Search results

The mechanical properties of Al-Si alloys highly relates to the shape, size and distribution of Si phase and aluminum phase in the alloys.
However, few researches have been done up to date on how Lorentz force affects the properties of Al-Si alloys during the electromagnetic stirring of the molten alloy according to the related literatures, thus, it is worthy of our investigation.
Herein, the role of Lorentz force in deciding the microstructure and properties of Al-Si alloys have been discussed on the basis of experiment results.
Fig.1 the movement of alloy melts in the furnace under the electromagnetic stirring Influence of electromagnetic stirring on microstructure and mechanic properties of Al-Si Alloy.
The homogeneousness and spheroidization of Si phase and aluminum phase is found to be strongly dependent on the Lorentz force, and different microstructure result in the different mechanic properties of Al-Si alloys.

Compounds in red ginger entering into the main polymer chain will affect the thickness, tensile strength, elongation, Young's modulus, and WVTR so that the physical and mechanical properties of the edible film are getting better.
Then the addition of glycerol participates in improving the physical and mechanical properties of making edible films from potato starch.
Similar studies observed changes in mechanical properties when glycerol was added (Vlacha, et al., 2016).
Influence of Chitosan Concentration on Mechanical and Barrier Properties of Corn Starch/Chitosan Films.
Effects of Cinnamon Essential Oil on The Physical, Mechanical, Structural, and Thermal Properties of Cassava Starch-Based Edible Films.

If analyzed by artificial neural network technology[4～6], material fatigue damage affected by various factors is unstable, and the relation among transient damage, material property and load stress is complicated and nonlinear mapping.
Fatigue design also tends to develop based on the original design, accumulating data, considering the real complex conditions such as structures interacting, stress concentration factors considered, load model influence and material property parameters under stress conditions, etc. for the application and simulation of reliability design.
Safety factors 2 and 20 are selected respectively on the basis of theoretical stress amplitude and cycle index, the lower of which is used to design the fatigue curve and its curve cycle index N is 10～105 cycles.
Frequency of operation and shutdown is mostly regarded as cycle index of design calculation standards without consideration of environmental factors.
Because of computation factors the sudden natural loads have long been simplified greatly leading to rough results, and disastrous accidents occur frequently.

It is presented that not only blaze angle but apex angle affect diffraction efficiency.
Blaze angle is regarded as a decided factor for diffraction efficiency which corresponds to blaze wavelength one to one [5,6].
Blaze angle is the major factor of diffraction efficiency that decides the distribution of major energy, but another parameter of triangle groove grating, apex angle also affects diffraction efficiency to extent, both blaze angle and apex angle decides diffraction efficiency at the same time.
Electromagnetic theory of gratings Because of taking into account the vectorial property of light, electromagnetic theory of gratings is more suitable to design diffraction gratings in magnitude of wavelength than scalar diffraction theory.
Beijing: Mechanical industry press. 1986.

At present, the finite element analysis has been an effective method to study the mechanical properties of steel bar drawing.
In order to study the influence of adhesive bond strength of chemically-bonded rebar mechanical properties, the constitutive relation of the bonded rebar slip of test results was referenced.
Introduction The chemical anchorage reinforcement is widely applied in technology of post anchor connection technology, existing research capacity and mechanical properties of the steel bar were mostly limited to the experimental study on single bar drawing.
At present, the finite-element analysis has been an effective method to study the mechanical properties of the steel bar drawing.
Affected by the stress redistribution, the stress concentration was developed from shallow to deep along the bond depth.

