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Online since: September 2023
Authors: Olumoyewa Dotun Atoyebi, Adeyemi Adesina, Samson Olalekan Odeyemi, Mohammed Abdulkareem Adisa, Ahmed Lukman, Adeniyi Olakiitan
Both the fresh and mechanical properties were determined at the Department of Civil Engineering, Kwara State University, Malete. 3.
Fig. 1 Slump flow of CFRSCC Fig. 2 L-Box of CFRSCC 3.2 Mechanical Properties In evaluating the mechanical properties of the concrete mixes, the results of the compressive and flexural strengths are shown in Fig. 3.
Domone, A review of the hardened mechanical properties of self-compacting concrete, Cement and Concrete Composites, 29(1), (2007), 1–12
Elango, Study on mechanical properties of fibre reinforced self-compacting concrete, Materials Today: Proceedings, 45(2), (2021), 3124-3131. doi: 10.1016/j.matpr.2020.12.214
Gonen, Mechanical and fresh properties of fibre reinforced self-compacting lightweight concrete, Scientia Iranica, 22(2), (2015), 313-318
Online since: October 2014
Authors: Si Yi Yu, Jun Mi, Xin You Han
Biodiesel, whose main content is fatty acid methanol esters (FAME), is becoming increasingly accepted as a renewable source to substitute petroleum because of these similar properties to diesel fuel, renewability, biodegradability and environmentally advantages.
Therefore, the biodiesel yield could be calculated by the following formula: ma: actual weight of end-product biodiesel, mt: theoretical weight of end-product biodiesel. 3 Results and Discussions Studies have found that methanol/oil molar ratio, catalyst amount, reaction temperature and time are the four main factors affecting the biodiesel yield in the transesterification [7].
A uniform design experimentation was conducted and only seven experiments were needed for four factors and seven levels.
The four factors mentioned above were labeled as X1, X2, X3 and X4, and the biodiesel yield Y(shown in Table 2).
The above equation indicated that the four factors did not affect the biodiesel yield of transesterification with monotonicity.
Online since: November 2012
Authors: Shun Hua Zhou, Chang Dan Wang, Hui Su
Introduction The differential settlement of ground in horizontal and vertical section is made prevalent in Subgrade Engineering by the factors such as the random difference of properties of soil (natural and artificial treatment) and differences between various types for foundation treatment and structure forms [1-3].
As theoretical values are not able to consider that the factors such as material property, the fiction and loss of additional stress are during the transmission within material.
Because calculated values are based on Boussinesq solution which are not able to consider the fundamental solution of material property.
Some experimentally based fundamental results on the mechanical behavior of granular materials.
Factors affecting stress cell measurements in soil.
Online since: September 2021
Authors: Olga A. Moskalyuk, Diana V. Volnova, Ekaterina S. Tsobkallo, Galina P. Meshcheryakova
Let us dwell in more detail on the structure and properties of this polymer, since this information is important for our study.
In fig. 3 gray areas indicate the intervals of filler concentration values at which the material receives antistatic properties.
It should be added to the above that high filler concentrations significantly impair the mechanical properties of the composite.
Tsobkallo, Textile film threads with antistatic properties based on polypropylene with carbon fillers, TEXTILE-200. (2009) 204
Mechanical and electrical conductive properties of polypropylene fibers filled with carbon nanotubes with a functionalized surface, Journal of Applied Chemistry, 85 (2012) 957–962
Online since: December 2007
Authors: Miloš Janeček, Miroslav Cieslar, Margarita Slámová, Vladimír Šíma
The precipitation kinetics, resulting dispersion of the agehardening phase and their correlations with properties were investigated by differential scanning calorimetry, transmission electron microscopy and tensile tests.
The differences in precipitate microstructure inherited from the pre-treatment affect precipitation kinetics during paint baking and result in different precipitate dispersion and sheet strength.
A solute clustering during the natural aging and a dissolution of the clusters during the artificial aging are the major factors responsible for the deleterious effects of natural aging.
The paper reports results of a study of the effect of processing schemes on the microstructure and properties of a TRC AA6016 alloy.
The microstructure inherited from the pre-treatment affects strongly the kinetics of precipitation during the paint baking procedure.
Online since: September 2014
Authors: Ming Song Zhang, Yi Zhang, Jian Jun Ke, Xiao Wei Li, Lian Bing Cheng
The influence of tangential roller pressure on the stability of circular saw blade Mingsong Zhang1,a,Yi Zhang2,Jianjun Ke1,Xiaowei Li1,Lianbing Cheng1 1College of Mechanical & Material Engineering of China Three Gorges University, 2Hubei Three Gorges Polytechnic, Yichang 443002, China azms@ctgu.edu.cn Keywords: Tangential roller; Roller pressure; The stability of circular saw blade Abstract.
