Search results

Both temperature and strain rate are important factors affecting the deformation behavior.
Introduction Ti-6Al-4V alloy, a two-phase alloy, is widely used in the aircraft manufacturing, ship building and defence field for its many advantages such as low density and excellent mechanical and corrosion resistant properties.
The working processes of Ti-6Al-4V alloy, in order to optimize its mechanical properties and formability, has been the focus of research.
Controlling of morphology and size of theαphase is known as one of the most important keys to improve the properties.
All of the curves illustrate a flow softening behavior which is affected by temperature and strain rate.

Introduction Vibration problems exist widely in engineering practice, factors such as earthquakes, wind load, mechanical high speed operation, etc will lead to different degrees of building structure vibration.
Principles and mechanical properties of fluid viscous damper Structure and energy dissipation principle of rod type viscous fluid damper.
Therefore, the discussion of the vibration properties of energy dissipation structure is required to establish realistic mechanical model.
Therefore, “can damping force be larger” is affected by supporting stiffness K.
Therefore, the phase of damping force and velocity is affected by supporting stiffness K.

The used wheel is a kind of complex anisotropic materials with heterogeneous phases, and the material’s properties at each points in the wheel vary with temperature.
Thermal and physical properties of bronze and diamond [6] Properties Material Bronze Diamond Density ρ/(kg·m-3) Thermal conductivity λ/(W·m-1·K-1) Specific heat С/(J·kg-1·K-1) Melting point T0/(K) Latent heat of vaporization T1/(K) absorptivity А（YAG laser） 8620 41.9 352 1173 2770 0.38 3515 2000 1827 ---- 3973 0.20 The metal-bonded diamond wheels (1A1 /T2 150× 10×32×5MBD 70/80) were adopted in the experiments, and the bronze bond was used.
Table 2 lists the thermal and physical properties of the bond and the thermophysical characteristics of the diamond abrasives.
Thus, it can be concluded that, without regard to the effects induced by the measuring error of experimental instrument, as long as the finite element meshes can be appropriately generated during the simulation modeling, various influencing factors of temperature field can be accurately dealt with.
Chinese Journal of Mechanical Engineering, 2007, 43(7):93-98

Fig.1 Thin-wall product drawing Table.1 Properties of the Marlex AGN-650 Recommended injection temperature /℃{TTP}8451 Recommended mold temperature /℃{TTP}8451 Melt temperature /℃{TTP}8451 The lowest melt temperature /℃{TTP}8451 The highest melt temperature /℃{TTP}8451 Melt index /g/10min 116 40 225 190 260 65 The software is MOLDFLOW MPI6.1 which used in experiments, select fusion mesh to divide mesh.
Table.2 Properties of the injection machine Equipment Type Maximum clamping force /ton Maximum injection volume /g Maximum injection rate /g/cm3 Screw diameter /mm HTL1200 1200 6193 1024 125 Experimental Design As the thin-wall plastic part is an appearance product, warping will seriously affect the visual quality of plastic parts; moreover, it will affect the overall performance of plastic parts, so the research of warping has large practical value.
Table.3 Experimental factors and levels Experimental level Experimental factors Mold temperature A/℃{TTP}8451 Melt temperature B/℃{TTP}8451 Holding pressure C/% 1 40 220 70 2 50 240 80 3 60 260 90 This orthogonal experiment is 3 factors and 3 levels, if a comprehensive test of all the different combinations; you need to be = 27 different experiments, so it is more complicated experiment.
Experimental factors Results A B C Warpage /mm 1 40 220 70 4.015 2 40 240 80 3.645 3 40 260 90 3.361 4 50 220 80 3.507 5 50 240 90 3.921 6 50 260 70 3.703 7 60 220 90 3.891 8 60 240 70 3.891 9 60 260 80 3.530 In order to get influence degree of this test factors indicator, need to analyze the range of orthogonal experiment.
The greater the difference R, indicating that the factor can greater affect the index, the range analysis results of various factors is shown in Table. 5.

High level of gas contents, especially oxygen and nitrogen, would seriously affect the mechanical properties of TiAl products.
Maziasz, Microstructural control and mechanical properties of dual-phase TiAl alloys, J.
Tian, et al, Effect of Yttrium on Microstructure and Mechanical Properties of Ti-43Al-9V Alloy, J.
Influence of yttrium on microstructure, mechanical properties and deformability of Ti-43Al-9V alloy[J].
Wang, et al, Microstructures and mechanical properties of hot-pack rolled Ti-43Al-9V-Y alloy sheet, J.

