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Online since: December 2016
Authors: Ichiro Shimizu
This fact implies that the texture of magnesium alloys is an important factor affecting not only on the plastic anisotropy but also on the ductility and formability with regard to the loading direction [4, 5].
Mechanical Twin during Compression.
It suggests that the mechanical twin plays important role on the occurrence of fracture.
The deformation patterns also affected on the fracture, which was apparently restrained under the equi-biaxial compression than the uniaxial compression, on both cast and extruded alloys.
Tsujimura, Mechanical properties and microstructure of AZ31 magnesium alloy during high temperature deformation, J.
Online since: May 2011
Authors: Bai Yang Lou, Bin Xu
The paraffin which coats the copper granules can change the structural properties, reduce strength and hardness, and diminish the surface force of copper granules, causing the increase of depolymerization effect and contrarily the decrease of conglobation effect.
The possible reasons are analyzed as follows: on the microscopic level, during milling process, repeated mechanical deformation may have induced many dislocations.
The face-centered cubic copper with a good plastic property is easy to deform and produces a large number of dislocations in a short time, leading to the refinement of crystal grains and the very close approach to the limit of energy conversion.
Table 1 Elongation of Thermal Expansion of Composites at 50℃ [mm] Milling Time / h Heating Time / s 20 30 40 50 20 0.92 1.13 1.29 1.39 50 1.04 1.18 1.35 1.42 80 1.14 1.28 1.41 1.42 Fig.4 Thermal sensitivity of composites with different milling time Because the difference in thermal sensitivity of composites is directly related to the coefficient of thermal conductivity, the factors affecting the thermal conductivity is discussed to explore the relationship between milling time and thermal sensitivity.
Online since: October 2013
Authors: Xu Jia, Han Jing Cui, Li Wei Zhu
Main technical parameters of white LED 1) the most important parameters of LED in the optical properties is the luminous efficiency , the ratio of light energy radiation in the input power is defined as the luminous efficiency, this value is as known as the external quantum efficiency
The working life span of LED will not be affected by the high voltage.
The human eye judgment will be severely affected in this color rendering.
The monochromatic light color drift can affect stability of white LED lighting.
The expensive price is also a factor affecting the development of white LED lighting.
Online since: November 2013
Authors: Wei Xu, Wei Xu, Jian Ming Wu, Rui Ya Xiao
Through the finite element analysis, studies on mechanical performance of prestressed steel-concrete composite beams when it is undered the low reversed cyclic loading, based on constitutive model of elastic-plastic and consider nonlinear property of materials, it indicated good agreement with the experiment.
Model building and meshing Contact and connection relationship in the process of model establishment affect the accuracy of the simulation directly.
Through the analysis, Using ABAQUS finite element software to simulate the dynamic properties of prestressed steel and concrete composite beams, and the error value within the scope of the permit.
Conclusions (1) Compared with the test results, in this paper, numerical of the simulation and experimental data have smaller deviation, constitutive relations and the error between software and test are the main factors.
Online since: August 2014
Authors: Mario de Stefano, Valentina Mariani, Maurizio Ripepe, Giorgio Lacanna, Pauline Deguy, Marco Tanganelli
Clearly the seismic vulnerability of a single building is influenced by many factors and by specific vulnerability conditions that cannot be individually evaluated.
Therefore the trend of the amplification factor should be determined so as to account for the site effect amplification.
The form collects the evaluation of all the structural parameters which may be vulnerability factors for the building in the event of an earthquake, e.g. the quality and organization of the structural system, regularity of configuration, type and rigidity of the floors, etc.
The experimental campaign aimed at the determination of the dynamic properties of the buildings pointed out that the period-height relationships provided by the NTC 2008 overestimate the experimantal periods found for the sample building database, evidencing the need to evaluate specific period-height equations for different urban environments when a reliable risk evaluation is required.
Viti, Variability in concrete mechanical properties as a source of in-plan irregularity for existing RC framed structures, Engineering Structures 59 (2014) 161-172
Online since: June 2025
Authors: M. Isya, Meidia Refiyanni, Sofyan M. Saleh, Ichvan Fadil, Sri Aprilia
The study began with testing the physical properties of aggregates and asphalt, both conventional and modified.
After testing the physical properties, the next step was determining the optimum asphalt content.
