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Online since: November 2011
Authors: Li Li Zhang, Feng Rui Zhai, Hong Wei Zhang, Can Bang Zhang, Jia Jin Tian
Preparation and Property of Al87Ce3Ni8.5Mn1.5 Nanophase Amorphous Composites Hongwei Zhanga, Lili Zhang, Fengrui Zhai, Jiajin Tian and Canbang Zhang Department of physics, Honghe Unversity, Mengzi 661100, China a zhhw7272@126.com Keywords: Rapid solidification; Al87Ce3Ni8.5Mn1.5 amorphous alloy Abstract.
The higher mechanical strength of Al87Ce3Ni8.5Mn1.5 nanophase amorphous composites has been obtained with two methods.
Introduction Al based polymer-nanoparticle amorphous composite materials with its excellent mechanical properties become one of the research focuses in the field of materials [1-4], such alloys belong to Al-TM-RE (TM = transition metal, RE = rare earth element) department.
With annealing temperature increases, the microhardness of alloy increases. in addition to the high hardness of the a-Al supersaturated solid solution ,there are also some other factors that affect the hardness, such as a-Al grain size, volume fraction, the solute concentration degree [3] of surplus amorphous matrix and so on .
Online since: August 2013
Authors: Lei Gang Wang, Yao Huang, Ting Zhou
Among them stamping formability is the most important aspect, which includes basic mechanical property, formability and effects of zinc coating in stamping process.
Therefore research on stamping formability of hot-dip galvanized sheet and analysis of its influencing factors are meaningful[4].
The initial and boundary conditions of the simulation are also set, including material properties of sheet, boundary of sheet, punch and die, blank holder force, coefficient, initial speed of binder, speed of punch etc.
On the one hand, the zinc coating leads that crystal structure, chemical composition and mechanical property of galvanized sheet are totally different with those of bare board.
Effect of microstructure and texture on formability and mechanical properties of hot-dip galvanized steel sheets [J].
Online since: October 2012
Authors: Wen Zhong Zheng, Kun Wang, Hui Hui Luo
Fig.1 Sketch of separated out-jacketing frame and joint Although experimental study is an essential approach to acquire the performance of this new type of frame structure, there still exist some defects such as fewer investigated factors and expensive cost to limit the tests.
Table 1 lists the mechanical properties of steel of Grade Q235, the reinforced bars of Grade HRB335 and the stirrups of Grade HPB235.
Table 2 and 3 gives the mechanical properties of prestressing tendons and concrete, respectively.
a) b) Fig. 2 Reinforcements of two specimens (units: mm) a-SRCF; b-PSRCF Table 1 Mechanical properties of steel Specification Yield strength fy [N.mm-2] Ultimate strength fu [N.mm-2] Elastic modulus Es [N.mm-2] I16a 302.3 450.3 2.0×105 ∠70×6 287.0 424.3 2.0×105 -5 312.0 446.3 2.0×105 10 12 348.7 338.6 522.7 494.0 2.0×105 2.0×105 10 303.0 445.0 2.0×105 Table 2 Mechanical properties of prestressing tendons Diameter D[mm] Failure strength fu [N.mm-2] Nominal yield strength f0.2 [N.mm-2] Elastic modulus Es [N.mm2] 5.0 1686 1470 2.0×105 Table 3 Mechanical properties of concrete Specimens Members axial compressive strength fc (MPa) Elastic modulus Ec[N.mm-2] SRCF Column 30.4 3.42×104 Beam and joint 44.3 3.70×104 PSRCF Column 29.0 3.38×104 Beam and joint 45.2 3.72×104 Fig.3 shows the loading sketch and locale.
The low cyclic horizontal loading was applied along the axis of the beam with the frame fixed on the ground and constant vertical load affected on the columns and beam.
Online since: November 2012
Authors: Mamoru Aizawa, Nobuyuki Kanzawa, Michiyo Honda, Yuri Habuto, Hitomi Ohsugi
To better understand the anti-bacterial properties of IP6-HAp cement, we studied the anti-bacterial activity of LF on biofilm formation by Escherichia coli and Staphylococcus aureus.
Aizawa, Fabrication of chelate-setting hydroxyapatite cements from four kinds of commercially-available powder with various shape and crystallinity and their mechanical property, J.
Willcox, Synergic antistaphylococcal properties of lactoferrin and lysozyme, J.
Plaut, Human milk lactoferrin inactivates two putative colonization factors expressed by Haemophilus influenzae, Proc.
Vogel, Lactoferricin: a lactoferrin-derived peptide with antimicrobial, antiviral, antitumor and immunological properties, Cell.
Online since: June 2014
Authors: Elizabeth Refugio-García, Enrique Rocha-Rangel, Mario Romero-Romo, Eduardo Terres-Rojo, Jessica Osorio-Ramos
Prior to mechanical assessment, the optimum grinding time was determined, namely, where the smaller particle size was generated (PET–420mm and Zn-5mm), that was 3 h.
