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Moreover, he stated that the mechanical properties are affected by the weight percentage of the sand particles in the composite, as well as the size of the sand particles: the finer the sand size, the higher the strength will be.
The thermal and mechanical properties of epoxy composites reinforced by natural hydrophobic sand were investigated by G.
Their research also showed that Cancun sand has the potential for applications in cost-effective composites with enhanced mechanical and thermal properties.
The experimental observations of the mechanical properties of the samples will be compared against the numerical results obtained from ANSYS software.
Huo, Thermal and Mechanical Properties of Epoxy Composites Reinforced by a Natural Hydrophobic Sand, Journal of Applied Polymer Science, Vol. 109, 247–255 (2008).

Strength is very important for material’s properties.
Materials’ properties are generally affected by many factors with different influences.
Therefore, in materials’ design and development, it’s necessary to make comparative analyses to find factors crucial for materials’ properties and control the factors in order to ensure high material properties [4].
And beyond that, model making may be disturbed by various accidental factors in which case model quality will be affected somewhat inevitably [5].
[3] Li Changhua: Properties and Usage of Carbon Fiber.

Microstructural characteristics and creep properties of Mg-5Al-2Si alloys modified with Sn and Sr D.
However, its application is limited to temperature below 120°C due to their rapid degradation of mechanical properties; especially the poor creep resistance attributing to the thermally unstable β phase (Mg17Al12) at elevated temperature [6].
However, the processing of magnesium alloys containing Si is limited to die-casting due to the formation of coarse Chinese script Mg2Si phase, which forms under slow cooling conditions and is quite detrimental to the mechanical properties.
Therefore the modification of Mg2Si particle morphology is needed to obtain the sound mechanical properties.
It can be seen that Sn and Sr addition to the alloy resulted in improving creep properties, and creep properties improved further with increasing the content of Sn.

Product quality depends on a great variety of factors.
In order to choose basic factors and take into consideration their affect on physical, mechanical, and exploitation properties system analysis can be used.
In order to predict properties of the product it is necessary to take into consideration the affect of technological parameters on semiproduct properties change during the whole technological cycle.
The main aim of the technological process is to obtain the coating with definite level of exploitation properties appropriate to exposure factors.
Hence, it is important to state the relations between basic factors which affect on the coating formation and their physical and chemical properties.

- In the case of medium-carbon micro-alloyed steels for cold forming, the reduced PAGS achieved by means of thermo-mechanically controlled process reflects on a closer control of as-rolled mechanical properties, avoiding hardness hot spots asking for annealing treatments before cold forming.
Several researchers [3-7] pointed out that the main microstructural parameters affecting the deformation behaviour of fully pearlitic steel are the pearlite interlamellar spacing (λ), the pearlite nodule and colony sizes, and the prior austenite grain size (PAGS).
Mechanical properties of MC-B steel in tension and in compression
F P hard spot Conclusions The influence of main microstructural features (pearlite interlamellar spacing, PAGS) on the mechanical properties of some current steel wire rod grades were studied in order to evaluate the opportunities offered by thermomechanical rolling.
The reduced PAGS has a more direct influence on the mechanical properties of medium-carbon micro-alloyed steels for cold forming both in compression and tension regime because the ferrite grain size is strongly related to PAGS.

Many Factors influencing the testing accuracy are discussed according to the differences between the testing data of most of the domestic anti- force rolling brake testing platform.
We try to get the theoretical analysis and be proved by experiment through the mechanical model.
Finding the factors influencing the testing accuracy of anti-force rolling brake testing platform is significative to improve the authenticity and accuracy.
Conclusion In the view of the influence factors of the accuracy of measurement of anti- force rolling brake testing platform, mainly from the adhesion coefficient, the tire pressure, the displacement of the rear wheel, direction of deflection in four aspects，and expanding influence factors measurement under the condition of car braking force, by the braking curve, compare it with the braking curve under normal situation to prove the vehicle state changes affect the precision of anti- force rolling brake testing platform.
The Factors Influencing the Testing Accuracy of the Anti- force Rolling Brake Testing Platform: Agricultural Equipment & Vehicle Engineering,2007(4) , p.36-38.

In this work the effect of various parameters on the mechanical properties viz. tensile strength and impact strength were studied.
Both the alloys have very good mechanical properties.
These three factors are varied at three levels for two tools.
So conducting one experiment at a time for three factors at three levels give 27 experiments if full factorial design is considered.
This proves that pin profile along with dimensions also plays an important role in determining the mechanical properties of the welded joint.

For the factors selected in the simulations, short-shot size was found to be the principal parameters affecting the water penetration length while melt temperature, mold temperature, water temperature, water pressure were found to have little effect on the penetration of water.
In their experiments, short-shot size, water injection delay time and water injection pressure were found to be the principal parameters affecting the manufacturing of water-assisted injection.
Gi and Si are given by , And material properties here are the weighted average values of the materials properties in layer i.
The material used is polypropylene (Taiwan PP 366) and its properties listed in Table 1.
The influence of processing conditions, such as short-shot size, melt temperature, mold temperature, water temperature and water pressure, on the penetration of water into polymer melt were studied here and found that short-shot size is the most significant factor affecting the water penetration while other parameters such as melt temperature, mold temperature, water temperature and water pressure have little effect on the length of water penetration and the thickness fraction of water penetration.

The material properties are defined as follows, density: ρ=7860kg/m3, modulus of elasticity: E=2.06×1011Pa, Poisson's ratio: ν=0.3, friction coefficient: µ=0.2.
It can be seen clearly that the major influencing factors on the contact area of the flange face isn’t clamping force.
In contrast, spindle speed is the major factor affecting the contact area on flange face.
China Mechanical Engineering, 2004, 15(5):391-394
Chinese Journal of Mechanical Engineering, 2004, 40(2):83-86

FATIGUE CRACK GROWTH BEHAVIOR OF A GAS PRESSURE WELDED PART OF RAIL STEEL UNDER MIXED MODE LOADING Chul-Su Kim 1,a and Jung-Kyu Kim 2,b 1 Department of Rolling Stocks Mechanical Engineering, Korea National Railroad College, Wolam -Dong, Uiwang-Si, Gyeonggi-Do, 437-763, Korea 2 School of Mechanical Engineering, Hanyang University, Seoul, 133-791, Korea a chalskim@paran.com, bkimj@hanyang.ac.kr Keywords: Comparative Stress Intensity Factor Range, Gas Pressure Welded Part, Rail Steel, Mixed Mode Loading, Transverse Crack Abstract.
In this study, the fatigue crack growth behavior under the mixed mode was discussed by using comparative stress intensity factor ranges proposed by Richard.
The mechanical properties of the base metal and the welded part of rail steel were summarized in Table 1.
Table 1 Mechanical properties Yield strength (MPa) Tensile strength (MPa) Elong ation (%) Fracture toughness CK (MPa) Base metal 481 887 14.5 46.6 Welded part 545 936 9.65 43.3 Heat affected zone SLT SLT Heat affected zone Fig. 1 Position and orientation of test specimens The FCG test using the CT specimen under mode I (tensile mode) was performed at different stress ratios R according to ASTM E647-95a.
max max min eff op V V V V V V K K K U K K K ∆ − = = ∆ − (1) where max VK and min VK are maximum and minimum comparative stress intensity factors, respectively, and op VK denotes comparative stress intensity factor which is calculated from the Pop.