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Qiang Liu and some other people also have done some research on Mechanical Properties [5][6][7] .
By analyzing the formula (8), we can find many factors that influence the speed after hitting such as m , ballv , batv , P ,COR and l .
Here, we mainly discuss the influence of factors ballv and COR.
Summary Our model is mainly to study the various factors on the Hitting-Effects of baseball.
Then we analyzed the influences of the most important factors: the speed of the bat before hitting and the COR.

Vehicle mechanical properties and speeds are randomly sampled within a Monte Carlo simulation.
The structure's properties are listed in Table 1.
Table 2 lists the range of vehicle properties used in the simulation that can be found in the literature [6], and were sampled using a uniform random distribution.
Fig. 6 shows the probability distributions for each of the vehicle's natural frequencies as a result of the random selection of the properties in Table 2.
The approach has been numerically checked for various road profiles, damage and vehicle properties.

High Al low C - Mn steels are attracting growing interest because of their unique mechanical properties.
The major efforts in studying these steels are focused on the effects of heat treatment routes on the final properties.
To comply with customer demands, these products should not only possess the right combination of mechanical properties resulting from controlled TRIP-effect, but should also have satisfactory weldability, surface quality and coatability.
Both Si and Al increase the thermal stability of the retained austenite in final products, which is crucial for mechanical properties.
Evidently, in case of AHSS the factors other than variations in MFS come into play that result in wide spread of the rolling force.

Besides the excellent properties of matrix, fine particles play a role of dispersion and fine grain reinforcement.
Ultimately, according to the theoretical analysis, when solid metal or alloy material is subject to strong pulsed magnetic impact, the accompanied magneto plastic effects will have significant influence on the microstructure and properties.
In this paper, particles reinforced Al-Zn-Mg-Cu aluminum composite material at solid state is selected as subject and treated under a pulsed electromagnetic field, aiming to explore the microstructure evolution, properties and their inherent relationship, meanwhile, enrich the theoretical system of material electromagnetic processing.
It follows that the mechanical properties of macroscopic diamagnetic crystals with structural defects containing paramagnetic centers can be significantly affected by magnetic field.
It is specially mentioned that the action of random network local barriers on the dislocation motion is determined by many factors, such as the ionic radius, charge, spin, and number of impurity atoms in the complex.

Mechanical properties of concrete are highly influenced by its density.
The effect of disparate durations of high temperatures on the physical, mechanical and radiation properties of RSC must be investigated before construction.
"Evaluation of Radiation Shielding Properties for Concrete with Different Aggregate Granule Sizes."
Properties of Concrete.
Properties of Concrete. 4th.

（a）stress versus strain curve at 760℃ （b）stress versus strain curve at 790℃ （c）stress versus strain curve at 820℃ （d）stress versus strain curve at 850℃ （e）stress versus strain curve at 885℃ （f）stress versus strain curve at 910℃ （g）stress versus strain curve at 935℃ （h）stress versus strain curve at 960℃ Fig.2 Stress versus strain curves in 760~960℃ temperature interval at different strain rates It is found from Fig.2 that deformation temperature and strain rate are the most intensive factors to affect flow stress.
According to creep model, under low stress condition, relationship of flow stress and strain rate can be expressed as: (1) While under high stress condition, relationship of flow stress and strain rate can be expressed as: (2) Combining equality (1) and (2), relationship of deformation temperature, strain rate and deformation stress can be expressed by Jonas hyperbolic function as: (3) Where is strain rate; is structure factor; is stress level; is peak stress or steady state flow stress or flow stress corresponding some appointed strain capacity; is stress index; is deformation activation energy, which is an important parameter to attribute heat deformation; is gas constant; is thermodynamics temperature.
Temperature and strain rate are the most intensive factors to affect flow stress.
Stroshkov, et al., Structure and mechanical properties of VT22 (a+b) High strength titanium alloy semi-products, A.
[8] M.Brun, G.Shachanova, Principles of titanium alloys structure control with the purpose of increasing their mechnanical properties.

Since the thermal expansion coefficient is smaller in order of silica and zirconia, the residual stresses induced during cooling from the sintering temperature must be the dominant factor to determine the phase stability in these materials.
Microcracking leads to a decrease of the mechanical properties; this could explain the failure of implants after several years in vivo.
Fig. 4 Relationship between monoclinic fraction about (○) 3Y, (▲) 0.1Si, (■) 1.5Si, and (▼) 10Si and the amount of SiO2 addition after annealing for 30h. 0 2 4 6 8 10 0 20 40 60 80 Monoclinic Fraction (%) SiO2 content (mol%) 0 20 40 60 80 0 20 40 60 80 100 Time (h) Monoclinic Fraction (%) (a) (b) (c) (d)The transformation behavior is affected by residual stress that arises during cooling from the fabrication temperature as a result of thermal expansion mismatch between ZrO2 particles and second phase particles [9].
It can be said that the coefficient of thermal expansion of second phase particles is important factor to control the phase stability in zirconia.

Therefore, the analysis depends on various factors.
Various tests were conducted to survey the mechanical properties like tensile strength, flexural quality, affect quality and hardness of the half-breed composite material.
The mechanical properties of all the materials are given below.
Mechanical properties of steel are directly available in the database of Ansys Workbench.
The remaining mechanical properties of GFRP, a new composite material, were entered manually by indicating all the properties of high-grade natural fibres.

In the low matric suction stage, matric suction mainly contribute to shear strength by affecting the cohesion, yet in the high matric suction stage by increasing both the internal friction angle and cohesion; in the transition matric suction stage, the contribution of cohesion decreases while the contribution of internal friction angle increases.
The unsaturated soil deposits might undergo severe changes in mechanical behavior in response to increases in negative pore-water pressures.
Soil properties The soil used in this experiment was obtained from a certain department site in Xiamen.
There are many factors contributing to hysteresis effect.
Properties of unsaturated soils and slope stability of expansive soils[C].

In addition to having superior properties, the bacterial cellulose also has a weakness that is easily contaminated by microbes.
As a result, plasticizer is required to add to improve its properties.
Consequently, the hydrolytic properties in unstable chitosan were improved, then leading to the acceleration and control of the membrane degradation in the water medium.
Conclusion Bacterial Cellulose-Chitosan-Glycerol Biocomposite is showed the characteristic required for artificial duramater candidates due to the mechanical property and the cytotoxicity status.
Preparation and properties of CMC gel.