorrosion additives are important factors that affect the rheological properties, stability and redispersibity of the MR fluids.
Comparison of the properties of MR, ER, and Ferrofluids [41].
Phule, Rheological Properties of Magnetorheological Fluids.
Demchuk, Additional Magnetic Dispersed Phase Improves the MR fluid Properties.
Huo and et.al, Electrorheological Properties of Chitosan Nitrate Suspensions.
Online since: September 2006
Authors: Woon Jae Jung, Ki Tae Kim, Jeong Min Kim, Joong Hwan Jun, Young-Kook Lee
Microstructures and damping properties have been investigated in Fe-23%Mn-(0~2)%Si and Fe-23%Mn-(0~2)%Co alloys, based on experimental results from metallography, X-ray diffractometry and vibration test in a flexural mode.
On the contrary, an addition of Si affects to decrease the amount and number density of ε martensite, giving rise to a decay of damping capacity.
Introduction Among various kinds of ferrous and non-ferrous high damping alloys, Fe-high Mn alloys undergoing γ(fcc)→ε(hcp) martensitic transformation have recently gained an increasing attention owing to their pronounced damping capacity and good mechanical properties [1-4].
Starting temperature of γ→ε martensitic transformation (Ms) was measured using a thermo-mechanical analyzer (TMA) with a cooling rate of 3K/min.
Fe-23%Mn 1%Si 2%Si 1%Co 2%Co 0.07 0.08 0.09 0.10 0.11 0.12 0.13 Logarithmic decrement (δ) Alloy Cooling to 298K Cooling to 288K Cooling to 77K Where, ∆δv, ∆δsf and ∆δγ/ε represent the damping properties connected to the movement of ε martensite variant boundaries, stacking faults inside ε martensite and γ/ε interfaces, respectively.
Online since: June 2021
Authors: Heng Rui Xu, Ping Liu
It is worth noting that in screen printing electronic products, the characteristics and quality of products are affected by more than 50 factors, such as printing speed, angle and shape of scraper[28].
There are many factors affecting the quality of gravure printing, such as the rheological properties of nanowire ink in the transfer process [32], the surface wettability of ink [33], etc.
Moreover, the silver nanowires were sintered by intense pulsed light (IPL)irradiation to ensure the films have high optical, electronic and mechanical properties.
Although the etching method has some advantages in the properties of the films, and the operation is simple, there are still some defects.
In the process of etching, the etching solution will penetrate into some areas that need to be retained, resulting in over etching, thus affecting the fineness of the pattern.
Online since: April 2004
Authors: Meng Kao Yeh, C.Y. Tsai
In this paper, the temperaturedependent properties of the underfill were established first.
The material properties of the solder bump are shown in Table 2 for analysis.
The material properties of underfill were measured using Instron-8848 micro test machine.
The material properties of the components in flip chip are shown in Tables 1 and 2.
(d) The change of the underfill fillet angle affects the package geometry.
Online since: May 2011
Authors: Xiu Hua Guo, Guo Qiang Zhu, Zhu Li
Their main physical properties are shown as Table 1[1].
Table 1 Physical properties of glazed hollow beads physical properties unit performance index granularity mm 0.5~1.5 stacking density kg/m3 80~130 thermal conductivity W/m·K 0.032~0.045 glazed ratio % ≥95 water absorption ratio % 20~50 refractoriness ℃ 1280~1360 end-use temperature ℃ under 1000 Table 1 indicates that glazed hollow beads have many excellent properties such as: light mass, thermal insulation, fireproofing, high-temperature stability, low water absorption and so on.
The ingredient proportioning could affect the physical properties such as, thermal conductivity, compressive strength, permeability coefficient.
In the experiment, nine different samples were respectively made off, then their thermal conductivity, uniaxial compressive strength and other factors were measured. some test blocks are shown in Figure 2.
In the analysis, many complex factors are taken into account in the heat transfer coefficient().
Online since: January 2006
Authors: Kunio Funami, Masafumi Noda
b 2.2 Mechanical properties Mechanical properties under biaxial stress were measured using a prototyped biaxial tensile testing machine.
Consequently, different mechanical properties are observed in materials with the same grain size due to the difference in applied stress modes.
Conclusions Various mechanical properties in the biaxial stress state factors necessary for sophistication of forming working and its simulations were obtained by carrying out biaxial tensile tests using the cruciform specimens under a variety of conditions.
The mechanical properties under uniaxial and biaxial stresses were different for specimens with the same crystal grain size because the deformation mechanisms were different.
The influences of grain size on the mechanical properties were also different between the uniaxial and the biaxial stress states. 3.
Online since: December 2012
Authors: Dong Xia, Li Jing Wang
Table 1 illustrates the results of orthogonal array experiments, where ki is the mean value of yarn tensile strength or fabric K/S value for the factor at ith level, and R is the difference between extreme values of k, i.e. max(k1~ k4) – min(k1~ k4).
The bigger the R value, the more important the factor is for tensile strength and K/S value of the modified fabric.
Consequently, to preserve fabric tensile strength while achieving reasonable high color depth, the optimum levels for three factors tested were time for 1 hour, temperature at 40°C, and H2SO4 concentration at 2% w/w.
As UV affects the para-aramid fiber performance, in particular, mechanical properties, the work of light fastness and UV protection of dyed Kevlar fabrics will be reported in our future publications.
Tesoro, Effect of surface-limited reactions on the properties of kevlar® fibers, Text.
Online since: September 2013
Authors: Wisut Titiroongruang, Santi Chatruprachewin, Chaba Suriya-Amaranont, Laddawan Supadee
DLC films have long been employed as head and disk overcoats due to their excellent chemical stability, physical integrity and mechanical hardness.
The capacitance and resistance values have been influenced by the DLC film properties.
A low capacitance is desirable as it indicates that the film is less likely to generate a charge current, which could affect the magnetic properties of the device.
Another factor which influences weak point of DLC coverage is the shape of the step profile which causes the shadow effect, this factor shall be further characterized.
Yen et al., “Coverage and properties of a-SiNx hard disk overcoat” J.
Online since: November 2020
Authors: Šárka Mikmeková, Dagmar Jandová, Josef Kasl, Ondřej Ambrož
There are two main demanded properties of these steels, namely a good resistance against both the creep and the high temperature oxidation.
ACT is a low-cycle thermal-mechanical fatigue procedure executed on a Gleeble physical simulator.
To check ability of ACT for testing material creep properties the parallel CCT and ACT tests were performed on the samples machined of trial dissimilar weld joint of steels F and FB2 assigned for industrial production of welded turbine rotor and their results were compared.
The results of ACT tests can be given as the creep strength factor (FACT) and converted to the lifetime at the test temperature and normalized stress (100 MPa), as calculated on the principle of accumulated energy to fracture.
The width of the heat affected zones ranges from 3.1 to 3.5 mm on both sides of the weldment.
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