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The absolute values of the three directions principal stress in the cylinder wall place are larger than or equal to other position of cylinder,Therefore, the cylinder wall is risk place of the entire cylinder.Adopt maximum strain energy theory which is the fourth strength theory.For a variety of high-strength ductile materials used currently，role in cylinder on the wall for the equivalent stress is[5]: (5) When equivalent stress less than the allowable stress materials, materials keep elastic deformation.
cylinder,then this very non-uniform stress distribution will greatly limit the carrying capacity of the cylinder.On the other hand, if we make for cylinder reach the carrying capacity, which will inevitably lead to material waste and improve the cost of the cylinder.Therefore,when the K value of thick-walled cylinder is larger, two-layer structure and high-strength material can be used to make into thin inner sleeve, and jacket part using inexpensive low-strength materials.
Xiangtan University,Natural Science Journal, 1999, 9, 21, No. 3, 79 - 83
[5]Zhang Yuxian,Wang Hong,Chen Shude.Discussion about calculating optimum elastic-plastic interface radius[J],Journal of Chongqing University(Natural Science), 2004,6,27, No. 6, 30-40
[6]Wu Jingdong,Li Xin,Yuan Zhongda.Unified solution of thick-walled cylinder limit pressure analysis[J],Journal of shenyang institute of chemical, 2002.6, 16 (2), 134 ~ 136.

According to the results, there are presented recommendations for the applicability of the tested polyamide material.
The studies related to the friction coefficient of the polyamide – steel type contacts are mainly oriented to the lubricated contacts due to the wide area of applicability of these materials in power transmissions [1, 2, 3, 4, 5].
The polyamide materials are produced by Schaeffler Group and their mechanical properties, due to confidential reasons of the company, are not public information.
Fig. 7. – The relative percentage variation of the friction coefficient for the polyamides / steel type contact, related to 30 oC Summary The testing equipments and the testing procedure presented in the paper are suitable to be applied in any testing which has the aim to determine the variation of the friction coefficient with the rotational speed and the temperature for different materials being in contact.
Lecompte, An experimental analysis of fracture mechanics of short glass fibre reinforced polyamide 6.6 (SGFR-PA66) in Journal of Composite Science and Technology, nr. 69, (2009), 2521 – 2526

Materials Science and Technology, (9)(1985), p. 95 (In Chinese)
Journal of Materials Processing Technology, Vol.157-158 (2004), p. 131
Chinese Journal of Mechanical Engineering, Vol.19(2)(2006) , p. 272. [8] Z.B.
Chinese Journal of Mechanical Engineering, Vol.30(5)(1994) , p. 47 (In Chinese)
Journal of University of Science and Technology Beijing, Vol.30(9)(2008) , p. 1042 (In Chinese).

Cheng2 and Mohd Afendi2 1Unit PenyelidikanTeknologiSukanPermotoran, MOTECH (MotorSport Technology Research Unit), Universiti Malaysia Perlis (UniMAP), Pauh Putra Campus, 02600 Arau, Perlis, Malaysia 2School of Mechatronic Engineering, Universiti Malaysia Perlis (UniMAP), Pauh Putra Campus, 02600 Arau, Perlis, Malaysia 3Department of Environmental and Occupational Health, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia 4Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia 5Department of Mathematical Sciences, Faculty of Science and Technology, UniversitiKebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia 6Centre of Excellence for Unmanned Systems (UAS), Universiti Malaysia Perlis, Malaysia *shahriman@unimap.edu.my Keywords: Ergonomics, Machine Design, Oil Palm, Human Machine Interaction, CAD Abstract
Back pain are commonly associated with manual material handling such as lifting loads that are present in Fig. 3 [15, 16].
Kumar, "Anthropometry of the Singaporean and Indonesian populations," International Journal of Industrial Ergonomics, vol. 40 (2010) 757-766
Part 2: Wheelbarrows," Journal of Agromedicine, vol. 14, (2009) 44-57
Chaffin, "Manual materials handling and the biomechanical basis for prevention of low-back pain in industry--an overview," Am Ind Hyg Assoc J, vol. 48 (1987) 989-96

