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The excellent properties of nano materials have attracted the scientists and engineers more towards nano technology.
Nano-sized materials exhibit novel and significant mechanical, electronic, magnetic and optical properties in comparison with larger size particles.
Many researchers [12–16] have prepared heat transfer nanofluids by dispersing the nano sized solid particles in base fluids and studied their heat transport properties and convective heat transfer enhancement.
In aqueous media, the pH of the sample is one of the most important factors that affect its zeta potential.
Wu (2005) Heat transfer properties of nanoparticle-in-fluid dispersions (nanofluids) in laminar flow, International Journal of Heat and Mass Transfer [16] Dongsheng Zhu , Xinfang Li , Nan Wang , Xianju Wang , Jinwei Gao , Hua Li, Dispersion behavior and thermal conductivity characteristics of Al2O3–H2O nanofluids, Current Applied Physics 9 (2009) 131–139

Xie 1 1 Department of Instrumentation, School of Mechanical Science and Engineering Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China 2 Department of Mechanical Engineering, Hong Kong University of Science and Technology Kowloon, Hong Kong, China Keywords: Plane Cross Grating, X-Y Stage, System Error Sources Abstract.
Experiments on factors such as system noise, guide error and motion interference are presented and the results are analyzed.
The noise of internal direction is larger than that of external one because inertia of internal layer is less and easier to be affected by environment.
Although this deflection does not affect the angle between the measurement and the motion direction, it will change the space between interference fringes and affect grating counter and subdivision.
The environment noise or disturbance mainly affects the system motion resolution.

The electrical conductivity, mechanical property, dimensional precision and surface finish of copper strip can directly affect its performance and quality.
According to Table 1, three design factors, each with three levels, are specified for copper strip drawing.
The three factors are assigned as follows: Factor A: the length of the reduction zone L1; Factor B: the length of the bearing zone L2; Factor C: the friction f.
Table1 Factors and levels of the orthogonal experiment Factors Description Level 1 Level 2 Level 3 A L1 (mm) 1 2 3 B L2 (mm) 1 2 3 C f 0.05 0.1 0.2 Table 2 Scheme and results of the orthogonal experiment Number A B C Drawing load (N) 1 3 3 0.05 1526.1 2 1 2 0.2 2879.6 3 3 1 0.2 2504 4 1 3 0.1 2304.4 5 2 3 0.2 2428.6 6 3 2 0.1 1926.4 7 2 2 0.05 1473.8 8 2 1 0.1 1816.6 9 1 1 0.05 1996 In order to find out the optimum levels of L1, L2 and f, Fig.7 is plotted for drawing load.
Notes that Ki is the average value at the same factor i ( i=1, 2, 3).

The demand of the economy of the modern car becomes higher and higher, and the lightening design of the vehicle is an important factor in improving the economy.
On the whole frame, we omit each leaf spring lug bracket, the car body bracket and the engine hanging bracket, ignore some small holes in size and having a little influence on the mechanical properties of the frame structure.
The number 3.5 is the dynamic factor for off-road vehicle dynamic strength calculation.
The Measure of the Lightening Design On the premise of not affect the structure and function, reduce the material on the place where the stress is too little.
We can make full use of the mechanical properties of materials to achieve the goal of saving material, reasonable frame structure, and Lightweight frame.

The Microcontact Analysis of Contact Length Between Wheel and Workpiece in Precise Grinding Jeng-Haur Horng1,a, Chin-Chung Wei2,b, Yang-Yuan Chen3,c, Yuh-Ping Chang, 4,d 1,2,3Department of Power Mechanical Engineering, National Formosa University, Taiwan 4 Department of Mechanical Engineering, Kun Shan University, Taiwan ajhhorng@nfu.edu.tw, bccwei@nfu.edu.tw, ctd7211@gmail.com, dypc0318@mail.ksu.edu.tw Keywords: contact length, surface roughness, microcontact mechanics Abstract.
Analysis of Theory When calculating true contact length, three factors should be considered: (1)geometric contact length, (2)deformation contact length and (3)grain contact length of the surface roughness effect.
It is apparent that under the same depth of cut, the roughness factor of aluminium is largest, followed by copper and EN9 steel, both of which have similar roughness factors.
Conclusions Elastic-plastic mechanics and the microcontact theory have been used to analyse contact properties between a grinding wheel and a workpiece to investigate the relationship between surface roughness and the contact length of the grinding wheel.
It has been revealed that parameters associated with surface roughness were indeed the main factors in affecting contact length.

