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Online since: January 2014
Authors: Wen Bai Liu, Liang Yang, Shuai Liu
When the ratio of diameter to height is less than 1.2, the ratio of the ultimate vertical bearing capacity and the ultimate displacement changes significantly; and when the ratio of diameter to height is greater than 1.2, the ratio of ultimate vertical bearing capacity and ultimate displacement is not affected obviously.
Figure 1(c) shows a bucket foundation made in steel, with the material properties shown in Table 1 and the specific shape shown in Figure 1(d).
(a)Experiment equipment (b)Model experiment box (c)Bucket foundation (d)Specific shape Figure 1 Experiment equipment Table 1 Physical and mechanical property indicators of the bucket foundation and the soil Density ρ [㎏/m3] Poisson ν Elastic modulus E Cohesion C Internal friction angle φ [º] Moisture Content w [%] The bucket foundation 7850 0.167 2.00E+11 - - - Fine sand 1300 0.3 1.20E+06 0 33 5.2 Table 2 Experiment scheme Model number Diameter [mm] Height [mm] The ratio of diameter to height Depth t1 [mm] Depth t2 [mm] 1 75 100 0.75 5 5 2 90 100 0.9 3 120 100 1.2 4 160 100 1.6 5 160 80 2 6 160 120 1.33 7 160 160 1 8 160 200 0.8 The results and analysis of the experiment Experimental data is obtained mainly from the displacement of the Number1-8 bucket foundation under every level load.
Table 3 The ultimate bearing capacity and ultimate displacement of the Number 1-8 bucket foundation Model number Diameter [mm] Height [mm] The ratio of diameter to height Volume [mm3] The ultimate bearing capacity Pu [N] The ultimate displacement Su [mm] The ratio of the ultimate bearing capacity The ratio of the ultimate displacement 1 75 100 0.75 161125兀 822 -3.5 1 1 2 90 100 0.9 202000兀 1185 -4.6 1.442 1.314 3 120 100 1.2 290500兀 2350 -7.8 2.859 2.229 4 160 100 1.6 422500兀 2650 -8.9 3.224 2.543 5 160 80 2 360500兀 2410 -8.3 2.933 2.364 6 160 120 1.3 484500兀 2780 -10.0 3.382 2.857 7 160 160 1 608500兀 3075 -11.1 3.741 3.171 8 160 200 0.8 732500兀 3433 -11.9 4.176 3.4 The ultimate bearing capacity data analysis 3.1 Influencing factors of the ultimate bearing capacity 3.1.1 The influence of diameter on the ultimate bearing capacity of the bucket foundation As No.1-4 buckets foundation is analyzed, on the condition that the height is unchanged, a relationship curve is drawn
Also, Figure 3 shows that it is wise to select the ratio of diameter to height 1.2, consequently, the ratio of diameter to height = 1.2 can be used as the optimum point of the ratio of diameter to height of the bucket foundation. 3.2 Influencing factors of the ultimate displacement 3.2.1 The influence of diameter on the ultimate displacement of the bucket foundation As No.1-4 buckets foundation is analyzed, on the condition that the height is unchanged, a relationship curve is drawn between the ratio of the ultimate displacement under vertical load and the ratio of diameter to height , as shown in curve 1(Figure 4).From the curve, when the height of the bucket foundation is constant, displacement of the bucker foundation under vertical load increases with the ratio of diameter to height , if the diameter to height ratio is less than 1.2, the ratio of the bucket foundation vertical displacement increases greatly with the ratio of diameter to height , and the curve slope increases
Online since: October 2010
Authors: Yong Chen, Xing Wei Shi, Xiao Yu Liu, Guo Jun Gou, Hui Xu
The acid concentration and nano-CeO2 particles affected the crystallinity of PANI fibers.
PANI usually combined with other inorganic nanoparticles to form nanocomposites in order to improve physical, mechanical, electrical properties [9-11].
These particles not only combine the advantageous properties of inorganic components and polymers, but also exhibit many new characteristics that single-phase materials do not have.
The main reason for this result is due to the structure of conducting PANI and the doped property with protonic acid.
The protonated degree of the polymer chains of PANI is the main factor for preparing conducting PANI fibers, which determined the degree of expansion and extension of polymer chains in the solution.
Online since: April 2009
Authors: Deepika Sharma, Sachin Tyagi, K.K. Raina
An attempt has been made to understand the influence of carbon nanotubes on dielectric and morphological properties of ferro-electric liquid crystal.
A new approach is proposed recently which is based on the idea of controlling the properties of the composites by adding small amount of nanotubes into LC matrix.
Our research therefore explores the factors that affect the spatial distribution of these nanotubes and thus control morphology of nanotubes- liquid crystal composites.
At the same time the nanotubes are sufficiently large to maintain the intrinsic properties of the materials and share these properties with the LC matrix due to anchoring with the LC.