The R² value of 0.835 indicates that 83.52% of the variation is explained by the model, with the remaining 16.48% attributed to factors related to the modification of the asphalt used [24].
Kang, “Mechanical Properties of Porous Asphalt Mixtures Containing Styrene-Butadiene-Styrene and High-Viscosity Modifiers,” J.
Setyawan, “Design and properties of hot mixture porous asphalt for semi-flexible pavement applications,” J.
Online since: January 2010
Authors: Rong Di Han, Jun Zhou
The magnetic effect of cutting emulsion is concerned with some factors such as magnetic density, magnetic time, and so on.
This mainly results from improved cooling and lubricating properties of magnetized emulsion.
This indicates that cooling and lubricating properties of magnetized emulsion are certainly improved.
In dry cutting, color of the chip is filemot, and it becomes weak when using emulsion, which indicates temperature of the cutting zone is higher; When using magnetized emulsion, chip becomes white and bright, which shows that cooling and lubricating properties of magnetized emulsion is better than the cutting emulsion.
So the ability that cutting emulsion penetrates into the cutting zone affects the cooling and lubricating action of the cutting emulsion directly.
Online since: November 2010
Authors: Qi Quan Lin, Zhi Gang Wang, Wen Zheng Dong
Studies on Galling Behavior in Square Cup Drawing of High Tensile Strength Steel Lin Qi-quan1, a, Dong Wen-zheng1,b , Wang Zhi-gang2,c 1School of Mechanical Engineering, Xiangtan University, Hunan, Xiangtan,411105,China 2Department of Mechanical Engineering, Gifu University, Gifu 501-1193, Japan axtulqq@126.com, bxtu_wenzheng@163.com, czgwang@cc.gifu-u.ac.jp Keywords: High Tensile Strength Steel; Galling; drawing; DEFORM-3D; Coating Abstract: In this study, galling behavior in macro-scale is investigated in the square cup drawing of a high tensile strength steel in semi-dry and dry condition on laboratory experiments.
From the galling trace in Fig. 2, the galling seems to occur while the drawn cup is sliding after the top edge has passed through the die shoulder, and the sliding distance is possibly a dominant factor in galling.
Its properties including tensile strength and elongation, etc., as shown in Table 1, specifically the friction coefficient of workpiece-die and workpiece-punch were 0.1 and 0.12, respectively. 3.1 Comparing the drawing force between experiment and FEM simulation Fig. 7 shows the drawing force between experiment and FEM simulation.
Additional experiments with coated dies As we discussed above, the die life was seriously affected by the galling occurring on the non-coated dies, consequently, the experiments for TiC (CVD) and DLC-Si (DC -PACVD) were continued with the experimental conditions in Table 2.
Hirose:Transactions of the Japan Society of Mechanical Engineers Ser.
Online since: February 2016
Authors: Suet To, Shao Jian Zhang
Effects of axial spindle vibration on surface generation in ultra-precision diamond turning Shao Jian Zhang1, 2, a * and Suet To2, b 1Research Institute of Mechanical Manufacturing Engineering, School of Mechatronics Engineering, Nanchang University, Nanchang, Jiangxi, PR China 2State Key Laboratory in Ultra-precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, PR China aS.J.Zhang@connect.polyu.hk, bSandy.To@polyu.edu.hk Keywords: Model, Spindle vibration, Surface generation, Ultra-precision diamond turning Abstract.
The general factors include machine tool [2], cutting conditions [3], tool geometry [3], cutting heat [4, 5], material property [6], chip formation [7], tool wear [8, 9], vibration [10-12] etc.
In UPDT, ASP plays an import role in the factors influencing surface generation.
Lee, Study of factors affecting the surface quality in ultra-precision diamond turning, Mater.
Online since: January 2014
Authors: Jian Yang Li, Huang Jie Hong, Qiang Rui, Hong Yan Wang
(2) Confirmed the probability density function of random factors, and supposed all of the factors were mutually independent
(3) Each random factors created random numbers in the interval of [0,1] (1) Where is the number of variables, .
It is the most typical DOE with reasonably uniform sampling point distribution property.
Monte Carlo sampling points (a) (b) (c) (d) It can be seen from Figure 4(a) that acceleration in proportion to vertical velocity, and it is less affected by horizontal velocity.
As can be seen from the Figure 4(c), when the horizontal velocity is low, the acceleration is less affected by gradient.
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