Recently, it has increased the proportion of metallic charge into polymers to improve their mechanical properties, from just 5% in the early nineties to about 60% in this new century, to produce advanced composite materials with improved properties [6-8].
Concerning the PET (Polyethylene terephthalate) waste bottles, these happen to constitute a truly grave pollution problem affecting water bodies and ground; Ecoce, a Mexican organization that gathers wastes from the main companies that generate PET bottles, has stated that in 2006 their members only recycled 20% of the plastic sent to the market [9].
This clearly follows from the fact that the zinc particle (round shape) size has a maximum of 5 μm, which is much smaller than that of the rPET fragments, which had a maximum of 420 μm and with irregular shapes, a size factor difference of about 80.
However, other properties will be studied and evaluated, and the micrographs reviewed in order to choose the best material between the PEZI1012 and PEZI3012 samples, because so far, both of them appeared to be the best.
Online since: August 2010
Authors: Tian Chen
In the early stage of design, many factors of the downstream design, such as manufacturability, assembling and quality assurance, can not be fully considered[1].
It allows geometry, properties, operations or their group parameterized and packing.
Inline node allows to import a virtual model in a VRML space originally existing in an another virtual space, while retaining all the properties of the model itself.
Appearance { exposedField SFNode material NULL exposedField SFNode texture NULL exposedField SFNode textureTransform NULL } Virtual prototyping system of pump uses Appearance nodes to package material field which contains Material nodes, defines the material of pump parts, and describe the reflective properties of pump parts.
Conclusions To develop a new product need to consider many factors.
Online since: January 2013
Authors: Gwo Chung Tsai, Kuo Yi Huang
They can reduce 10% of the wheel rim weight and didn’t affect its functions.
The angle of the applied equivalent load can significantly affect the results.
The material properties of the aluminum alloy are the following: Young’s modulus is 71000Mpa, Poisson’s ratio is 0.33, density is 2.77E-6 kg/m^3, the yielding strength is 280 Mpa, the ultimate strength is 310 Mpa, the tangent modulus is 338 Mpa.
The material properties is a nonlinear elasto-platic material shown in Figure 2.
The highest participation factor value will be the main response frequency.
Online since: December 2011
Authors: Yun Lin Luo, Hong Qiang Sun
But test results always are affected by various interference factors and we gain not good control precision in the operation process of actual computer control system.
The top two classes is uncertain environmental factors or external disturbance, the third belongs to uncertain model factors or internal disturbances.
The preparation value of v(k) and n(k) in sampling time is unknown, but their statistical properties can be obtained by observing the data.
Here we assume that they are all weak stationary random process, namely their statistical properties is certain.
Theoretically stationary random sequence v(k) can be generated by white noise sequence w(k) through a forming filter, so that stationary random interference affecting control system can be equivalent to interference of white noise acting on system by forming filter, which brings great convenience to analyze and realize control system under random interference.
Online since: January 2014
Authors: Jian Jun Wang, Ya Jun Wang, Chang Ying Guo
Model building.Three-dimensional model were used in numerical calculation, the following factors were considered in meshing the model as follows: i)Mesh size should not be too large, otherwise the high frequency part of the fluctuation pass difficultly; ii) To compare the calculation results with the test results conveniently, try to make the calculation model for grid node correspond to model test of measuring points; ⅲ) Incorporating the computation time and storage space, not only original cavern model but also reinforced cavern was divided into 76,376 three-dimensional entity elements, 83,965 grid nodes.
Deformation modulus(0.4 Gpa)of rock mass firstly needed to be convert as follows Eq. 3: (3) Table 1 Physical and mechanical parameters of the test model material Parameters Unit Numerical density kg/m3 1800 bulk modulus Mpa 2..67×102 shear modulus Mpa 1.6×102 cohesion Mpa 2.0×102 angle of internal friction ° 58 poisson's ratio 0.25 tensile strength Mpa 3.0×102 ii) Bolt parameters.
Anchor’s properties were described by one dimensional structural unit.
In the initial stage of explosion, compressive stress in vault with dark areas was bigger but tensile stress affected in smaller range on arch foot, side walls and both sides of floor were small.
With the passage of time, the range affected by tensile stress in vault gradually expanded, but the range affected by compressive stress in arch foot decreased.
Online since: January 2014
Authors: Yu Zhang, Zhong Jun Fu, Hui Fang Liu
For the complex components, often use the MNF neutral files or macros generated method. 1) With Stretching method, at first we need to determine the tensile axis, and then define section radius, cell size and material properties etc.
After definite the grid material properties, the thickness of the shell element and calculation of modal number we can import the flexible body.
Define the material properties of components.
For the reliability study of picking manipulator fetching model, main influencing factors are tomatoes center of mass for the location of the finger which effect on the distribution of fingers section of flexible body force that affects normal fetching.
From figure 3d, 3e, 3f, we can see that, due to factors such as the shape of the tomato and mass center position, the tomato was fixed in the longitudinal only contact with finger 1 and 2 but has no contraction with finger 3.
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