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Online since: September 2011
Authors: Xiao Xing Shen, Qing Fu Zhang, Wen Fang Yang, Yan Li Qiao
Breaking strength and elongation at fracture were increased; the beginning of dyeing properties and the balance rate were increased.
Low-temperature plasma treatment can modify the surface properties of wool fiber without much change in the original bulk properties.
(2) The volume of retraction bulb The volume of retraction bulb was used to characterize the anti-felting properties.
(5) Dyeing rate [11] Results and discussion 3.1 The effects of low temperature plasma treating time for wool fiber properties 3.1.1 Wettability Experiments showed that wool fiber treated with plasma rapidly submerged into water in less than 1s; while untreated wool fiber floated on distilled water surface, 10min or more didn’t sink. 3.1.2 The influence of wool fiber surface a. crude wool b.1min c.4min Fig.1 Photos for different plasma treating time on the wool fiber Fig. 1 shown that the flake structure of untreated wool fiber was clearly visible, with edges and corners obviously; 1min, the surface scale layer was partly divested or inactivated, made the surface smooth; while for a long time, the surface occurred concave-convex due to sculpture. 3.1.3 Directional friction effect and mechanical properties Table 1 The influence of mechanical properties with different plasma treating time Time/min DFE/% Breaking Strength/cN Elongation at Break/% 0 16.69
Fig.2 The volume of retraction bulb of different plasma treating time Fig.3 Staining with LANASET Blue 3.2 Low temperature plasma processing power for wool fiber properties 3.2.1 Directional friction effect and mechanical properties Table 2 The influence of mechanical properties with different power plasma treated on wool fiber Power/W DFE/% Breaking Strength/cN Elongation at Break/% 0 16.69 20.58 3.49 800 8.19 22.81 3.90 1200 5.77 23.66 4.15 1500 4.75 25.25 4.26 1800 4.29 25.58 4.36 2000 4.74 22.35 4.11 2200 4.72 20.43 3.49 As shown in Tab. 2, with the plasma power increase, the directional friction effect of wool fiber was reduced significantly; the breaking strength of wool fiber presented to rising first and falling followed; the variation trend of breaking strength and elongation was similar. 3.2.2 Felt shrinkage properties.
Online since: October 2010
Authors: An Shun Cheng, Chung Ho Huang, Tsong Yen, Yong Lin Luo
The concrete that adds suitable amount of pozzolanic materials (ex. 10% slag + 10% fly ash) has the optimum microstructure and mechanical property.
Such that, adding slag and fly ash will change the microscopic properties of mortar at early and late ages.
The strength of concrete at early age mainly comes from the cement hydration, so the dominated factors are of W/B or the cement content.
All the interaction effects’ variances of factors are very small, it can be concluded that the main effect of slag or fly ash to the strength won’t be affected by the other mineral admixture.
As the age reaches 91 days, W/B still has the greatest influence, and the other factors have no significant influence.
Online since: September 2013
Authors: Ming Hua Huang, Hui Dong, Di Ru Xu, Duan Cheng Wang, Yong Shun Cui, Qing Hua Chen
But as cartilage scaffolds, its degradation rate is rapid; the mechanical properties are poor; water-holding capacity is insufficient and the porosity is not high.
Its degradation and mechanical properties can be regulated by changing the crosslinking degree.
For the purpose of gaining the optimal experimental program of the cartilage scaffolds, in this study, carried out the four-factor three-level orthogonal design L9 (34) experiment in which the four factors were the KGM content, the COL II content, the ammonia content and the freeze temperature since they played a vital role in the structures and the comprehensive properties of the cartilage scaffolds.
The influence of each factor and level on the comprehensive properties is shown in Fig. 1.
Table2 Water absorption of KGM content (g) initial mass (g) water absorption (%) 1.0 0.168 829 1.5 0.275 846 2.0 0.298 892 different KGM content Fig.1 The curves of each factor and lever affecting comprehensive properties The Water Absorption Analysis.
Online since: July 2014
Authors: J. Revanthkumar, G. Venkatachalam, A.K. Jeevanantham, M. Thirupathi Reddy, Rama Kishore G. Babu
Utilization of non-fortified polymers as structure materials is constrained by low level of their mechanical properties, specifically quality, modulus, and effect safety.
It is clear from the results of ANOVA that the feed rate is the dominant factor affecting surface finish Ra.
Fig. 5 presents the influence of two factors on surface roughness, (i.e.
It can be seen that the CNSL% is the most important factor affecting surface finish Rt.
It can be seen that the Feed is the most important factor affecting surface finish Rz.
