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In the extrusion process two main factors are considered.
Aluminum is used for its prominent properties of lightness (3 times lighter than steel), erosive endurance and ease of formability.
Materials and Methods Although finite element analyses of aluminum as extrudate have been frequently reported, a study of the properties of an extrusion die and a pocket material with FEM has rarely been performed.
Boundary conditions, loads and material properties were defined before the analyses were run, Four (4) parameters that influence the extrusion process were studied.
Table 3: Best factors and their max.von Mises Stresses Order Parameters Best factor Max. von Mises Stress [Gpa] Safety factor 1.

Apply various ways of heat treatment to improvement of mechanical properties of welded connections and increase in a resource of work.
The structure shows considerable crushing of metal: mechanical properties improve, the physical density of metal considerably increases.
However in the course of welding more than 1 mm lead use of amplitude of vibration to decrease in mechanical properties of metal of a seam, formation of cracks, a time and other defects.
At the same time with increase in frequency of vibration influence, there is a smoothing of curves of microhardness that demonstrates decrease in heterogeneity of mechanical properties on width of welded connection.
Karetnikov, Technological capabilities improve weld metal Mechanical properties of steel 09Mn2Si, Zapiski Gornogo instituta. 209 (2014) 104-108.

In the alloy system, Oxygen and Nitrogen contents, micro-alloyed elements (C, Mn) and its mixture ratio are the key factors that affect the deposited metals toughness.
For the integrity of the joint, the properties of the weldmetal should be matched with that of the base metal.
Main factor that affects the toughness of the SAW weldmetal is the microstructure formed during the welding.
Experimental results Typical chemical composition of the deposited metals by experimental SAW wire is shown in table 1, the mechanical properties and toughness is shown in table 2.
Table 2 Room temperature mechanical properties and toughness of the deposited metals No. σs/ (MPa) σb/ (MPa) δ /(%) ψ /(%) AKV -10°C/ (J) 12 559 626 25 75 123 21 640 653 21 68 141 22 631 653 21 66 127 23 586 654 23 70 144 Fig.1 Typical microstructure (AF and BGF) Fig.2 Relation of the proportion of AF and of the deposited metal toughness of deposited metal Effects of Pcm on the microstructure and property of the deposited metal.

High strength of PAN carbon fiber needs high strength of PAN precursor, and the molecular weight is an important factor to affect the strength.
At present, the influence of molecular weight (Mw: 4.5×104-1.5 ×105) on the several structural-mechanical properties (such as tensile strength, elongation, density, porosity, and crystal size) of PAN fibers has been investigate [6, 7].
Tsai et al. [7] studied the effects of the molecular weight (Mw: 1.65×105-4.29×105) on the cross section, surface, and structural-mechanical properties.
However, it is not fully clear how the molecular weight (Mw: 2.5×105-8.0×105) affects the structure and properties of PAN precursor.
(4) Mechanical property The mechanical properties of PAN precursors were measured by a XQ-1(XQ-1 was made in Donghua University, Shanghai, China) tensile-testing machine at a crosshead speed of 0.5 mm/min with a testing length of 20 mm.

The homogenisation cooling rate can also impact on the behaviour of the billet during extrusion processing as well as affecting the final mechanical properties.
As an additional processing step, its benefit for the further processing of the alloy or the resulting mechanical properties must justify the operation.
Slow preheat results in lower mechanical properties since stable β-Mg2Si forms which requires higher extrusion temperatures to dissolve the particles and productivity is affected as the extrusion speed may be reduced to avoid melting.
The extrusion press will limit lower billet temperatures being utilised, as well as other factors affecting the flow stress.
The high temperature heat treatment has a number of benefits for the further processing and development of mechanical properties of the alloy.

The creep properties of materials and finite element method Hongjiang Chen1,a 1Vocational technical college in Jiangxi Normal University of science and technology in china achenhongjiang2000@163.com Keywords： Creep temperature Finite element Abstract：Creep material forms are prevalent in many areas, but also directly affect the use of state and life system, how to analyze the creep properties of materials is crucial to the performance of the system.
This paper introduces the creep properties of materials under certain temperature factor equation and finite element method is used to analyze the. 1.
The significance and status of study on creep properties of materials Any material will creep to varying degrees in various environments, and has a significant impact on the security of modern industrial situation, especially in the petroleum, aerospace, chemical and mechanical transmission, so we must try to effectively control the creep properties of materials, thus to prevent and restrain effectively the.
From the thirty's of the last century, the people of creep properties of materials in different environments, is simulated and analyzed by experiment, the creep equation of many assumptions, and the creep constants of some commonly used materials related theoretical knowledge, but by the time the experimental equipment restricted and relatively weak, performance analysis of high temperature creep and relaxation the very limitations, can not be applied in a wide range of industrial production, to seventy or eighty years, considerable progress has been made in the research, model theory on creep has gradually become more systematic and standardized, although still not parameters form a standardized, but the study on creep properties later laid a good theory basis. 2.
Establishment of material creep equation 1) Nonlinear creep is caused mainly by the properties of the material, and that occur at a certain time and temperature conditions, therefore, the establishment of finite element calculation of creep problems, and the establishment of other nonlinear problems in finite element is different with temperature and time.

It is worthy to pointing out that the key factor which affect on the properties of diester magnetic fluid is the exact time of mixing second surfactant and the reacting temperature.
Results and Discussion Properties of Diester Based Magnetic Fluid.
Fig.4 Environment temperature versus Viscosity of Diester Based Magnetic Fluid Influencing Factors.
During the procedure of preparation, there are several critical influencing factors which affect on the size of prepared magnetic nano-particles and on the properties of diester based magnetic fluid.
Secondly, reacted temperature and speed are two other influencing factors for preparing diester based magnetic fluid.

As for sintering process, the sintering temperature, the temperature rise speed and holding time are all vital factors to the ceramic preparation.
AGC Mechanical properties test.
The physical and mechanical properties of the AGC are shown in Table 1.
With Alumina pre-sintering temperature and rise speed increase, mechanical properties of porous alumina are improved accordingly.
The increase of temperature velocity helps to improve physical and mechanical properties of AGC.

From the observation, the stress intensity factors and the fracture toughness values were calculated.
Results obtained from the two methods were compared and analyzed by the stress intensity factors and the fracture toughness values.
Table 1 shows the mechanical properties and the optical constant.
The stress intensity factors were obtained by substituting D ,and D, Dlmin and Dlmax in equations (2) and (3) below.
(4) There were both vertical and parallel stresses affecting on crack tip under unequal biaxial stress.

The working principle of the piezoelectric feeder was analyzed, the kinetic model was established, and the main factor which affects the delivery performance of the resonant feeder was obtained by calculation, and then designed the prototype.
Under the same condition of structure and size, the displacement range of the synthetic mechanical properties of the two ring magnet is larger.
When the mechanical system reaches its resonant frequency, the material conveying speed of the resonant feeder is faster; when the mechanical system deviates from the resonant frequency, the conveying speed is slower.
Getting the factors affecting on the displacement amplification of the resonance feeder system by theoretical analysis.Keep the other rigidities unchanged, adjust the mechinal system's rigidity by the means of adjusting the axial gap of the magnetic springs, reach the resonant frequency of the whole mechinal system to makes the resonant feeder work under the best condition.
The analysis of working property for magnetic spring[J].Equipment design and maintenance,2003(6): 73～74.