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Online since: July 2022
Authors: Evgeny Velichko, Nikolay Vatin
In the production of self-compacting concretes, it may be necessary to ensure a number of conflicting factors that contribute to the non-segregation of the mixture and its high-quality compaction.
In this case, the amount of substituted cement will significantly depend on the pozzolanic activity of MM, which affects the degree of hydration of clinker minerals, the nature of the products of hydrate phases, the formation of the properties of the contact zone between MM particles and neoplasms, and the integral strength of the MCC.
On the surface of the concrete mixture, uniformly distributed grains of coarse aggregate are observed, confirming the above-mentioned properties (Fig. 7).
[5] Velichko E.G., Shumilina Yu.S., On the problem of the formation of dispersed composition and properties of high-strength concrete.
Saltykov A.A, Bekmansurov M.R., Directional control of the structure and properties of gypsum compositions, Advanced materials in construction and mechanical engineering, 60-67 (2014)
Online since: February 2008
Authors: Sukkaneste Tungasmita, T. Seppänen, Satreerat K. Hodak
In general, the partial pressures of reactive gases strongly affect the stoichiometry of the growing films.
However, increasing the energy of ion irradiation more than a critical energy can cause an influence on porosity of the film which affects the properties of the films due to re-crystallization and resputter processes, which can increase the defect density in the film microstructure [12].
Ion-assisted energy corresponding to the substrate bias is an important growth parameter which can be used to modify microstructure and mechanical properties of the (Zr,Ti)N film coatings via the growth mechanism.
The strain energy becomes the dominant factor for the film microstructure.
Online since: June 2017
Authors: Ji Xue Zhou, Bai Chang Ma, Yuan Sheng Yang, Yun Teng Liu, Di Zhang, Tao Lin
Introduction Magnesium alloys have been considering as promising substitutions for heavier alloys due to their unique properties, such as low density and high specific strength.
In order to get high quality parts, understanding of the dynamic recrystallization (DRX) during hot extrusion is important because the microstructure change has a great influence on mechanical properties of the extruded parts [2-3].
The physical properties of the workpiece and tooling materials were listed in Table 1[16,17].
The friction factor m (0≤ m ≤1) is 0.4 at the workpiece/tooling interfaces.
Extrusion temperature is a key parameter, which directly affects the volume fraction of dynamic recrystallization in the extruded tube.
Online since: December 2012
Authors: Ju Rui Yang, Jun Ning Li, Jing Luo
Foreword Flow turbulence diffusion coefficient caused by the presence of plant decreased, not only could effectively block passage of sediment movement, but also could effectively intercept suspended sediment, promote the deposition of sediment, directly affect vertical distribution order of suspended sediment concentration[1].
To study the flow characteristics of suspended sediment with vegetation could not directly use the traditional mechanical movement of sediment, and must take into account the impact of factors: vegetation density, shape, rigid and the submerged condition [5].
At the plant height of 9 cm, with the flow rate of 5.3L / s the difference of Re between before and after the plant is the largest for 17.03%. 2.4 the roughness analysis of sediment-laden flow with plant Sediment-laden flow through plants, the roughness is affected by the tank bottom, the plant’s presence, growth of plant status and the viscosity of sediment-laden flow and so on.
Research shows that the suspended sediment concentration has impact on Manning roughness among the same factors [6].
The properties of Sediment-laden flow and the mechanism to intercept sediment with different slope of grass [J], Water Science,2007,7:490-495.
Online since: October 2009
Authors: Federico Tordini, Sergio Baragetti
The fatigue and the RCF behaviour of coated components can either positively or negatively be affected by the presence of thin hard coatings.
As a matter of fact, suitably coated light alloys with similar or even better performances than those of traditional steels would be advisable for a number of mechanical applications.
Compressive residual stresses of about 7.08 GPa were detected in the coating by XRD analysis and, due to their negligible influence on the yield strength of the base material, they were considered the main reason for the improved fatigue properties.
Fig. 6 shows the critical crack depths for the studied coated and uncoated steel and titanium spur gears with the indication of the threshold and of the applied stress intensity factors ranges, i.e.
SEM observations showed that the deposition process could not significantly affect the typical RCF damage (Fig. 8).
