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Mechanical Properties of Cubic SiC, GaN and AlN Thin Films Jörg Pezoldt1,a, Rolf Grieseler2,b, Thorsten Schupp3,c, Donat J.
The mechanical properties of the epitaxial layers were investigated by nanoindentation.
Compared to non-piezoelectric materials, the piezoelectricity adds an additional energy dissipation path which might affect the vibrational properties and the quality factor of the MEMS device [3].
The mechanical and dissipative properties are affected by the epitaxial layer quality, their dislocation densities and the residual stress.
The mechanical properties of 3C-SiC are mainly studied on thick epitaxial layers, but advanced applications [4] require thin films exhibiting different mechanical properties [2].

The Effect of Various Nanoclay Surface Modifications on the Thermal and Mechanical Properties of Amorphous Polyamide Nanocomposites Khairul Anwar ABDUL HALIM1,a*, James E.
This is due to the affinity between polymer matrix and nanoclay is of important factors should be considered.
The type of clay grades significantly affects the mechanical properties of the amorphous polyamide nanocomposites.
In order to achieve a good dispersion, preferably exfoliation of nanoclay platelets, the affinity between polymer matrix and nanoclay is one of the important factors should be considered.
Fig. 3: The effect of different nanoclay grades on the ultimate tensile stress and strain at break for aPA TR90 and aPA TR 90 nanocomposites The type of clay grades significantly affects the mechanical properties of the amorphous polyamide.

achendg2580@sina.com, bjinhliu@nwpu.edu.cn, cmzhbky2012@163.com, d1811028040@qq.com e494254255@qq.com Key words:7A52 Al alloy; Friction Stir Welding; microstructure; mechanical property Abstract: The7A52 aluminum alloy of the 30mm thickness was welded by the friction stir welding.
The structure and the mechanical property of the welded joint was researched by the optical microscope and SEM, etc.
Therefore, in this paper, the author selected 30 mm thickness 7A52 aluminum alloy plate for single-channel friction stir welding test, and studied its friction stir welding process and mechanical property characteristics.
Generally speaking, the ranges of heat input factors are 3 ~ 6 when welding thickness aluminum alloy, (heat input factor = rotating speed / welding speed), the ranges of the rotating speed are 300r/min ~ 600r/min, the ranges of the welding speed are 50mm/min ~ 200mm/min along the weld direction.
Fig.2 The HV hardness distribution of welding joint Detection and analysis of the mechanical properties.Tensile testing of welded joints was doing according to the GB2651-2008,the results was shown in Table 2, the mean strength of the weld joint reached 364MPa,was 85.8% of the base metal strength.

In order to improve the mechanical properties of the layer deposited by anodic oxidation of aluminium on the material EN AW-1050 H24, in the contribution was investigated the microhardness of the deposited layer as a function of the physic-chemical factors affecting in the process of anodic oxidation at the constant anodic current density J = 3 A.dm-2 in electrolyte formed by sulphuric acid and oxalic acid, with the emphasis on the influence of electrolyte temperature in the range – 1,78 °C to 45,78 °C.
In many of these applications a key role is played by the mechanical properties, wear resistance and corrosion resistance [5 - 7].
Based on the published studies on the mechanical properties of anodic oxide layers, focusing particularly on the microhardness, we can state that there is very often an emphasis on the influence of electrolyte temperature and applied current density without considering other factors.
Therefore, in this study is observed not only the influence of electrolyte temperature but also the influence of other chemical and physical factors affecting the thickness and also the mechanical properties of resulting anodic oxide films formed in the electrolyte containing sulphuric acid and oxalic acid.
In regard to the complexity of the anodizing process of aluminium and its alloys, it is necessary to monitor the temperature effect in interaction with other factors affecting at actual current density and not as the only factor influencing the observed parameter.

Study on the Mechanical Properties of the Elliptic Ultasonic Vibration Cutting Process Hua Lia, ZiYang Caob Suzhou university of science and technology , Suzhou P.R.China alihua@mail.usts.edu.cn, bdukeczy@nuaa.edu.cn Keywords: ultrasonic, elliptic vibration, cutting, mechanical property Abstract.
In this paper, the mechanical properties of the elliptic ultrasonic vibratioon cutting were proposed systemiticaly through thoretical analysis，the model of the average cutting force in the elliptic ultrasonic vibration cutting process was established.
The performance of the the properties to the machining acurracy and the surface roughness was studied through experiment.
From Fig.1 the height of the residual part Δhz can be get as follow: (3) Δhz is one of the factors affecting the theoretical roughness in precision or ultra-precision machining and its value is determined by the cutting speed, the vibration frequency and the Y direction vibration amplitud
Under the affect of these properties, the dynamic cutting force is separated, the average cutting force deceases.

For example, the composition, pH value and dissolved oxygen of culture medium affect the physiological and biochemical environment; gas-liquid interface and liquid-solid interface of culture media affect the physical and materialized environment; scattered and mixed conditions of culture system affect the hydro-mechanical environment.
Representative physical factors and their applications in steroid microbial conversion system are briefly reviewed herein.
Application of physical factors in steroid microbial conversion Steroid microbial conversion system is a complex but controllable system with multiple factors involved.
Magnetized water possesses unique physical and chemical properties that can be very different from ordinary water, including improving substance dissolving power, adjusting membrane permeability and other functions.
Enhancement of steroid microbial conversion via introduction of chemical and physical factors into reaction system.

amgj2150@126.com, bdingyutian@126.com, cjinpeipeng@hotmail.com Keywords: Al matrix composites, Whisker, Hot extrusion, Mechanical properties, Microstructure Abstract.
When the content of the reinforcement is 10%, the composites exhibit the best mechanical properties, meanwhile, it demonstrate cluster is unfavorable to the improvement of properties of materials.
Mechanical properties and fractographs.
The mechanical properties of Al matrix composites are mainly attributed to the interface bonding state and distribution of whiskers in the matrix [7,8].
That is because there are other factors that affect the strength of the composites, including the clustering and lower aspect ratio of the whisker.

This paper aims to optimize three mechanical properties such as strength, elongation, and modulus of elasticity.
However, PLA ensures good processing performance and acceptable mechanical properties through FDM production [7].
Also, most of these researches only consider one or a few response factors at a time.
An ANOVA analysis was also utilized to identify significant contributors in each mechanical property intended to be optimized. and these data were further processed to develop a topology diagram with the significant contributors as main factors.
Kafsghar et al. conducted a four (4) parameter optimization of mechanical properties [13].

High Temperature Mechanical Properties of Ti(C,N)-Co-Mo2C Cermets A.
Américo Vespucio 49, 41092 Sevilla, Spain a angela@us.es, Keywords: cermets, carbonitrides, pressureless sintering, high temperature mechanical properties, creep.
This means that besides improving the toughness of the Ti(C,N)-based cermets, which is still a major goal nowadays, their resistance to plastic deformation and high temperature mechanical properties needs to be extensively investigated.
A key aspect to achieve high mechanical performance and good mechanical properties is to control the ceramic-metal bond during sintering.
These factors can be controlled by the synthesis method.

A two-factor design was then applied to determine the two factors that influenced the PA6 fatigue displacement the most, with analysis of variance being used to determine how the factors affected the fatigue property.
Analysis of variance (ANOVA) was used to determine how the factors affected the fatigue.
Zoalfakarb, Mechanical properties of glass fiber reinforced polyester composites, Int.
Özdemir, Experimental investigation of the effect of glass fibres on the mechanical properties of polypropylene (PP) and polyamide 6 (PA6) plastics, Mater.
Quaiyyum, Mechanical properties of polypropylene composites: A review, J.