Material properties, calculation models and parameters are the main factors affect the simulation results of concrete face rockfill dams.
It affects construction quality, durability, operation, and security of the projects[1-2].
By taking into account the influence of rockfill rheological property on stress-strain analysis and safety of CFRD, the constitutive model parameters were obtained by the triaxial test indoor proceed by Shen Zhujiang etc..
R., Back analysis of mechanical parameters of naturally graded rockfill materials based on large-scale loading plate tests, Chinese Journal of Geotechnical Engineering, 31 (6)(2009) 155-160

Using SHEEL element, the FEA model of the support structure is established, the property of the components is listed in table 1.
Analysis of the influence factors on support structure mode Table 4 Orthogonal experiment table of support structure and analysis results of first-order mode Factors Mode freq.(1st order) experiments A B C 1 1 1 1 156.35 2 1 2 2 182.81 3 1 3 3 220.63 4 2 1 2 156.20 5 2 2 3 217.38 6 2 3 1 155.79 7 3 1 3 208.91 8 3 2 3 156.75 9 3 3 2 176.29 For change in structure can affect the mode frequency of structure, DOE analysis is designed to find which member has the smallest effect on it.
Taking the brackets of support structure of the dynamic systems as object, an orthogonal table of three factors and three levels is designed.
The element section of the finite is set to 20 * 30, 30 * 30 and 30 * 40 as three levels, while the links along X, Y, Z three directions is set as three factors A, B, C to make an orthogonal table.
From table 5, it is known that the main influence factor on the first-order mode of the support structure is factors C, the secondary one is factor A.

Optimized Pressure Determined in Accordance with Variable Plunger Stroke of Internal Injector NGV Kwonse Kim1, a, Dooseuk Choi2,b* 1Department of Mechanical Engineering, Graduate School, Kongju National University, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan-si, Chungcheongnam-do, 31080, Korea 2Division of Mechanical & Automotive Engineering, Kongju National University, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan-si, Chungcheongnam-do, 31080, Korea akimkwonse@kongju.ac.kr, bdschoi@kongju.ac.kr Keywords: Injector, NGV (Natural gas vehicle), Plunger stroke, Bi-fuel system Abstract.
The mass flow value matched the conditions under the assumption of the experiment conditions and equal environments after selecting the properties.
The model selected was an injector type (subscript 2) model, and in order to achieve the analysis result, the program was set up with the condition to extract characteristics regarding the main factors of pressure and velocity.
Table 3 Properties of analytic conditions Subsections Conditions Mass flow rates ž 0.078 kg/min ž 0.204 kg/min ž 0.318 kg/min Stroke range ž From 0.025 mm to 0.2 mm with 0.025 mm unit Fuel ž Methane (CH4) Temperature ž At 25℃ Injector type ž Commercial subscript 2 Factors ž Pressure ž Velocity Analytic results and discussions Figure 3 shows the result of decreasing pressure according to plunger stroke with the minimum mass flow at the inlet of an NGV injector, and analysed the result after being set to 10 bar.
The chocking phenomenon did not exist at an interrupted factor below a plunger stroke of 0.175 mm.

Our team has been investigating the forging of thixomolded magnesium bodies in order to improve their mechanical properties so that the application of thixomolded magnesium parts in the transportation industry can be expanded.
Although it is expected that the mechanical properties of a forged thixomolded magnesium alloy are affected by the existence of the coarse alpha grains, its microstructure evolution during forging process has not yet been clarified.
The mechanical properties of thixomolded components are equal to or higher than those of die-cast components, since the high cooling rate due to the lower shot temperature makes for a finer microstructure [1].
In order to improve the mechanical properties of thixomolded magnesium parts, we intend to apply a forging technique to the molded parts.
In particular, we are interested in the microstructural behavior of coarse alpha grains, which are the result of semi-solid molding [2-3] during the forging process, because the alpha grains are expected to affect the mechanical properties [4].

The mechanical faults change the dynamic properties of the machine tool system, which affect the quality of the workpiece.
However, extensive machining experiences have demonstrated that, the geometric quality of the workpiece is not only determined by the designed tool path, but also affected by other factors such as machine tool structural dynamics, cutting process dynamics and fixture error.
From Eq.(7), it can be seen that the relative displacement of the tool-workpiece system X(s) affects the quality of the product Z(s) largely.
The mechanical faults change the dynamic properties of the machine tool system, which affect the quality of the workpiece.
Gao and Z.S.Zhang, Fault diagnosis principles of non-stationary signal and applications to mechanical equipment, High Education Press, Beijing, 2001, pp1-2