Keke Bian, Dong Zhao, Shiyu Hu[2],who used finite element analysis method, proved that the main factors affecting the rolling tension are the rolling load, rolling times, roll positions and so on.
The material properties of 65Mn is heat-treated by oil quenching at 830℃ and tempering at 540 ℃.Table 1 gives the diamond saw blade sizes, with 0.4 clamping ratio(γ),and 120mm chuck radius.
Figure 2 shows the constraint model of the 30°cyclic symmetry model. 3.Effect of Roller Pressure on The Stability of Circular Saw Blades The factors include rolling radius; rolling times, rolling wideness, and rolling circle angle are taken to study the tangential effect of the roller pressure on the stability of the blade in this paper. 3.1 The radial pressure analysis of different roller pressure Figure 3 shows the radial pressure at different roller pressure.
First the tensile stress changes to compressive stress, then the property of the two kinds of the stress exists at the same time. 3.2 Tangential stress analysis of different roller pressure(Figure 4) (a)P0=10KN (b)P0=15KN (c)P0=20KN Fig. 4 Tangential stress nephogram of different roller pressure The cloud can show that whether the nature of the tangential stress is compressive stress or tensile stress.
Online since: August 2020
Authors: Doğan Çetin, Omar Hamdi Jasim
There are several factors affecting the shear strength performance and the parameters of the compaction such as type of the fiber, the soil, and the length of the fiber as well, generally the addition of the natural fiber to the soil increase the shear strength.
Basic experiments were conducted to identify the engineering properties of the soil.
The properties of the soil.
The properties of the soil.
Ho, Mechanical properties of kaolinite/fiber soil composite, Journal of Geotechnical Engineering, 120(8) 1994 1381-1393
Online since: December 2014
Authors: Jing Liu, Fu Quan Liu, Peng Fei Liu, Hong Hui Zhu, Xin Zhang, Rui Ping Yin, Min Nao
Artemisia sphaerocephala Krasch was random by aerial seeding on test land, and 5 observations evenly set in its community and take the average as result. 2.2.2 Root Mechanical Property Property of tensile mechanical, root-soil surface friction and root-soil composite shear were picked to evaluate soil-reinforcement ability.
We chose the accumulation roots length, represented roots deformation properties, taproots tensile strength, and lateral roots branch tensile strength to evaluate the tensile mechanical property.
Represented roots deformation properties include elastic modulus and constitutive properties.
Although tensile mechanical property was clearly better than other three plants, and the tensile mechanical property of root was the dominant factor in soil-reinforcement, but in this season wind erosion was the major erosion type.
Its root-soil surface friction property was the best, but the crisp and fragile material characteristics of root made Artemisia sphaerocephala had a poor tensile mechanical and root-soil composite shear property.
Online since: August 2013
Authors: Thomas Rainer Neitzert, Maziar Ramezani
Dents not only affect the structural integrity of pipelines but they cause a local decrease in the pipe’s cross-section, which in turn affects the flow through the pipe (Cosham and Hopkins, 2004).
The size, shape, and location of the original dent affect the remaining life, as do external factors such as the constraint provided by the surrounding soil.
The pipe material is steel and the true stress–true strain curves were obtained from tensile experiments and plastic material properties are included, with nonlinear isotropic strain hardening.
The spring back and rerounding behavior of a dent depends upon the pipe geometry, the material properties, whether the pipeline is pressurized or unpressurized, and the shape of the dent.
International Journal of Mechanical Sciences 47 (12) , pp. 1949-1971
Online since: October 2010
Authors: Hong Wei Wang, Xing Quan Zhu
And the most important requirements of a good separator include the following: good mechanical properties, minimal electrolytic resistance (good conductivity of ions), electric insulation, and chemical resistance to degradation by electrolyte or the active electrode materials.
Polypropylene (PP) membranes have been commonly used in secondary lithium batteries owing to their high mechanical strength and proper thermal barrier property.
The relative percentages of elements were calculated by integrating peak areas using atomic sensitivity factors.
The S2p signal was used rather than S2s; the Kratos library accounts for the different angular asymmetry factors for s and p orbitals.
Table 1 lists the PP and modified PP membrane data obtained by XPS, calculated from the atom peak areas using atomic sensitivity factors.
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