Online since: October 2013
Authors: Yan Xiang Li, Yu Tong Zhou, Xing Nan Liu, Wen Wen Yuan
The difference in microstructure features of the cell walls will also make the aluminum foams different in mechanical properties.
In the past period of time, a lot of researchers have focused on the issues of porosity and pore structure characteristics of aluminum foams, which are decisive factors in their mechanical property, acoustic property and thermal property [4-5].
The thickness of cell wall is considered to be one of the most important parameters to determine the mechanical properties of aluminum foam.
In recent years, the influence of element type, element content, particle type, mean size of particles and other affecting factors on the thickness of cell wall has been studied deeply by some researchers [9-10].
It, in essence, presents in the microstructure as an inclusion, posing a detrimental effect to mechanical properties of materials.
Online since: April 2013
Authors: Nuria Fernández Castro, Hieres Vettorazzi da Silva, Rosana Elisa Coppedê
Rock Properties versus Blades and Grit Consumption in Granite Multi Blade Sawing Process Hieres Vettorazzi da Silvaa, Nuria F.
Petrographic Characteristics that Affect Mechanical Strength.
Being quartz easily deformable and, at the same time, very important for mechanical properties of rocks, this type of microstructure may affect their behavior in the sawing process.
An extensive literature review about petrographic properties as intercrystalline textures, mineral fabric and descriptive and discursive papers on characterization tests and mechanical properties of stones was also analyzed in order to promote better understanding of the parameters involved in the sawing of commercial granites in conventional multi-blade gang saws.
Kibici: Relations between some quantitative petrographic characteristics and mechanical strength properties of granitic building stones.
Online since: September 2015
Authors: Monika Kašiarová, Pavol Šajgalík, Miroslav Hnatko, Zuzana Pramuková Vilčeková, Magdaléna Precnerová Domanická
The microstructure and local mechanical properties (Young’s modulus and Yield strength) were evaluated and compared with human trabecular bone.
If the materials are intended for trabecular bone replacement it is necessary to take into account several factors.
In addition to bio-compatibility, bio-activity and cytotoxicity, materials shall meet the desired porosity and mechanical properties [2].
Both mechanical properties are important in the comparison between matrix of porous samples and trabecular bone.
Experimental methods Density, porosity and mechanical properties (Young's modulus and Yield strength) were determined for each sample.
Online since: December 2014
Authors: Guang Chun Wang, Wei Zheng, Bing Tao Tang, Liang Chen
While, for the grain boundary region, the parameter M is supposed to be the average value of the orientation factors of the two grains on both sides of the grain boundary.
Orientation factors.
The grain orientation affects its mechanical properties along the deformation direction.
And the orientation factors are 2.64, 2.45 and 3.67 for these three orientations, respectively.
When the specimen size is smaller, the volume fraction of surface grains is higher and thus the mechanical properties of surface grains mainly affect the total flow stress of the specimen.
Online since: December 2024
Authors: Rami Hawileh, Jamal A. Abdallah, Ghada Karaki, Maha Assad
The behavior of RC walls under fire exposure is affected by various factors, such as slenderness ratio, concrete strength and composition, and axial load.
Previously conducted experimental studies have shown that several factors affect the behavior of RC walls under fire, including the concrete compressive strength, wall thickness, reinforcement ratio, axial load and lateral load levels, and boundary conditions, among others [10-16].
The effect of some of these factors was also studied in previous numerical investigations.
Moreover, mechanical properties needed for structural analysis include modulus of elasticity, compressive and tensile strengths, stress-strain curves, thermal expansion, and their variation with temperatures.
Naser, “Assessment of critical parameters affecting the behaviour of bearing reinforced concrete walls under fire exposure,” Journal of Structural Fire Engineering, 2023, doi: 10.1108/JSFE-07-2023-0029
Online since: October 2011
Authors: Shao Ji Chen, Cui Ping Zhang, Shuai Zhang, Zhe Li
So as to improve its mechanical properties, the section steel is added in the shaped reinforced concrete columns.
The numerical method was adopted in this article to compile a computer program[3] of full-range nonlinear analysis which can be used for the further research on the mechanical properties of steel reinforced concreteT-shaped columns (SRCTSC) subjected to biaxial eccentric compression.
of SRC_T1 Factors affecting sectional curvature ductility Influence of loading angle.
Influence of other factors.
Therefore, the load angle ,axial compression ratio ,the ratio of stirrup spacing and the diameter of longitudinal reinforcement ,are all the major factors affecting the SRCTSC subjected to biaxial eccentric compression, meanwhile, the curvature ductility coefficient and a, n, s / d meet certain numerical relations.
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