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However, these rubber products can degrade due to various factors such as heat and light [3], which can affect their mechanical properties and performance.
In order to fill this knowledge gap, this research aims to investigate the effect of limonene on the mechanical properties and chemical decomposition of medical rubber.
Tensile properties, a) elongation at break and b) tensile strength.
It has enhanced the stability and mechanical properties of polymers [9].
This has led to improvement in elongation properties and potentially higher tensile strength.

Firstly, according to large number of examples of instability disaster in mines at home and abroad, influence factors of goaf stability was analyzed, including characteristics of surrounding rock, conditions of engineering geology, engineering properties, structure parameters of goaf and other artificial mining and time etc.
Introduction Influence factors of surrounding rock stability on underground goaf are numerous, including joint properties of rock mass, groundwater, gas, size of goaf, time, buried depth, supporting conditions, as well as high temperature, high pressure in deep mining, etc.
And moreover, it suffered from coupling effect of multi-factor and multi-field, making the underground goaf show high uncertainty of mechanical deformation properties, nonlinearity of constitutive relationship and mutation of failure process.
These factors are variable, with spatial effect.
Fractal-Rock Mechanical Introduction.

This paper combine the traditional methods and the granulation technology to obtain the cell membrane and the nucleus with similar core-shell structure of the granulated material, to study the internal microstructure of the granulated material and the characteristic parameters of the friction material as the basic unit of the friction material, wear performance and density, hardness, impact and other physical properties of the mechanism to regulate and control the friction material as a whole tribological properties and mechanical properties.
Experimental factors Proportion Particle size 1:1 1：2 2：1 1-3mm 1 2 3 3-5mm 4 5 6 5-8mm 7 8 9 8-10mm 10 11 12 1-10mm 13 14 15 The physical properties of the granulation friction material Impact strength Predetermined measurement method according to GB5765-86, XJ-40A plastic impact testing machine to test the friction material impact strength, Charpy impact test using cylindrical branched.
In addition to the aggregates bonding mechanism main factors affecting the strength of the briquettes is the void ratio and particle size of the agglomerates[11].
Part of the granulation friction material friction and wear properties Test equipment and test methods Jilin University Institute of Mechanical and Electrical Equipment Manufacturing JF150D-II fixed-speed friction testing machine, friction and wear testing.
After the test is restored friction material friction and wear properties of the end of the experiment.

Taipei 106, Taiwan 3 Department of Mechanical and Electrical Engineering, National Taipei University of Technology, 1 Sec.3 , Chung Hsiao E.
The friction force of pneumatic cylinder bore directly affects the output dynamic property of pneumatic cylinder motion.
As a result of these multiple factors, during operation, the pneumatic cylinder bore and the O-rings of sealing components are to be affected, Since relative motion is carried out, there are temperature change and mechanical property change caused by the surface profile, lubricating film, organizational structure and friction.
It was proved that the physical and chemical properties in terms of nanodimensions could provide more effective anti-wear and friction reduction natures than traditional additives [6-11].
On the design of measurement, it is required to clarify the complicated factors affecting measurement and propose a reasonable friction force analysis model for the testing platform in order to confirm whether the numerical values of measurement are correct or not.

