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The structure, elcctrical conductivity and mechanical properties of the composite were studied in detail.
The SEM characterization indicates that CNTs were dispersed uniformly in the PPS matrix, which leads to a remarkable improvement in mechanical properties of composite.
Recently, polymer/Carbon nanotubes (CNTs) nanocomposites have gained intensive interest because of their unique and valuable properties, such as, in mechanical[9], thermal [10], and electronic [11] properties compared to the pristine polymers.
One of the advantages of CNTs as a reinforcement filler is their large surface area that can induce a better adhesion with the polymeric matrix, which is an important factor for an effective enhancement of the composite properties [12].
So the ball milling process is ideal technique for preparation of PPS composite with high elcctrical conductivity and mechanical properties.

Keywords: Silicon nitride ceramic ball, Material properties, Correlation coefficients.
For the Si3N4 ball, the material properties can be described by the following factors: density, hardness, apparent porosity, crushing load and fracture toughness.
The density of ceramic material, is relevant to its mechanical properties and thermal stability.
When correlation coefficient is equal to 1, it means that the two factors have a close relevance, while correlation coefficient 0 suggests the two factors have no relationship with each other.
The reason may be that apparent porosity has an influence on the structural strength, which affects the bearing capacity of ceramic balls. 4 Conclusions The inherent correlation among materials properties are obtained as follows: (1) With the increasing of the apparent porosity, its density will decrease correspondingly

Introduction Seeker, involved in the final guidance of missile, is the key factor affecting guidance accuracy.
As one type of aviation parts, seeker’s mass should be controlled and its mechanical properties must also meet the design requirements, stiffness, strength, et al, so as to bear the complicated tough application environment conditions.
To optimize the design of the framework for an infrared seeker, the basic requirement is that mechanical properties should be guaranteed and improved without an incremental in mass or weight.
Fig. 2 The initial design for inner and external framework structures To verify the mechanical properties of the primary design of the chosen structure, FEM analysis was carried out.
Fig. 6 FEM analysis results of the optimized design for inner framework Fig. 7 FEM analysis results of the optimized design for external framework After optimization, the mechanical properties of the frameworks had been improved.

Table 2 Mechanical properties of rolling direction of 2195-T8 Al-Li alloy.
Result and Discussion Effect of Machine-based Parameters on Mechanical Properties of FSW Joints.
Mechanical Properties and Welding Parameters Window of Friction Stir Welding.
Effect of Welding parameters on microstructure and mechanical properties of friction stir welded AlCuLi alloy joints.
Effect of process parameters on mechanical properties of friction stir welded 2195 Al-Li alloy joints.

Although poor design is one of important factors, pre-existing cracks or defects in the original material are predominant reasons for the catastrophic failure of these large and heavy equipments.
Stress concentration is an important factor affecting the brittle fracture of steel structure.
Therefore, the crack tip stress state is very important for the fracture properties of components.
Int J Numer Meth Eng, 1999; 46: 131-150 [4] Yuwen Dong, Tiantang Yu, Qingwen Ren, Extended finite element method for direct evaluation of strength intensity factors.
GB/T 21143-2007 (2007) [7] Mechanical Engineering Materials Manual.

The electrical and mechanical properties of the PS/PSEG were measured.
The mechanical properties and electrochemical properties of the composites were investigated.
Results and discussion Mechanical properties.
Electrical properties.
(a) Impact strength (b) Tensile strength Fig.1 Mechanical properties of PS/ PSEG composite materials Fig. 2 Surface electrical resistance Rs of PS/ PSEG composite materials Distribution.

The immobilized enzyme and free cellulase was treated on ramie fabrics and the relative mechanical properties were tested.
The enzyme reactions are carried out in vitro and usually sensitive to environmental factors, so the process requires stricter conditions [1].
Ramie fabric properties.
Effect of enzyme treatment on fabric mechanical properties.
Table 2 Effect of enzyme treatment on fabric mechanical properties Sample Breaking strength (N) Linear tensile (LT) Power （gf·cm/cm2） Cracking-time (s) 0h 4h 8h 0h 4h 8h 0h 4h 8h 0h 4h 8h buffer 454 607 12.1 13.9 1.56 2.20 7.29 8.39 enzmye 80 9.2 0.23 5.54 A 256 337 10.4 3.3 0.8 0.36 6.28 1.99 B 249 190 11.7 9.7 0.7 0.40 7.03 5.83 C 314 355 16.0 3.3 1.0 0.36 9.62 2.02 D 240 144 12.6 10.9 0.7 0.53 7.61 6.56 Fabric mechanical properties after different treatments revealed that enzymatic treatment of fabric affected breaking strength, cracking time and length more or less.

This experimental study was undertaken to identify the significant factors that affect the output responses while machining of 10 vol%Al2O3/Al composite material.
However, since the material is subjected to such a high temperature, the mechanical and chemical properties of workpiece may be affected adversely.
The physical and mechanical properties of the composite material are provided in first section of Table 1.Using causal method and a preliminary pilot study, the factors that may affect these three responses in EDM were identified.
The results are in line with those reported in literature [17] which reported that pulse on-time is the most significant factor affecting the thickness of recast layer while machining dual phase Fe-Mn-Al alloy.
CONCLUSIONS The experimental study was undertaken to identify the significant factors that affect the output responses while machining of 10 vol%Al2O3/Al composite material.

Besides, the sequence results of influencing degree of the factors affecting the compressive strength and workability were obtained.
The results indicate that the compressive strength and slump of GHPC are affected by various mix proportion factors with different sensitivity, and the sensitivity could be well analyzed by the grey relational analysis.
Besides, the sequence results of influencing degree of the factors affecting the compressive strength and workability were obtained.
The results indicate that the compressive strength and slump of GHPC is affected by various mix proportion factors with different sensitivity.
Zhang, Combined effect of polypropylene fiber and silica fume on mechanical properties of concrete composite containing fly ash, Journal of Reinforced Plastics and Composite, 30 (2011) 1851-1860

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.