Thermal analysis study on packaging materials of Power-LED LIU Yi-Bing Mechanical and electric department, Shao yang vocational &technical college, Shao yang, Hunan 422000, China Keywords: power-LED, ANSYS, bonding materials, substrate material Abstract: In this paper, a high power- LED package model has been built.
Fig 1：The internal structure and cooling channel of power type LED According to the theory of heat transfer, the material properties relating to thermal analysis include: thermal conductivity, specific heat capacity, enthalpy, heat transfer coefficient, radiation coefficient, heat density.
For the finite element division, taking into account the convection heat transfer between the outer surface of the device and the surrounding air, the convective heat transfer coefficient h is a constant (in the calculation of the value of 5W/m2k), set the boundary conditions for: In the transient process, system temperature, heat flux, boundary conditions may change over time; transient balance in matrix form is expressed as: The matrix elements are: In which - In the unit time in the unit volume the heat source heat of formation, - is vertical to the superficial heat flow, - respectively be the boundary and the environment temperature, - the specific heat matrix, - the unit node temperature the vector which causes to the time, - the conduction matrix, including the thermal conductivity, the counter-flow coefficient, the emissivity and the form factor, - the unit node temperature vector, - the node flow rate of heat vector, including the heat of formation, is the unit
Power- LED FEM thermal analysis on bonding materials Die bonding materials is an important factor affecting the power type LED thermal conductivity properties, if not handled properly, it will make LED thermal resistance too large, leading to a high junction temperature under the rated operating conditions, a decrease of the device optical efficiency and lower reliability [1].
Finite element analysis on power- LED package substratematerials Power-LED substrate materials is an important factor affecting the characteristics of the thermal conductivity, and the radiating substrate materials must have high electrical insulation properties, high stability, high thermal conductivity, coefficient of thermal expansion similar to the chip as well as the smoothness and high strength [2].

The thermal properties of PA6/C20A nanocomposite were characterized from thermal gravimetric analysis.
The physical and chemical properties of PA6 and nanoclay C20A are presented in Table 1 and Fig. 1 respectively.
Giannelis., Synthesis and properties of two-dimensional nanostructures by direct intercalation of polymer melts in layered silicates.
Banerjee, Polymer/montmorillonite nanocomposites with improved thermal properties Part I.
Factors influencing thermal stability and mechanisms of thermal stability improvement.

The investigation is made into the types of such implant-oriented materials that are best featured for their bonding properties.
The purpose of the present investigation is to identify a polyethylene coating method that would make it possible to produce still more durable coatings, to clarify what materials suitable for implant production are featured for their best bonding with polyethylene properties, to set up a rational number of layers made up of different materials and to determine the impact of surface roughness on tribological properties of the implant.
The primary visual analysis leads to the conclusion that Co+TiO2 and Co-Cr-Mo coatings presented in b and e photographs of Fig. 3 are least affected.
Ramani: Macro polyethylene/titanium alloy composite for use in a constrained knee prosthesis (Advanced materials - development, characterization processing, and mechanical behavior.
Proceedings, ASME International Mechanical Engineering Congress and Exposition, 1722 Nov. 1996, Atlanta, GA.

In addition, for the majority of the organic polymeric materials, their excellent mechanical properties under laboratory conditions deteriorate rapidly under the corrosive or aggressive environmental conditions.
Obviously PET thin film here plays a role of functional layer for corrosion resistance by fully exploiting the excellent anti-corrosion properties of pure aluminum material.
Conclusions A composite structure, which consists of a fabricated composite with high anti-corrosion properties and stainless steel thin film / sheet, is manufactured in this work.
The properties of such a structure have the combination of the high tensile strength, low mass density of the composite, and the high stiffness of stainless steel material.
The corrosion products and mechanical properties of certain light aluminum alloys as affected by atmospheric exposure, Proceedings of the Physical Society of London, Vol.30 (1926) 15-25

Research of Denoising Technology about Wavelet Analysis with Wiener Filter Hu Yaobin1,a, Hu Liangbin1,b, Cheng Qiang1,c 1School of Mechanical Engineering, University of South China, Hengyang China ahyb116@sina.com, bhuliangbin83@sina.com, cchengqiang1989@126.com Keywords: wavelet analysis; wiener filter; power line noise; denoising process Abstract.
Interfering noise of power line is one of the important factors which affects the quality of power line communication (PLC).
(2) The whitening effect of wavelet transform depends on the orthogonal properties of the wavelet function.
Measurement Information Signal Analysis in Mechanical Engineering[M].