Design and Study on Mortar Pump's Impeller Based on Bezier and Mechanical Mechanics MingXin Chen1,a, LingFeng Tang1,b, Ge Zhou2,c, ZhongYing Dou3,d, XiaoLi Yang3,e and XiaoYang Du3,f 1College of Mechanical and Automotive Engineering, Anhui Polytechnic University,Wuhu Anhui 241000 China 2National Center of Supervision and Inspection on Auto Parts Products Quality(Wuhu),Wuhu Anhui 241007 China 3Chery Automobile Co., Ltd ,Wuhu Anhui 241009 China acmx1215225@163.com,bwymtlf@126.com,czhou__ge@126.com, ddouzhong_ying@163.com,eyxiao_li@163.com, fduxiao__yang@163.com Keyword: Expansion of the blade profile; Bezier Curve; Mechanical mechanics;Numerical simulation;Performance Abstract.
factors to improve the shape of the blade profile need plenty of operations and observations to determine the satisfaction value.This makes the operation fussy and it is blindfold.this method is difficult to concentrate the influential factors overally , and it can't avoided the appearance of "S" shape.
The blade angle is an important factor of the blade geometric parameters.the decrease of the adverse pressure gradient in the blade duct is beneficial to the energy exchange of the blade and the fluid .Increase the blade Angle can effectively reduce the blade duct's diffusion and the adverse pressure gradient, restrain the superficial flow of the blade Angle , but if the Angle is too large, the friction loss between the blade and the fluid will increase [1].YangHua has taken a numeric simulation test for the centrifugal pumps who have different blade Angles , and the results show that when doing the blade modeling design for the impeller in the same size , there exist the best blade Angle[2].Li Yue has studied the low specific speed sewage pump blade Angle's influence to the hydraulic properties, and the results show that:when the blade Angle is changing,the pump's efficiency exist a high value point, and the high efficiency blade Angle correspond to the law that the low specific speed
This curve's properties are as follows[4]: (1) P(0)=P0,P(1)=Pn.Namely: the tangent direction of the starting point and the end point of the curve is equal to the characteristic polygon's first and final side's direction; (2) Symmetry:The curve which is composed of the Pi and the Pn-i has the same position but opposite direction; (3) Envelope sex:Pn(t)=(1-t)Pn-1(t)+tPn-1(t); (4)Convex hull: The Bezier curve is surrounded by the control polygon's convex hull Using the Bezier Curve to Draw the Expansion of theBladeProfile Confirm the Main Parameters of the Pump.
Mechanical Performance Comparison of Traditional Impeller and Modified Impeller.

That is to say, since a neutron collides onto the crystal lattice of a metal and produces a primary defect, until the mechanical properties of the material are affected, the scale of time goes from the picoseconds to decades and the dimension from the atomic level up to the size of the vessel [4].
Elemental influence on mechanical properties [2] Element Description of the element influence on mechanical properties Impurities Cu Odette et al. [13] concluded that a copper content greater than 0.1 wt% generates copper-rich precipitates that are responsible for irradiation embrittlement of reactor pressure vessel materials.
P Phosphorus content greater than 0.02 wt% negatively affects the mechanical properties of the material [14] because it increases the brittleness of the material at higher temperatures.
Alloy elements Mn Manganese improves the mechanical properties of alloy steels.
By its use it is possible to study the influence of different alloying elements and impurities on the mechanical properties of materials.

High temperature at the machining area affects the surface properties of both electrodes especially on the workpiece machine surface.
The structure of the heat affected layer is different from the base material.
Although it is favorable in term of improved wear resistance, defects such as voids, cracks, residual stresses, etc. result in overall deterioration of the component mechanical properties.
Pulse interval will affect the speed and stability of the cut [8].
The selection of tool electrode material is so important by mean to obtain high expectation of desirable properties of tool electrode.

WPCs are vulnerable to weathering factors such as UV radiation, moisture and freeze-thaw action.
Weathering can cause discoloration, chalking, dimensional changes and loss of mechanical properties.
Process temperature is a significant factor during manufacturing, as high temperatures damage the wood fibers and thus weaken the mechanical properties of the WPC product.
WA and TS are material properties that are greatly affected by the wood content in the products.
Tajvidi, Mechanical properties of composites from sawdust and recycled plastics.

In fact, the welding process leads to changes in the material mechanical and microstructural properties at a small area in the vicinity of the welded joint.
The interaction between mechanical properties and thermal/metallurgical ones are neglected since there is a slight coupling between them.
During the analysis, these properties evolve with the temperature.
The influence of the thermo-metallurgical properties on mechanical ones is taken into account by the mean of numerous parameters.
The stress concentration factors of the welding joint types used in these studies go from 2 to 5.

Measurement on fresh geopolymer properties was conducted with setting time and flowability tests, while degree of reaction tests was conducted on the hardened specimen.
Previous studies revealed many factors that contribute to the enhancement of mechanical behavior and durability properties of geopolymer, such as chemical oxide composition of aluminosilicate source, alkali activator, curing temperature, admixtures, and mix design.
Temuujin et al., (2009) investigated the effect of calcium compounds on the mechanical properties of fly ash geopolymer paste and discovered the enhancement of mechanical properties of fly ash based geopolymer with the inclusion of calcium compound (CaO) at room temperature [1].
To observe the effect of various curing temperature on the properties of geopolymer containing paper mill sludge ash, degree of reaction, compressive strength and porosity test were conducted on the hardened specimen.
Generally, characteristic of workability will depend on its viscosity properties.