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Stressand can be expressed: 　　　　　 (3) Among, is Modulus of elasticity of materials.
The maximum residual tensile stress occurred at about 1/8 the plate thickness from the center, the maximum compressive stress occurred at about 1/5 the thickness from the surface layer, which can be attributed to the solute distribution during solid solution treatment of the core material and the solute depletion of surface materials caused by enrichment [6].
Journal of Air Force Engineering University (Natural Science Edition), 2001, 2(5): 1-3
International Journal of Machine Tool & Manufacture, 2001, 41:443-450
Method of Measuring the Residual Stress Distribution in Pre-stretched Aluminum Alloy Plate 7075T7351 [J].Journal of Air Force Engineering University (Natural Science Edition), 2004, 5(3):19-21.

They display a wide range of applications in different fields, e.g. in cosmetics, agriculture, food, pharmacy, biomedical, paper industry and also as absorbent materials for wastewater treatment [6, 7, 8].
Material and methods Raw Materials: Shrimps were taken from the local fish market for this project.
Ruban, Isolation of Chitin From a Variety of Raw Materials,Modification of The Material, and Interaction Its Derivatives With Metal Ions, Chromatographia. 59 (2004) 783–786
Aiba, Chemistry Modified Chitin and Chitosan as Biomaterials, Progress in Polymer Science. 29 (2004) 887–908
Roy, Preparation of Chitosan From Shrimp Shell and Investigation of Its Proteries, International Journals of Basic & Applied Sciences. 11 (2011) 116-130

Carol, No. 2, 130024 Targoviste, Romania 2Faculty of Materials Science and Engineering, University POLITEHNICA of Bucharest, 313 Splaiul Independentei, sector 6, 060042 Bucharest, Romania apinicoleta24@yahoo.com, b cristiana_enescu@yahoo.com, c vasilebratu.uvt_ro@yahoo.com, dralucaza@yahoo.com, eelenastoian22@gmail.com Keywords: aluminium alloys, heat treatment, corrosion, mechanical test.
Introduction In recent decades the scientists increasing efforts to develop light weight materials for transportation with low environmental impact.
These types of materials include aluminum alloys, titanium alloys or composite materials that ensure reduction of fuel consumption and implicit gas emissions into the atmosphere [1-5].
Rosso, Metallurgical Science and Technology (2011), pp.5-13
Actis Grande, M Rosso, Corrosion resistance of sintered duplex stainless steels in the salt fog spray test, Journal of Materials Processing Technology 192–193, (2007), pp.443–448

China 2School of Sciences, Zhejiang University of Science and Technology, Hangzhou Zhejiang 310023, P.R.
[J] Journal Ningxia Univrsity，1996,17(3):34～38
Journal of Membrane Science 2008
Journal of Polymer Science Part B: Polymer Physics. 1992;30:231
Journal of Polymer Science Part B: Polymer Physics. 1987; 25:855.

Jawahir, Contour finish turning operations with coated grooved tools: Optimization of machining performance, Journal of Materials Processing Technology 209 (1) (2009) 332-342
Lee, Effectiveness of various coatings on cermet cutting tools, Journal of Materials Processing Technology 58 (4) (1996) 368-373
Yang, Dynamic analysis of a rotating beam subjected to repeating axial and transverse forces for simulating a lathing process, International Journal of Mechanical Sciences 51 (3) (2009) 256-268
Journal of Research and Development in Mechanical Industry 7 (1) (2015)
Journal of Research and Development in Mechanical Industry 7 (1) (2015).

Ahmad1 1Structural Materials Niche Area, School of Materials and Minerals Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang.
Materials Science and Engineering: B, 177(9), 673-677
Materials Chemistry and Physics, 115(2), 585-589
Chiang Mai Journal of Science, 41 (2), 453-446
Materials Science and Engineering: B, 99(1), 294-297.

Introduction With the development of eco-materials, high-performance concrete (HPC) has become an attractive issue of structural engineering materials.
Experimental Materials.
Reference cement and commercial liquid PCE was supplied by China Building Materials Research Institute (Beijing, China).
Construction and building materials, 2016, 105: 545-553
Chinese Journal of Colloid & Polymer, 2004, 23(4): 12-15.

Thermal properties of main materials are shown in table 2.
Journal of Chongqing Jianzhu University, Vol.17(2), (1995),P.23-30.
Journal of Chongqing Jianzhu University, Vol.18(3), (1996), P.1-7.
Journal of Chongqing Jianzhu University, Vol.19(5), (1997), P.107-111+130.
China Safety Science Journal, Vol.1(16), (2006), P.88-92.

Finite Element Model At first, we define materials of blade in metallography Lab.
According to test result, the blade material was a Steel-based alloy known as X15Cr13 with the mechanical specification that is presented in Table 1.
References [1] Mohammad Vaezi, Masoud Soleymani,: Journal of Applied Sciences, Vol. 9 (2009), p. 1950 [2] Arash Rahmani, Ghiam Eslami, Ramin Soliemani,: Life Science Journal, Vol. 10 (2013), p. 546 [3] Z.
Al-Qaisia,: Journal of sound and vibration, 2005, Vol. 282 (2005), p. 1065 [5] Gareth L.
Tejeda,: Engineering Failure Analysis, Vol. 35, (2013), p. 562 [8] Gwo-chung Tsai,: Journal of sound and vibration, Vol. 271 (2004), p. 547 [9] E.

Mechanical Engineering Science [3] Chao,B.T. and Trigger,K.J: Trans.ASME,1958,80(1),311-320
Erdem Alaca: Journal of Materials Processing Technology 183 (2007) [5] A.J.R.Smith,J.A.Armarego, Annals of CIRP,1981
Dinc: Journal of materials processing technology 1111-1121
[9] Komanduri, R: International Journal of Mechanical Sciences 42(9): 1715-1752
Elbestawi: International Journal of Machine Tools & Manufacture 47 (2007) 263-272.