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Bocchini, The influence of porosity on the characteristics of sintered materials, International Journal of Powder Metallurgy (1986). 22 (1986) 185–202
Cook, Is porosity always detrimental to the wear resistance of materials?
Kishore, Dry reciprocating wear and frictional behaviour of B4C reinforced functionally graded and homogenous aluminium matrix composites, Journal of Materials Research and Technology. 9 (2020) 1578–1592
Kumar, Processing and dry sliding wear performance of spray deposited hyper-eutectic aluminum–silicon alloys, Journal of Materials Processing Technology. 213 (2013) 401–410
Farhat, others, Effect of surface porosity on tribological properties of sintered pure Al and Al 6061, Materials Sciences and Applications. 6 (2015) 549.

The size factor (ks) reflects non-uniformity of material properties due to size; it depends upon tooth size, diameter, face width, hardenability, heat treatment, etc.
(ix) The bending stress investigation was repeated for gear profile of modules 4.0 and 6.0mm using the same material properties, loading and boundary conditions.
The first author expresses gratitude to National Agency for Science and Engineering Infrasctrure (NASENI), Nigeria, for offering training on the use of a Finite Element package (COMSOL Multiphysics) in engineering modeling and simulation.
The Engineer, Journal of Engineering and Technology, Nigeria, Vol. 4 No. 1, pp 27 – 29, 2007
A., Drafting of Involute Spur-Gears in AutoCAD-VBA Customized Environment, Advancement in Science and Technology Research, (ASTR), Vol. 1 (2), pp. 18-26, 2014. http://www.netjournals.org/z_ASTR_14_026.html [8] Barkah, D., Shafiq, B. and Dooner, D., “3D Mesh Generation for Static Stress Determination in Spiral Noncircular Gears Used for Torque Balancing” Journal of Mechanical Design, American Society of Mechanical Engineers (ASME), 124 (2), pp. 313–319, 2002

Journal of Hazardous Materials, 117, 65–73
Journal of Materials Technology Research; 8(1):724 75–86
Bulgarian Journal of Science Education 21:389–395
Journal of Hazardous Materials, 158, 324-332
Journal of Hazardous Materials, 141,237-244.

It should be noted that friction stir processes can be also used to join the metallic materials [4] and thermoplastics composites [5-7].
Mroczka, Friction stir welding of elements made of cast aluminium alloy, Archives of Metallurgy and Materials 59 (2014) 385-392
Jachym, Characteristics of Laser Welded Joints of HDT580X Steel, Materials Science Forum 638-642 (2010) 3739-3744
Dymek, A Coupled Thermal/Material Flow Model of Friction Stir Welding Applied to Sc-Modified Aluminum Alloys, Metallurgical and Materials Transactions A, 44 (2013) 1730-1740
Sedek, Using a Coupled Thermal/Material Flow Model to Predict Residual Stress in Friction Stir Processed AlMg9Si, Journal of Materials Engineering and Performance 24 (2015) 1305-1312

The Table 1 shows the applied materials.
The tensile, compression and the SEM tests were performed with the help of the Department of Polymer Engineering and the Department of Materials Science & Engineering of the Budapest University of Technology and Economics.
Journal of applied physics, 34/6. (1963) 1793-1801
[7] Qing-Hua Zhang, Da-Jun Chen, Percolation threshold and morphology of composites of conducting carbon black/polypropylene/EVA, Journal Of Materials Science 39 (2004) 1751-1757
MATERIALS SCIENCE FORUM 589 (2008) 179-184

Wen: Science in China Series E-Technological Sciences Vol. 46 (2003), p. 498
LV: Key Engineering Materials Vol. 297-300 (2005), p. 1895 [7] M.
Wu: AIAA Journal Vol. 32 (1994), p. 1717 [10] R.H.
Liu: Journal of Sound and Vibration Vol. 259 (2003), p. 1095 [12] Y.M.
Wen: Journal of Mechanical Science and Technology Vol. 21 (2007), p. 908 [14] Y.G.

Effects of Graphite Mold on Cooling Process of Fused AZS 33# Refractory Fei Yuan a, Daoyuan Yang b, Ting Wang c, Zhan Li d School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China a442681436@qq.com, byangdaoyuan@zzu.edu.cn; ctingting880311@163.com, d961017928@qq.com Keywords: AZS 33#; cooling process simulation; thermal conductivity; thickness of mold; graphite Abstract.
Computer simulation can express material cooling process vividly, quickly and accurately.
Acknowledgement This work was supported by the National Natural Science Foundation of China, under Grant No.50972131.
China Academic Journal Electronic Publishing House. 45 (2011) 26-29
China Academic Journal Electronic Publishing House. 35(2011)29-35

Materials of building facades mainly include ganged brick and granitic plaster.
The occurrence of alkali corrosion is closely related to the nature and conservation status of building materials.
The restoration and strengthening of historic masonry structure walls should improve masonry and other porous materials through perfusing and solidifying materials, rather than simply replacing the materials.
Only accurately grasping the historic materials and reasons for structural damage can consider the specific climatic environmental factors.
Beijing: Architectural Journal, 2011,5:21-24 [3]Peter Brimblecombe and Carlota M.

Water Science & Technology Vol.17 (1985), p.259 [4] F.
Petroleum Science Vol.9 (2012), p.544 [11] M.M.J.
Petroleum Science Vol.9.4 (2012), p.544 [16] G.
Materials Science and Engineering: R: Reports Vol.44 (2004) No.1, p.1-44
Petroleum Science Vol.9 (2012) No .4, p.544 [23] C.

The major form of defect of MMCS is the void debond between the surfaces of the metal matrix and the composite material and that between the different layers of the composite materials.
Ultrasonic Nonlinear Response of Micro-Defects Ultrasonic Nonlinearity in Solid Materials.
In fact, ultrasonic wave propagation in materials is always nonlinear.
Let’s take the simplest case of second harmonic excitation in isotropic solid materials as an example.
Acknowledgment The work is supported by National Natural Science Foundation of China.