Online since: January 2022
Authors: Emiru Yidnekachew Melesse, Tesfaye Kassaw Bedru, Beteley Tekola Meshesha
This study indicates that high strength mechanical property and good surface properties paper can be produced from banana pseudostem pulp with a more environmentally friendly pulping process.
The banana pseudostem possesses good physical strength properties [20].
Thus, it implies good bonding properties, and the printing area also smooth [49].
Physical, chemical, and mechanical properties of corn sheath as pulp and paper raw material.
Some Chemical and Morphological Properties of Wheat Straw.
Online since: June 2019
Authors: Javad Tashakori, Javad Razzaghi, Sara Ansari
By doing this, involving factors can be assessed in future studies. 3.
Fig. 1 Geometry of experimental shear links [20] Mechanical properties of tested steel links [22] Table 1 BT-LP225 BT-LP100 BT-HT440C A709M HPS 485w A709M Grade 345w Specification LYP225 LYP100 HT440 HPS485 GR345 Abbreviation Low yield point steel Low yield point steel Structural grade steel High performance steel Structural grade steel General classification 225 100 440 485 345 Nominal yield stress [MPa] 195100 153100 208200 201300 186200 Measured Elasticity Module [MPa] 242 76.5 501 503 353 Measured Yeild stress [MPa] 4.
It can be concluded that the overstrength is a function of material properties.
Hu, S., et al., Analytical and Numerical Investigation of Overstrength Factors for Very Short Shear Links in EBFs.
Pense, Characterization of cyclic inelastic strain behavior on properties of A572 Gr. 50 and A913 Gr. 50 rolled sections, in ATLSS Rep.
Online since: December 2025
Authors: Yufang Wu, Xiao Duo Ou, Jie Jiang
Numerical predictions are further constrained by incomplete property data, model simplifications [20], and substantial data and computational demands that affect cost-effectiveness [21].
In fact, choosing too many influencing factors as feature inputs for ML training may lead to inaccurate prediction results.
In the original dataset, different features may have varying units and scales, resulting in imbalanced feature weights and adversely affecting the model performance.
To identify the key factors affecting the WI prediction, the Sobol sensitivity analysis method was used to evaluate the model quantitatively.
(5) Sobol sensitivity analysis revealed that GL and WYP are the most critical factors influencing WI predictions.
Online since: August 2014
Authors: Luba Bicejova, Ján Kmec, Sona Rusnáková, Daniel Kučerka, Martin Podařil, Vladimir Rusnák
These properties can be achieved in several ways.
This prepreg material has been developed for industrial and rail applications with high specific mechanical properties and excellent FST (low heat - release and smoke-density) behaviour [23].
Fig. 1 (a) Curing conditions A=130 ºC/3 hours; (b) Curing conditions B=150 ºC/ 3 hours Mechanical properties of sandwich structures Effect of curing temperature versus on bending strength The aim of this part of research was to determine the effect of curing condition on the basic strength properties - elastic modulus and flexural strength of sandwich construction.
With increasing temperature, strength and modulus decrease significantly, while at low temperature mechanical properties are rising sharply, modulus about 19%- type 1-1; 16%= type 2-2; 8%- type 2-1, strength about 9%- type 1-1; 10%- type 2-2 and 6% - type 2-1.
Thickness of skin (number of prepregs) can improve the material properties of composites.
Online since: January 2013
Authors: Ireth García Aguilar, María Fabiana Laguna, Pierre Arneodo Larochette, Jorge Luis Pelegrina
Such materials are mainly alloys of metallic elements, but there are also ceramic materials having this property [2].
Figure 2: Evolution of Φm, the fraction of the system in martensite, as a function of A0, the "temperature" parameter, for several rates vA (speeds should be multiplied by a factor 10-9).
In the case of the experimental results, the fraction Φm was deduced from the ratio between the change of the measured property at each temperature and the total variation, after extracting the temperature dependence in the single phase regions.
The cooling speed has been change by a factor greater than 350, from which the variant configuration previous to the heating experiment was expected to have a considerable variation.
In order to analyze to what extent the variant configurations affect the transition, we compared the simulations and the experimental results by plotting the observed “temperature” shift as a function of the heating speeds.
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