The inherent conductivity and spontaneous self alignment properties of CNTs make them an attractive alternative as an alignment layer.
Online since: June 2012
Authors: Wei Song, Jian Chen, Gui Cheng Wang, Gang Liu
Thus, the performance of dynamic balance and the life of thermal fatigue will be affected.
The life of HSK is influenced by many factors .When the tools are embedded into or taken out from the shrink toolholders, the toolholders need be heated and cooled.
The material property can be checked in the handbook [6].
The experimental optimal temperature can be got by using the main factor analysis method, Table 3.
[5] C.S.Li, D.B.Huan in: Mechanical Engineering Material Manual (Electronic Industry Publishing, Beijing 2007)
Online since: August 2014
Authors: Xiang Kun Sun
Bayesian network nodes represent different parameters; arrows indicate dependency relationship between the two parameters, the arrow by impact factor points to the results.
We can see from the figure, the patient's age, occupation, diet can affect the probability of disease, and the disease also affect the patient's symptoms.
A neuron is a simple computing device; the computing device can enter a property value of the output of other neurons, or an object.
Mechanical industry press, Beijing, 2001, 2001.8-9
Online since: October 2012
Authors: Yong Feng Qi, Qin Chen, Ya Qi Gong
In the present paper, the mechanical behavior of a larger spiral case with combinatorial embedding manner is analyzed by using 3-D non-linear finite element method.
The embedding manner of keeping internal pressure is unsuitable for this project affected by the construction conditions.
Computational method For exact modeling [2][3], nonlinear finite element analysis on reinforced concrete structure should including the simulation of the nonlinear stress-strain constitutive relation of concrete, concrete properties after cracking and the interaction between concrete and reinforced bar.
Considering the safty of structure and the economical factors, the present paper suggests that the laying range of cushion extents to the 45° cross-section of spiral case and adopts C40 concrete from 270° cross-section to the bottom of spiral case.
Online since: July 2017
Authors: Elvis K. Tiburu, Edmund O. Aidoo, Ali Salifu, Heidimarie N.A. Fleischer, Gloria Manu, Abu Yaya, Han Zhou, Johnson K. Efavi
However, the colloidal stability, phase behavior, and solubility of aluminosilicate zeolites have been cited as factors limiting their biomedical applications [12].
Also the development of hydrogels for bioengineering of cardiac grafts, stem cell delivery, and as platform for engrafting tissues such as multiple growth factors are linked to the successful isolation of algae compounds.
Considering their great diversity and potential, research on the identification of new biologically active macromolecules can derive new nanocomposites with long-term stability and outstanding biological properties [32].
These results revealed important findings indicating that nanocomposite of zeolites could be formulated at high polymer concentration without affecting the properties of the naked zeolite, and this is significant for biomedical application where biocompatibility and rapid biodegradable materials are versatile.
Souto, C.F. da Silva, Design and characterization of chitosan/zeolite composite films--Effect of zeolite type and zeolite dose on the film properties, Mater Sci Eng C Mater.
Online since: June 2010
Authors: Erween Abdul Rahim, Hiroyuki Sasahara
Similarly, as reported by Ezuqwu et al. [5] increasing the cutting speed and feed rate increases the hardness and depth of the affected layer.
At the tested cutting conditions, the heat affected zone was ranged from 0.15 to 0.3 mm and 0.05 to 0.1 mm for synthetic ester and palm oil respectively.
These factors contributed to the reduction in the microhardness value.
It has been observed that the mechanical property underneath the machined surface has been altered where the hardness is slightly higher than bulk material hardness.
There is clear damaged surface such as grooves, cavities, smeared materials and microcracks thus affected the surface roughness value.
Online since: December 2015
Authors: Oluwaseun Taiwo, Kelani Bello, Ismaila Mohammed, Olalekan Olafuyi
They alter the interfacial properties significantly; in particular, they reduce the surface tension or IFT.
Wetting conditions (contact angle), and surfactant adsorption were imperative factors.
Consequently, larger zones were not affected by the surfactant flood.
• The flow rate of surfactant can affect additional oil recovery
Factors influencing the recovery of petroleum from unconsolidated sands by waterflooding.
Online since: January 2013
Authors: Zhong Xian Li, Xiu Lan Cheng, Zhi Min Wang
With their very thin thickness and unique properties, graphene and GO may be the most proper materials to get nanopores[7,8].
Properties Graphene attracts immense interest for its unique physical properties, chemical tunability, and potential for the third generation DNA sequencing application[9,10].
Graphene is in fact a single atomic layer of carbon atoms with remarkable electrical and mechanical properties.
These lead to that some properties of GO are unlike or even opposite with graphene.
Graphene and Graphene Oxide: Synthesis, Properties, and Applications.
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