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Preface This issue collected some selected tribology and materials research papers from the International Conference on Engineering Tribology and Applied Technology 2016 (ICETAT 2016).
At the same time, the conference represented a unique opportunity for the tribology and engineering community to present their new research results, exchange ideas and become familiar with new trends and directions in the fields of Basic Friction and Wear, Biotribology, Computer-Aided Engineering, Contact Mechanics, Dynamic and Vibration Engineering, Green Tribology and Sustainability, Lubricants and Lubrication, Material Analysis and Examination, Manufacturing Technology, Measurement and Signal Processing Technology, Micro and Nano Tribology, Surface Engineering and Coating, Tribology in Machine Elements, etc.
The papers presented in Journal of Key Engineering Materials were the selected manuscripts associated Tribology and Materials research areas from ICETAT2016.
The other manuscripts associated engineering technology were published in the other profession journals.
Committee Yunn-Lin Hwang, Jeng-Haur Horng Sponsors Ministry of Science and Technology (MOST) Taiwan Society of Tribology Technology (TSTT) National Formosa University (NFU)

Introduction Many studies have been devoted to give a good knowledge of the physical properties of polymeric materials often associated with other environmental stresses [1-3].Under service conditions, these materials are exposed to electrical fields, below the critical level required for rapid failure via an avalanche process.
Then the breakdown of these materials may occur.
Bretagne, "Quantification of Mechanical deformations induced by an electric in a semi-crystalline organic insulator, "Journal of Applied Polymer Science, Vol 93,(2004), pp. 2321-2321
Journal of Applied Sciences, 8, (2008), pp. 1206-1213
Martinez-Vega, A description of the various parameters at play during the electrical ageing process of organic insulators, Journal of Optoelectronics and advanced materials, Symposia, Vol. 1, n°5, (2009) , pp. 958-962.

UV inkjet printing as a printing method using UV ink printing via UV drying technology can print any materials with non-impact printing.
The UV inkjet prints PET bottom with white ink, then is transferred to ABS to check the materials color quality attributes.
Yeh, A Study on Color Quality Attributes of IMR between PET and ABS by UV Inkjet, Journal of CAGST 2013, Chinese Association of Graphics Science & Technology, (2013), pp.386-395
Chang, A Study on Color Print Attributes of IMR without White Ink by UV Inkjet, Journal of CAGST 2014, Chinese Association of Graphics Science & Technology, Taipei. (2014), pp.1-11
Chen, A Study on Color Print Attributes of Cerenic by UV Inkjet, Journal of CAGST 2011, Chinese Association of Graphics Science & Technology, Taipei. (2011), pp.180-191

The structures are continuum model (CM), joint interface model with different materials (JIM1) and joint interface model with same materials (JIM2).
Materials and Methods Materials The parameters and properties of materials (MAT1 and MAT2) are shown in Table 1.
Table 1: Materials’ Parameters Young’s Modulus (Gpa) Poisson’s rario Yield Strength (Mpa) MAT1 210 0.3 100 MAT2 1140 0.07 N/A FEM Model This analysis follows Mises yield criterion.
Journal of mechanical engineering. 47 (2011), 53-58
Journal of mechanical engineering.49 (2013), 108-121.

Introduction Composite materials are becoming more and more used for all kinds of purposes and one important aspect that needs to be better understood is their fatigue behavior.
The composite materials have a more complex behavior under fatigue loading.
International Journal of Fatigue 29 (2007), 158-167
Miner, Cumulative damage in fatigue, Journal of Applied.
Szekrenyes, Analysis of classical and first-order shear deformable cracked orthotropic plates, Journal of Composite Materials 48, 12, 1441, 2014

Experimental Materials.
Mansur: Biomedical Materials Vol. 2 (2007), p. 135
Mansur: Journal of Materials Science Vol. 43 (2008), p 510
Lima: Materials Chemistry and Physics Vol. 130 (2011), p. 84
In: Monographs in Oral Science H.M.

Zhang: Materials Letters Vol. 60 (2006),p. 3385
Song: Materials Science and Engineering A Vol. 487(2008), p.488
Karpat:Journal of Materials Processing Technology Vol.211(2011),p.737
[1] G.Q.Wu, H.Song and W.Sha : Materials Science and Technology Vol.27(2011),p.1777
:Materials Science and Engineering A Vol.473(2008),p.306.

World Applied Sciences Journal. 2013. 25(1).
Improvement of the effectiveness of silicate autoclave materials production using nano-dispersed modifier, Construction Materials, 9 (2008), p. 2–5 [4] Nelubova V.V., Strokova V.V., Altynnik N.I., Podgorniy I.I.
Advanced materials research. 2014. 941.
World Applied Sciences Journal. 2013. 24 (11), pp. 1519-1524
Series: Materials Science and Engineering 96 (2015) 012010

Therefore we can use the different cylinder structures to improve the stress distribution around inner cylinder walls instead of using high strength materials.
The above structure has many advantages which is easy manufacturing, common materials and lightweight [22,23].
Taking full advantage of the respective characteristics of different materials; Using high strength materials to make the inner cylinder and using lower strength materials to make the outer cylinder.
Shen, A filament-wound structure technology overview．Materials Chemistry and Physics. 42(1995)96-100
Fatigue life prediction of autofrettage tubes using actual material behaveour, International Journal of Pressure Vessels and Piping. 83- (2006)749-755

Electrochromic materials can change their optical properties reversibly with an applied potential due to electrochemical oxidation and reduction.
Polyaniline has emerged as one of the most promising class of active materials for electrochromic devices, due to its high capacitive characteristics [4], easy processing, low cost and environmental stability [5].
CNTs were discovered by Iijima in 1991 [11] and is a very promising materials for application that requires good electronic, mechanical and thermal properties.
Cruz-Silva: Solar Energy Materials & Solar Cell Vol. 91 (2007), p. 1444
Cech: Journal of Applied Physics Vol. 101 (2007), p. 016102 [9] Z.