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Since then, numerous investigations on this subject in purely elastic materials have been made.
Both Layer 1 and Layer 2 are assumed to be transversely isotopic piezoelectric materials with respect to the poling direction normal to the xy- plane.
K.Y.Lee, W.G.Lee and Y.E.Pak, Journal of Applied Mechanics, 67 (2000) p.165. 4.
J.H.Kwon and K.Y.Lee, Journal of Applied Mechanics, 69 (2002) p.55. 5.
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Materials Science and Engineering, A. 302(2001) 47-52
Materials Science and Engineering, B. 127(2006) 105-107
Journal of Materials Science. 29(1994) 525-527
Advanced Materials Research..352(2011) 239-242
Journal of Materials Research. 28(2013) 1386-1393

In recent years, due to advances in science technology, space satellites have made progress.
It is because that some materials on the surface of the rotor and stator are vapored out and the frictional force increased.
Fig. 5 Lining materials.
Fig. 6 Durability of motor with lining materials.
Table 2 Rotation speed in vacuum each lining materials [rpm] Table 3 Torque in vacuum each lining materials [mNm]. 　

Experimental Materials Butyl methacrylate (BMA), Hydroethyl methacrylate (HEMA), Lauryl methacrylate (LMA) were distilled before use; Benzoyl peroxide (BPO, recrystsllized); Poly (vinyl alcohol) (PVA).
Now we can only use the theory of crosslinking polymer or water absorbent materials.
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Use of walls of cans (waste materials fibers) in concrete reduced the strengths.
Wastes materials must be counted as valued materials just require a suitable organization and application [2, 4].
Materials and Methods Materials Cement.
Farhood " Evaluation of Suitability of Cement Mortar Including Paper Waste as Construction Materials" Journal of Green Engineering (JGE), vol. 10, issue 6, 2020
Abd-alridha "Evaluation of Using Waste of Bottles in Concrete as Sustainable Construction" Journal of Babylon University/Engineering Sciences, vol.3, issue 3, pp 97-782, 2016

Zirconia [zirconium dioxide (ZrO2)] has good mechanical properties, and its ability to undergo stress-induced phase transformation rendered it as a good additive to improve the properties of brittle materials such as HA [7].
Wang, An in vivo study of a bone grafting material consisting of hydroxyapatite and reconstituted collagen, Journal of Material Science:Materials in Medicine. 19(6) (2005) p:341-345 [5] Y.T.
Bhattacharyya, Pressureless sintering of dense hydroxyapatite–zirconia composites, Journal of Material Science: Materials in Medicine. 19(6) (2008) p:2437-2444 [7] Y.M.
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Gibson, The effect of low levels of zirconia addition on the mechanical properties of hydroxyapatite, Journal of Materials Science Letters. 20(18) (2001) p:1719-1722 [12] C.Y, Chiu, H.C.

However, due to the usage of petro-based materials in the production of phenolic resins, several approaches have been made, and one of the approaches is by substituting the raw materials, especially phenol, with lignin.
Methodology Materials.
All materials used as received without any purification.
In Materials Science Forum (Vol. 981, pp. 240-244) (2020): Trans Tech Publications Ltd
Journal of Applied Polymer Science, 135(8) (2018): 45893

Eriksen, Combined EBSD-investigations and in-situ tensile tests of a direct metal deposited Ti6Al4V-alloy, Materials Science and Engineering, 2013
Ramulu, Fatigue performance evaluation of selective laser melted Ti–6Al–4V, Materials Science and Engineering: A, 598 (2014), p. 327-337
Melz, Effect of surface roughness on fatigue performance of additive manufactured Ti-6Al-4V, in press, Materials Science and Technology, (2015)
Lee, High-cycle fatigue properties of investment cast Ti-6Al-4V alloy welds, Journal of materials science letters, 20 (2001), p. 2183-2187
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