According to earlier researches a good improvement in impact and mechanical properties could be achieved with the small addition of different nanofillers.
It was seen that all these particles improved mechanical and damage tolerance properties.
The mechanical properties of nanoparticle added polymer composites are affected by the degree of dispersion of the nanoparticles in the polymer matrix [13].
Kamada and et al. claimed that 0.4 wt% multi-wall carbon nanotube in aramid fibre reinforced composite exhibited better mechanical properties [13] and J.L.
Suman and et al, Investigation on Mechanical, Thermal and Bonding Properties of MWCNTs Reinforced Aramid/Epoxy Composite, Nano Hybrids and Composites, 30 (2020) 27–40.

Abrasive wear of materials is influenced by many factors such as properties of materials, operating conditions, geometry of wearing bodies, and environmental conditions [15, 16].
The results are not good agreement to Rabinowichz's theory [17] because it claims that hardness and applied load are the most important factors affecting the abrasion process.
It can be seen that the strongest influence occurred by factor Land factor D, respectively.In a similar way,for the diamond+SiCp-reinforced MMCs, the factor L and the factor D have strong effect on the abrasive wear of the composite, but the factor S has the least effect on the wear of it. 3.2 Multiple linear regression models To establish the correlation between the material properties and wear properties like load, sliding distance and sliding speed, multiple linear regression modelson the weight loss (WL) is obtained using statistical software“Minitab15”.
Faga, Surface properties of diamond coating for cutting tools, Annals of the CIRP 56 (2007) 573-578
Wang, Y.Guan andY.Z.Zheng, Properties and applications of Ti-coated diamond grits Mater Process Tech.,120 (2002) 369-373

However, polymer and ceramic degradable materials exhibit inadequate mechanical properties and their degradation products could cause an inflammatory response [4].
The addition of HA, a constituent of bone, serves to reinforce the MMC and enhance its mechanical properties.
Uniform dispersion of HA is reported to increase the corrosion resistance and mechanical properties of the composites, due to the increase in interfacial area between Mg α-phase and HA particles [3][2].
Factors that affect the degradation behaviour of Mg alloys include: grain size, composition, microstructure and distribution of intermetallic phases.
Assessment of Biodegradable Magnesium Alloys for Enhanced Mechanical and Biocompatible Properties.

Their high performance and fireproof properties have made them excellent candidates as matrices in advanced composites for strengthening.
This is mainly attributed to one of the most important drawbacks of AAMs, the difficulty to produce a specific mixture, since the affecting factors are profuse.
§ AAMs can have comparable or even better properties over their cementitious counterparts, indicating promising perspectives for total replacement of cement in future strengthening applications
Structures, Processing, Properties and Industrial Applications, Woodhead Publishing, 2009, pp. 194-210
Y., Hao, X., Fan, W., Experimental study on high temperature properties of carbon fiber sheets strengthened concrete cylinders using geopolymer as adhesive, Procedia Eng. 135 (2016) 47-55

Some of the Basic Properties of Recycled Concrete Workability.
Adding different types and quantity of recycled aggregate, the mechanical properties showed significant differences.
Factors that determine the permeability of concrete can be divided into two categories.
One factor including concrete mixing material components, mixture, and process parameters, etc.; another factor is the concrete changes with time, that is, in the external environment , structural stress, fluid properties and infiltration conditions and other factors, the concrete within the physical and chemical changes occur.
These factors may lead the production of recycled aggregate concrete to an important way to the future.