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Mechanical Properties of Polyurethane Foam Nowadays, polyurethane foam is used as filling material of car seat, their production is relatively fast and accurate.
Polyurethane foam is characterized by visco elastic properties combining the properties of solid and liquid.
Elastic properties predominate in short-term loading.
The results of numerical simulations lead to design of whole composite car seat cushion with specific mechanical properties.
Mechanical properties measurement and comparison of polyurethane foam substitute.

The study shows that the initial conditions, temperature changes during thermal forming and phase deformation are the main factors affecting rebound.
Its initial strength is 500～600Mpa, and it also possesses a variety of properties including high strength, good strain hardening capacity, strong uniform deformation and good fatigue properties[1].
At the same time, influences of several factors including steel board thickness on high strength sheet forming property are discussed.
If soaking time is too long, austenite grains inside the sheet will grow continually, then forming properties of sheet and mechanical properties of forming parts will be decreased significantly; If soaking time is too short, austenite grains inside the sheet will be non-uniform, so as to the parts deformation of sheets in the process of forming.
At the same time, influences of several factors including steel board thickness on high strength sheet forming property are discussed.

A subsequent aging treatment leads to a further increase in mechanical properties.
Mechanical properties of the surface were investigated by microhardness measurements (HV0.3).
B: bainite, GB: granular bainite, PF: polygonal ferrite Mechanical properties.
Mechanical properties of the cross section were studied by careful microhardness measurements.
Influence of pre-strain and aging temperature on mechanical properties.

Salari, Effect of using walnut/almond shells on the physical, mechanical properties and formaldehyde emission of particleboard. 
Mehar, Effect of surface treatment on the mechanical properties of bagasse fiber reinforced polymer composite. 
Du, Influence of NaOH treatment on the mechanical properties of particleboard. 
Olaya Florez, The influence of alkali treatment on banana fibre's mechanical properties. 
Cioffi, Chemical modification effect on the mechanical properties of hips/coconut fiber composites. 

EVA has the amorphous structure, which generally reduces the mechanical properties of LDPE after blending with the LDPE resin but, in this paper, by the method of melt blending, six kinds of LDPE/EVA films with different content of EVA were prepared, and the mechanical and barrier properties were studied.
Fig.2 influence of EVA amount on Fig. 3 influence of EVA amount on the LDPE film of Young's modulus the tensile strength of LDPE films When the EVA content increased further, EVA modified LDPE film Young's modulus and tensile strength decreased, that’s because when the EVA content is greater than 5%, EVA makes hindered the migration of LDPE, slow crystallization rate, to lower the crystallinity of LDPE, the mechanical properties caused by decreased synthesis of the factors is greater than the role of VA in the heterogeneous nucleation, and therefore high EVA content, the mechanical properties of modified films is reduced.
Apparently, EVA content of 5% of the modified film was the best mechanical properties.
In order to verify the causes of changes in mechanical properties of modified films, the six blend membrane samples were tested through DSC thermodynamics properties of analysis, the results as shown in fig. 6 and 7.
But to combine these factors, the oxygen barrier of the film on the decline was caused by EVA content increase, that is, with the EVA content increasing, the blend film OTR was increased.

In this paper, two main influence factors of the movement, BHF and the blank thickness at the both sides of the weld-line, were studied by both the experiments and finite element simulation.
The laser welding technology is used to join some blanks with different thickness and material properties into the TWB.
So the thickness ratio is also an important influence factor to the weld-line movement
E200518) References [1] Wang D C: Mechanical Workers (Hot forming) (In Chinese).
Issue 9, 7, 2004 [2] Li S H, et al: Chinese Journal of Mechanical Engineering (In Chinese).

There are many affecting factors in the precision of powder products, such as the design of mold shelf, manufacturing precision, sintering conditions and subsequent processing.
(4) Because the major parts of frame are welded or mechanical fastening.
Mechanical properties of Q235 are shown in Table 1.
Table 1 Mechanical property of Q235 Elastic odulus [GPa] Poisson's ratio Yield stress [MPa] Tensile strength [MPa] 206 0.3 235 375 ANSYS software based on finite element analyzed the frame of powder molding press.
This unit can analyze the stress of the structure, deformation, etc., conforming to material properties of realistic steel and the results of data analysis [10-11].

The Influence Factor Analysis for Coupling Performance of HSK Tool System Chunjiang Zhou Zhejiang Institute of Mechanical and Electrical Engineering, Hangzhou, 310053, PR China zcj7012231@126.com Key words: HSK tool system, interference, coupling performance Abstract.
The coupling performance of tool system is the important factor for the machining quality of high speed machining.
In this method, the paper brings forward how the amount of interference will affect the coupling performance.
Ai: Chinese Mechanical Engineering, (2004), p. 391-394 [3] S.L.
Ai: Mechanical Science and Technology, (2004), p. 631-633 [5] Y.M.

In addition, the effect of the interfacial IMC on mechanical properties of solder joints was in-depth summarized.
It should be noted that the growth of IMC in interconnection solder joint is effected by many factors such as service environment, the size of solder joint, solder materials, service temperature and time.
The formation and growth of Kirkendall voids is decided by the following two factors, one is the growth rate of the interfacial IMC, the other is solubility of Cu into Sn and IMC under thermal aging [18].
Effect of interfacial IMC on the mechanical properties Strength of solder joints mainly depends on interfacial IMC [24].
In addition, when solder joints undergoing thermal and mechanical stresses, the dendritic Ag3Sn will seriously affect the mechanical properties of solder joints, and significantly decreases the strength of joints [26].

Mechanical Properties Analysis on Elongation Type of Pneumatic Artificial Muscles Geng Dexu 1,2, Zhao Ji 1, Zhang Lei 1 and Zhao Yunwei 1,2 1College of Mechanical Science and Engineering, Jilin University,Changchun 130022, P.R.
Therefore, the mechanical properties of the PAM directly influence the performance of the flexible joint.
An analytical modeling of the PAM is proposed and discussed with both mechanical and experimental approaches for its mechanical properties, it will give the direction of flexible joints and robot’s dynamic performance analysis and motion accuracy control.
The total volume of the rubber tube is not changed during the deformation according to the properties of rubber,and the outer diameter of the rubber tube is not changed as a result of the constraint on the tightly twisted spring.
(a) Experimental data (b) Theoretical data Fig.9 Bending deformation vs. the bending moment Conclusions The mechanical properties of the developed elongation PAM is investigated including its axial elongation deformation as well as bending deformation.