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Microstructure and mechanical properties of friction stir welding joint of pure copper Yong Zhao1, a , Youli Ye1,b, Keng Yan1,c and Lilong Zhou1,d 1 Provincial key Lab of Advanced Welding Technology, Jiangsu University of Science and Technology, Zhenjiang Jiangsu 212003，China azhaoy418@sohu.com, byoulilaomu@163.com, c yankeng@126.com, d longvis@sohu.com Keywords: Pure copper, Friction stir welding, Microstructure, Mechanical properties.
Microstructures and mechanical properties of pure copper weld joints are discussed under different parameters of friction stir welding.
The microstructures and mechanical properties of the welded joints were also analyzed.
After welding, the microstructures characteristics and mechanical properties of the welded joints were also analyzed.
The rotation speed of the tool has an impact on welding heat input and could soften the material plastic flow, consequently affecting the microstructure and mechanical property of the joint.

Increasing the plasticizer content decreases the tension strength and increases the elongation at break of the samples, and the type and amount of the plasticizers affect the mechanical properties of the composite films.
The use of packaging materials may prolong the shelf life of a food by seperating it from various deterioration factors [1].
Mechanical Properties Experiment.
The mechanical properties of gelatin-chitosan composite films may be affected by the types and amounts of plasticizers in them.
Conclusions The types and amounts of plasticizers affect the moisture sorption and mechanical properties of gelatin-chitosan composite films.

They were studied in the means of basic physical properties, mechanical properties, water transport properties and water vapour transport properties.
The transport of water or water vapour through the material affects many other properties such as thermal and mechanical properties, resistance to frost and aggressive substances, which can be dissolved in water (such as sulphates, chlorides, etc.) or in the form of gaseous pollutants [1, 2].
Water transport properties.
Figure 3 shows the mechanical properties of the studied plasters.
Fig. 3 Mechanical properties of studied plasters.

The main drawback of this material is the high level of autogenous and especially drying shrinkage that affects it, causing the deterioration of its mechanical properties.
The type and dosage of the activator as well as the method of curing have a significant effect on the course of the hydration process and final mechanical properties [2].
The main motivation for the research is to reduce the cracking tendency and improve the tensile properties of these materials.
Since spontaneous drying of the material affects its final properties, conditions which are supposed to have minor or no impact on the mechanical properties of AAS mortar were chosen.
Day, Factors affecting early hydration characteristics of alkali-slag cements, Cem.

Material properties test of wooden architecture and its mechanical properties Lin Xu 1, a, TieYing Li 2, b 1 Architecture and Civil Engineering College, Taiyuan University of Technology,Taiyuan,Shanxi,030024,China 2Architecture and Civil Engineering College, Taiyuan University of Technology,Taiyuan,Shanxi,030024,China a563009603@163.com, blty680412@163.com Keywords: experiment, wood, wood-frame building, properties, bending strength Abstract.
The structure of wood The material structure of wood is the key factor to determine the overall performance of wood properties and structure.
Besides, fiber saturation piont is the turning point when all of the physical and mechanical properties change of wood. 
Mechanical properties of wood  Strength The strength of wood shows as significant anisotropy.
Wood mechanical properties test In order to make an accurate theoretical analysis of wood, so we work on more than one set of the specimen material of wood test.

The chemical compositions, mechanical characteristics of SiC and the factors which affect the polishing precision and quality are analyzed.
Fig.1 Schematic diagram of chemical mechanical polishing 3 Test conditions and parameters selection of polishing For SiC in chemical mechanical polishing process, polishing, polishing pad ratio selection, pressure and velocity determination which is to obtain high removal rate and high quality polished surface are important factors. 3.1 Polishing liquid and ratio Polishing liquid comprising water, polishing powder and some additives ( surface active agent, stabilizer, dispersing agent ) etc., that are suitable for polishing liquid can reach the chemical action and mechanical effect of the best effect, high polishing efficiency, good quality.
But the good fluidity, is not easy to precipitate or cake, due to its good suspension property and no toxicity.
dz/dt=KP(x,y,t)V(x, y, t) (2) In the formula, K is the constant of proportionality, by speed and pressure outside of the factors, such as polishing material, the material of the workpiece, and a polishing material, concentration, as well as environmental temperature, humidity.
Many factors affect the efficiency and quality of polishing processing.

To master the regular pattern of the influence of relative factors on physical and mechanical properties of phyllite is the basis to establish an effective construction method.
As a regional metamorphic rock, the engineering properties of the phyllite are rather complex.
To master the regular pattern of the influence of relative factors on physical and mechanical properties of phyllite is the basis to establish an effective construction method.The influence of water and mineral composition on physical and mechanical properties of phyllite was analyzed through relevant tests.
It is necessary to find out a set of well-established scientific construction methods for phyllite tunnels, and one of the bases to find an effective construction method is to acquire the law on the influence of relevant factors on physical and mechanical properties of phyllite.
Test on influence of mineral composition on physical and mechanical properties of phyllite A large number of tests have been done during the construction process, according to the tests, the results of the physical and mechanical properties of phyllite that is mixed with different minerals are shown as Table 4.

The mechanical properties of composites were greatly affected by the temperature of barrel.
The length of residual glass fiber was not directly corresponding with the mechanical properties.
The results of mechanical properties are also shown in Table 3 and the analysis of mechanical properties was shown in figure2 and figure 3 respectively.
Fig.2 Effect of four factors on tensile and flexural strength Fig.3 Effect of four factors on impact resistance The optimal choice of pellets’ length was 10mm (A2) for the highest mechanical properties of composites.
Ultimately it leaded to defective products and decreased the mechanical properties.

The results show that the mechanical properties of the steel, especially the uniform elongation of the steel plate, are important factors affecting the shear crack.
The aim of this work is to verify the effect of the mechanical properties of the material on the shear crack, especially the uniform elongation.
These properties were determined experimentally for steel A and steel B.
Effect of direct quenching on microstructure and mechanical properties of medium-carbon Nb-bearing steel, Journal of Zhejiang University-SCIENCE A. 11(2010) 776-781
Microstructure and Mechanical Properties of 780MPa High Strength Steels Produced by Direct Quenching and Tempering Process, Journal of Material Science. 37( 2002) 1973

Thermo mechanical processing and controlled rolling of microalloyed steel sheets are affected by several factors.
Findings of this research provide suitable connection among finishing temperature, microstructural features, and mechanical properties of hot rolled Nb-microalloyed steel sheets.
To study the finishing temperature effect on mechanical properties, the finishing temperatures were chosen according to the processing schedule illustrated in Fig. 1.
Strength properties.
Qin et al. (1996), showed the parameters affecting the percentage of elongation as the size and morphology of ferrite grain and size and shape of precipitates.