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The iron intermetallic phase has the greatest influence on mechanical properties.
Long and brittle Al5FeSi platelets (more than 500 µm) can adversely affect mechanical properties, especially ductility, and also lead to the formation of excessive shrinkage porosity defects in castings.
These intermetallic compounds are hard and can adversely affect the overall properties of the casting.
The influence of intermetallic phases to mechanical and fatigue properties depends on size, volume and morphology of these phases [11].
This form is considered less harmful to the mechanical properties than Al5FeSi needles.

The performance of automobile drive axle housing structure affects whether the automobile design is successful or not.
So the performance of automobile drive axle housing structure affects whether the automobile design is successful or not.
When builting the drive axle housing geometric model, the axle housing structure has been simplified based on it’s structure and operating characteristics, while maintaining its mechanical properties [2]: (1)In order to simplify modeling and extract middle section in the process of building finite element model and mesh generation based on shell element, the fillet angles of the drive axle housing is simplified to the right one
The number of mesh will affect the calculation accuracy and the scale.
So before determining the number of mesh , we should weigh these two factors.

Usually these efforts involve active and passive methods such as extending the heat exchanger surface area or use such fluid those have high thermophysical properties, and can create turbulence.
They suggested that the base fluid with nanoparticles contribute to the positive affect on heat transport properties.
The thermophysical properties of nanoparticle and water were taken from literature [10] for 300 K temperature.
Density and viscosity have an indicative effect on Reynolds number among all these factors.
Ijam, Investigating the heat transfer performance and thermophysical properties of nanofluids in a circular micro-channel, Int.

The results show that the vibration characteristics were affected by the sandwich structure configuration and material properties.
By determining the damping properties of structures, the vibration and movement of structures can be controlled.
Very little published data exist on the vibration loss or resistance factors of composite sandwich plates.
The polymer columns rigidly joined the top and bottom face sheets of the plates and increase the resistance of the face sheets de-bonding from the core, thus increasing the mechanical properties of the interface between the foam-core and the face sheets.
It can be seen from Fig. 3 that different damping properties were obtained for different column diameters.

Introduction Laser beam,electron beam and plasma beam，all being high energy density beam with the properties of high energy density and the strong penetrating, have been widely used in the field of metal surface modification [1].
Using this technique for surface modification on metallic materials can significantly improve the mechanical properties of materials.
Plasma arc surface hardening heat treatment process involves many factors, the operating current, scan speed, nozzle workpiece spacing, nozzle diameter, the working gas flow, electrode shrinkage, electrode shape, electrode and nozzle concentricity and other factors will all affect the results of the surface hardening.
Divide the three factors into three levels, using the orthogonal diagram L9(33), we get orthogonal experimental table and the experimental results that shown in Table 2.
In the Table3, HI means the sub of the test index what corresponding with every factor. i=1,2,3…HR(DR)=max Hi(Di)-min Hi(Di) Factors Indexes Table 3 Orthogonal analysis Operating Current Scanning Speed Workpiece nozzle Spacing (A) (m/min) (mm) The hardness of the Hardened layer H1 H2 H3 HR 2042.3 2167 2280.5 238.2 2279.9 2136.5 2130.4 149.5 2140.1 2282.7 2053 229.7 Depth of the hardened layer D1 H2 D3 DR 0.53 0.65 0.61 0.12 0.73 0.58 0.48 0.25 0.61 0.60 0.58 0.03 the current value affect to the hardened layer.

The optimal particle size fraction of coir fibres with respect to good final mechanical properties is in the range between 0,5 and 2 mm.
The moisture content in the natural fibres is one of the critical factors that have a strong impact on the interphase quality because of releasing of the water evaporated by the high processing temperatures.
Fig. 8: Printed specimen on 3D printer Easy3DMaker Tab. 2: Parameters settings for 3D printer Easy3DMaker Mechanical properties In order to evaluate the mechanical properties of created specimens the tensile tests were carried out in the laboratory of Technical University of Liberec.
The presence of natural fibres significantly improved the mechanical properties of the tested specimens.
The natural fibre presence in the composite has also a strong impact on the final physical and mechanical properties.

As a result, the load-deflection properties measured during real testing were very different from those anticipated by the spring equation.
Utilizing mass for improved spring properties and high cyclic strength.
The following factors were taken into account when creating the Belleville spring are; the material type, the thickness of the sheet metal and the details or dimensions of the Belleville spring.
This spring steel is already heat treated, which is used in spiral spring of the sliding doors of shops as shown in Fig. 4, and the tested mechanical properties conducted in the General Company for Engineering Inspection and Qualification are listed in Table 3.
The tested mechanical properties of the sheet metal.

Table 1 Different catalysts affect high-efficiency modified alkyd resins properties catalyst Reaction temperature Reaction time Acid value mobility（%） NaOH 220 4 24 5 KOH 220 4 22.8 3 CaO 220 4 8.8 1.5 Ni(OH)2 220 3.5 6.3 1.3 Table 1 shows that CaO, Ni(OH)2 for catalyst reaction has good catalytic activity.
Table 2 Temperature of esterification affect modified alkyd resins properties Reaction temperature Acid value facade Anchoring strength chroma value 200 16.8 Pale yellow 3 4 210 13.6 yellowtransparent 2 4 220 6.3 ambertransparent 1 8 230 5.8 amber translucent 1 10 240 5.4 amber translucent 1 12 From the Table 2, the product acid value drops higher with reaction temperature increasing, adhesion strength, at the same time they have increased the enhancement of product of chromaticity.
Oil degrees the proportion of fatty acid and polyester said the size of the value is one of the key factors of high-efficiency modified alkyd resin efficiency.
The degree of oil is longer, resin contained more, et cetera did better properties, but at the same time because resin molecules in relative reaction functional groups, surface long reduce tacky.
A combination of factors, finally choosing 55% oil degrees preparation non-drying alkyd resin, the effect is good.

Mica can improve products electrical properties, heat resistance, cracking resistance and moisture resistance, and in the liquid resin system has good resistance to caking property.
Quartz powder has low thermal expansion and good electrical insulation properties, can improve the dimensional stability and thermal conductivity of the products, improve the dielectric properties of.
In the actual choice of initiator, should consider the following factors; resin mixture in the mold of liquidity, applicable period, responsiveness, product appearance and gloss, monomer residues and products of physical and mechanical properties.
Choose the appropriate color, but also play to improve the product durability, mechanical strength and optical properties of other benefits.     
Conclusion Choice of packing should be considered when the products performance, molding process and cost of several factors.

In this paper, a under-construction suspension bridge with span of 1688m is taken as a case-study, Comparative analyses are performed mainly focusing on basic parameters, carrying efficiency of main cable, static behavior and dynamic properties as different high strength cable are adopted in this suspension bridge.
Where = sectional area of main cable; f = sag of cable; l = span of suspension bridge; = allowable stress of cable materials; = increasing coefficient considering the dead weight of protective layer of main cable, hangers, cable clamp and other factors(=1.1 in this study) ; =unit weight of cable materials; = dead weight of stiffened girder, pavement, auxiliary facilities, etc.; =live load.
Distribution of vertical deflection of under live loads stiffened girder under live loads Analysis on the dynamic properties A comparative analysis on dynamic characteristic of NZCB with two types of main cable was performed by using aforementioned FEM model.
This shows that the girder-dominated vibration mode is less affected by main cable, but the cable-involved vibration mode is affected greatly.
[7] S.J.Sun, Study on mechanical properties of the super-span suspension bridge with CFRP cables, Changan University, Xian, China, 2013, pp. 52-68