Search results

Without the polarization, the composites will have no piezoelectric properties.
Results and discussion Influence of poling temperature on the piezoelectric properties.
So the piezoelectric properties of the piezoelectric composites are also improved.
The relationship of electromechanical coupling coefficient, mechanical quality factor and the acoustic impedance with the poling temperature are shown in Table 1 and Table 2.
The planar electromechanical coupling factor Kp, thickness electromechanical coupling factor Kt, mechanical quality factor Qm and acoustic impedance Z of the composites change little with different poling temperature.

The investigation of the crystallization behavior and the mechanical and thermal properties of high-molecular-weight DM-FDCA-based polyesters, have been reported [8–12].
Table 3 The thermal properties of PEF samples for 2nd heating DSC.
Boutevin, Study of thermal and mechanical properties of virgin and recycled poly(ethylene terephthalate) before and after injection molding, Eur.
Zhu, Modification of poly(ethylene 2,5-furandicarboxylate) with 1,4-cyclohexanedimethylene: influence of composition on mechanical and barrier properties, Polymer 103 (2016) 1–8
Koros, Chain mobility, thermal, and mechanical properties of poly(ethylene furanoate) compared to poly(ethylene terephthalate), Macromolecules 47 (2014) 1383−1391

And the property of recycled coarse aggregate after cleaning has the performance of guaranteeing the quality by using.
2 ~ 3 times of cleaning in order to ensure construction quality before using, so the test carry out a purge of recycled coarse aggregate and the determinate basic properties of the aggregate after cleaning. 3.
the workability of concrete, which directly affect the quality of the project.
How much of the needle flake particle content mainly related to the aggregate physical properties and the choice of processing machinery and production technology.
Consider choose native concrete experiment, and contrast to test data of apparent density, concluded: the main factors which affect the apparent density of recycled coarse aggregate are cement mortar content and impurity. 3.8 Cleaning effect on the basic performance of recycled coarse aggregate The three types of recycled coarse aggregate are washed three times, and the determination the change of its water absorption, fine powder content and crushed indicators, the test results are shown in Table 2, Table 3 and Table 4.

As the applied energy density transpires as a decisive parameter, a variation leads to significant changes in UTS and endurance limit, whereas an adjustment of scan-speed and laser power at a constant energy density do not affect the mechanical properties.
Against this background, we report on a comprehensive study of process parameters, affecting static and dynamic mechanical properties, as well as the impact of ambient temperature on the components load capacity.
Furthermore, the mechanical properties are characterised at different ambient temperatures, evaluating the ultimate tensile strength at different application conditions.
The components structure is highly affected by the applied energy density, as the heat input determines the melting quality and subsequently the mechanical properties of the PA-12 components [6].
At first, the applied energy density can be determined as a decisive factor, regarding the component quality and the mechanical load capacity.

The excellent combination of thermomechanical properties makes silicon nitride a good candidate for applications where high hardness and mechanical properties are fundamental.
The improve of mechanical properties of silicon nitride comes from many factors, like refined microstructure by restraining grain growth, localized stress, crack tip bridging, etc.
Within these factors, microstructure formation of the silicon nitride is critically important for the final properties.
The improve of mechanical properties of silicon nitride based composites comes from many factors, like refined microstructure by restraining grain growth, localized stress, crack tip bridging, etc.
Within these factors, microstructure formation of the silicon nitride matrix is critically important for the final properties [7].

The effect of short-term aging on rheological properties of asphalts was studied.
Introduction Asphalts ageing is one of the principal factors causing the deterioration of asphalt pavements.
It is responsible for a deterioration of the physical and mechanical properties of the asphalt binders [2,3].Rolling thin film oven test (RTFOT) are used for examining the thermal degradation during short-term ageing [4,5].
Its basic properties were illustrated in Table 1.
Consequently short-term aged process mainly influences the low temperature properties of asphalt.

It was determined the mechanical and physics properties of the two types of blocks of zirconium stabilized with ytria.
The blocks have been sinterized at 1530 oC and their mechanical and physics properties were measured.
It was not observed an important difference among the microstructures and mechanical properties of the analyzed zirconium blocks.
The Weibull parameters “m” and so were determined using correction factors according to the number of samples used (DIN-51-110).
Mechanical properties evaluations were conducted using similar methods to allow comparison of the blocks properties.

However, morphology and microstructure of carbon nanofibers are affected by synthesis conditions, such as stability of flames and sampling time, sampling temperature etc.
Different Influence factors were depicted in detail.
Introduction Carbon nanofibers have been extensively studied recently because of their unique mechanical and physical properties, such as high mechanical strength, remarkable electronic structure [1, 2] and capillary properties [3].
The morphology and microstructure of carbon nanofibers are affected by synthesis conditions, such as stability of flames and sampling time, sampling temperature etc.
The morphology and microstructure of carbon nanofibers are affected by synthesis conditions, such as stability of flames and sampling time, sampling temperature etc.

The effects of preparing conditions on the mechanical properties of KGM/CaCO3 composite films.
The effects of swelling time, CaCO3 and KGM on the properties of the composite membrane were studied through the orthogonal experiments using L9(34).
It is indicated that the effects of the factors on the tensile strength of the composite membrane were different.
Factor Tensile strength / MPa A B C 1 1 1 1 43.35 2 1 2 2 36.06 3 1 3 3 25.48 4 2 1 2 32.60 5 2 2 3 30.04 6 2 3 1 26.92 7 3 1 3 28.11 8 3 2 1 32.03 9 3 3 2 33.26 Fig.4 Relations of factors and levels on TS of KGM/CaCO3 composite films Fig.5 Range comparison of factors affecting on TS of KGM/CaCO3 composite films Table 3 ANOVA of experimental factors affecting the tensile strength of KCaCF source SS Df MS F F0.05 Swelling time 42.42 2 21.21 0.74 19.00 CaCO3 58.80 2 29.40 1.02 KGM 75.92 2 37.96 1.32 Error 57.41 2 28.71 Table 3 indicated that there was one factor greatly affecting the tensile strength of KGM/CaCO3 composite film (which is detected by p>0.05).
Zhao: China Pulp Pap., Vol. 23 (2004), p. 14 [7] GB13022-1991 Plastics-Determination of tensile properties of films.

Several piezoelectric properties were also affected by the heat treatment.
Electromechnical coupling coefficients of heat-treated LNN became about two thirds of those before the heat treatment, and mechanical quality factors became about six times larger.
Table I shows piezoelectric properties of LNN ceramics before and after the heat treatment, and PZT_Fe.
The electromechanical coupling coefficients became about two thirds and mechanical quality factors became about six times larger.
Piezoelectric properties of LNN ceramics before and after the heat treatment, and PZT_Fe.