Acknowledgements The Ministry of Science, Technology and Innovation of Malaysia is gratefully acknowledged for the grant under IRPA vote: 03-02-04-0374-SR0003/07-07.
Structural, Magnetic and Magnetoresistive Properties of La0.7Sr0.3-xNaxMnO3 Manganites, Journal of Physics: Condensed Matter, 13; 449-458
Keller, Role of the A-Site Cations on the Magnetic Structures and Transport Properties in the Nd0.7Ba0.3-ySryMnO3 ( 2.00  y ) Perovskite, Journal of Magnetism and Magnetic Materials, 264 (2003) 221-233 [7] M.
Structural, Magnetic and Magnetoresistive Properties of La0.7Sr0.3-xNaxMnO3 Manganites, Journal of Physics: Condensed Matter, 13, 449-458
Development of Pulsed Magnetic Field and Study of Magnetotransport Properties of K-Doped La1-xCax-yKyMnO3 CMR Materials, Journal of Magnetism and Magnetic Materials, 269: 359-371 [12] Ziese, M., 2000, Spontaneous Resistivity Anisotropy and Band Structure of La0.7Ca0.3MnO3 and Fe3O4 Films, Physical Review B, 62: 1044 [13] Rana, D.S., Thaker, C M, Mavani, K R, Kubekar, D G, Kundaliya, D C and Malik, S K, 2004.

Materials and Methods Preparation of samples.
Salman and M, Leite: submitted to Journal of Composites Science (2018) [4] M.R.
Sitti Fatimah: submitted to ARPN Journal of Engineering and Applied Sciences (2017) [6] M.
Saurabh, M .Hazwan Hussin and H.P.Abdul Khalil: submitted to In Materials (2016) [8] D.Grosser and W.
Atandas :submitted to Case Studies in Construction Materials (2015) [10] J.E.

Introduction: Piezoelectric materials are increasingly used in smart structures as sensors and actuators [1].
These materials develop an electric potential with the application of mechanical pressure, which allows piezo materials to be used as sensors.
Actuation is based on the converse effect, in this effect these materials produce mechanical strain with the application of electric potential.
F., "On the Nonlinear Equations of thermo-electro-elasticity," International Journal of Engineering Science, Vol. 9 (1971), pp. 587
S., and Venkatesan, C., "Electro-thermo-elastic Formulation for the Analysis of Smart Structures," Smart Materials and Structures, Vol. 15 (2006), pp. 401

For the flow field at, the MR material behaves like a solid.
References [1] J M He, J Huang, and C Liu: Advanced Materials Research Vols. 97-101 (2010) pp 875-879 [2] Carlson J.D: Journal of Intelligent Material Systems and Structures Vol. 13 (2002), p. 431-435 [3] Ikhouane Fayçal, Dyke Shirley J: Smart Materials and Structures Vol. 16 (2007), p. 605-616 [4] Xue Xiaomin, Sun Qing, Zhang Ling, et al: Journal of Intelligent Material Systems and Structures Vol. 20 (2009), p. 2089-2100 [5] Kyoung Kwan Ahn, Dinh Quang Truong, Muhammad Aminul Islam: Journal of Mechanical Science and Technology Vol. 23 (2009), p. 1485-1499 [6] Eduarda Costa, P.J.
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Ordnance Material Science and Engineering, 2006, 29(2): 66-69
Chinese Journal of Materials Research, 2009, 23(2): 211-214
Journal of Composite Materials. 2003, 15(8): 6-20
Journal of Inorganic Materials, 2015, 30(12): 1283-1290
Journal of Inorganic Materials, 2015, 30(12): 1283-1290

As a result the polishing temperature could be reduced to 324~360℃ with the max MRR (material removal rate) of about 2.3µm/h.
It indicates that the friction plays an important role in the material removal.
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