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Introduction PP is one of the most popular thermoplastic polymer materials currently.
Experimental Materials.
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Mongkolwongrojn: Analysis of Two Surfaces in line contact under TEHL with Non-Newtonian Lubricants, Applied Mechanics and Materials, Vol. 148-149 (2012), pp.736-742
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Javadi and M.Tajdari: Experiment investigation of the friction coefficient between aluminium and steel, Materials Science-Poland, Vol. 24 (2006), pp. 305-310.

Feng: Journal of Hazardous Materials Vol. 164 (2009), p. 615
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Current Opinion in Solid State and Materials Science,5:39 -44
Journal of Materials Science: Materials in Electronics, 2019. 30(4): p. 4079-4084
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The main processing object is the nonlinear optical material, KDP crystal [16].
The material properties are indicated in Table 1.
Table 1 Material properties Part Material Density (t/mm3) Elastic modulus (MPa) Poisson's ratio spindle, tool steel 7.8× 10-9 2.1× 105 0.3 bed, guide, table marble 2.6× 10-9 0.55× 105 0.27 Considering the micro vibration amplitude, material nonlinearity can be neglected for the small deformation.
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Lu: Experimental Modal Analysis and Application (China Science Press, Beijing 2001) [19] DE Nuland.

The bridge life was divided into 5 stages: bridge design, raw materials processing, construction, operation, and demolition.
Results show that major environmental impact appears during raw materials processing and construction.
Negative environmental impacts mainly show in the raw materials production stage, the construction stage and the abandonment stage, the fuzzy comprehensive evaluation scores of which are 40.03, 49.75 and 54.4. 
Journal of Tsinghua University（Science and Technology），2006，46（12）：1953-1956（in Chinese） [4] Wang Xian’en，Zhang Haihua，Zhao Wenjin，et al.
Journal of Jilin University（Science Edition），2006，44（1）：137-141（in Chinese） [5] Toshiharu ikaga, and simultaneous evaluation of LCA﹒ LCC tool of buildings in the country and local governments and enterprises on the application situation [J].  

Introduction The theory of viscoelastic foundation beam can describe the physical nature of materials better than the theory of elastic foundation beam, and some important mechanical phenomena such as structural creep, relaxation and damping can be reflected in static and dynamic research[1], so the theory of visco- elastic foundation beam is more and more valued by people.
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[7] Honghu Zhu,Linchao Liu,Xiaowei Ye.Journal of Basic Science and Engineering,Vol.2(2011), p.217.

Materials and Methods 2.1.
Specimen preparation for fatigue tests from difficult to machine high strength materials is usually a laborious process.
Pang; S.X.Li, Z.G.Wang, Z.F.Zhang; General relation between tensile strength and fatigue strength of metallic materials; Materials Science and Engineering: A; Volume 564(1); March 2013; doi: 10.1016/j.msea.2012.11.103 [4] Zuheir Barsoum; Guidelines for Fatigue and Static Analysis of Welded and Un-Welded Steel Structures; KTH Royal Institute of Technology; Stockholm; TRTA-SCI-RAP; 2020; ISBN 978-91-7873-478-8 [5] U.
Szabó; The effect of the filler material choice on the high cycle fatigue resistance of high strength steel welded joints; Scientific.Net; Material Science Forum; Volume 885; February 2017; doi: 10.4028/ www.scientific.net/MSF.885.111 [19] Ambuj Saxena, A.
Ramachandran; Study of free undamped and damped vibrations of a cracked cantilever beam; Journal of Engineering Science and Technology; Volume 13 (2); February 2018; ISSN 1823-4690 [50] V.

Journal of Intelligent Material Systems and Structures. 20 (2008) 39–49
Journal of Intelligent Material Systems and Structures, 19 (200) 1217–1228
Smart Materials and Structures, 13 (2004) 609–620
Smart Structures and Materials, 10 (2004) 820–831
Journal of Intelligent Material Systems and Structures, 21 (2010) 321–335

The materials to be machined were type of a cast iron GTW 35-04.
In Development of mechanical engineering as a tool for the enterprise logistics progress : science report : project CII-PL-0033-01-0506, Poznan University of Technology, ISBN 83-89873-28-1, pp.187-192, (2006) [5] J.Jurko-M.Džupon-A.Panda-M.Gajdoš-I.Pandová, Deformation of Material Under the Machined Surface in the Manufacture of Drilling Holes in Austenitic Stainless Steel.
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