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The damage can quickly grow through the taped region and can reduce the strength of materials.
Thomas[3] uses linear elastic fracture mechanics, combined with simple strength of materials theory, to predict the axial tensile load that will cause delamination in a tapered laminate of known geometry and material properties.
References [1] Obrien TK, in : Damage in composite laminate materials, edited by Reifsnider TK, ASTM STP 775.Philadelphia(PA): ASTM, 140-67(1982)
AIAA/ASME/ASCE/AHS 32nd Structures, Structural Dynamics and Materials Conf.
[5] Vizzini AJ: Journal of Reinforced Plastics and Composites Vol.16(1997), p.73

The performance of LEFP is affected by the shapes, sizes and materials of liner which is the core part of LEFP.
The shell material is 45 steel, the liner caliber is d and charging caliber is D.
Journal of Applied Physics.1987, 61(11):4976~4985
Journal of Materials Science.1984, 19(9):3049~3058
Explosion and Shock Waves, 1988, 8(4):316~322(In Chinese) [9] Ruijun Gou, Forming Mechanism of Linear Explosively Formed Penetrator, Nanjing University of Science & Technology, (2007) (In Chinese).

Introduction Continuous research and development has resulted in new materials that are hard to machine, such as metal alloys, titanium carbides and high-speed steel.
Some greater brittleness materials, like ferrites, silicon and glass are also difficult to machine.
In order to machine the materials, some special machining techniques like ultrasonic machining (USM) are introduced [1, 2].
References [1] Lin Y., Yan B., Chang Y., 2000, Machining characteristics of titanium alloy (Ti-6Al-4V) using a combination process of EDM with USM, Journal of Materials Processing Technology 104 (2000) 171-177
[2] Nikhil churi, Rotary ultrasonic machining of hard-to-machine materials [D], Kansas State University, 2010

Natural fibers such as flax, hemp and jute are some of the most common reinforcement material for composite fiber.
This phenomenon is closely related to the decreasing hydrophobic properties of fibers and promotes reactions of polymerization of the two materials components.
Composites: Applied Science and Manufacturing , 35, pp. 371-376
I.N.G., Pratikto., Suprapto W.,( 2015), Effects of Sugar Palm Fiber Immersed In Sea Water Toward the Fiber Tensile Strenght As A Composite Strengthen, International Journal of Applied Engineering Research 10 (7) pp 17037 – 17045
Watts, (2005), The Morphology and Topography of Polymer Surfaces and Interfaces Exposed by Ultra-low-angle Microtomy, Journal of Materials Science 40. pp. 285-293.

Fig. 1 Grid division 2.2 Material attribute, experimental parameters and boundary conditions Using aluminum as the workpiece materials, H13(4Cr5MoSiV1) the stir-welding head material, The coefficient of friction between them set to 0.17[9].
Table 1 lists the performance of the two materials[9].
Acknowledgements The authors would gratefully thank for the Youth Science and Technology Fund of Sichuan Province (No.2011JQ0039), the Talent Fund of Xihua University (No.R0920203), and the Science and Technology Fund of Ministry of Human Resources and Social Security of the P.R.
Welding Journal, 1997(9)：55-59
Kovaccvic, International Journal of Machine Tool&Manufacture, vol.43, pp.605-615, 2003

It is the most popular way to strengthen glass because of the low cost of the materials, the simplicity of the necessary equipment and the ease of the processing [2].
Sada, A trip in the history and evolution of ion-exchange process, Materials science and engineering B. 149 (2008) 112-117
[3] Zhenlin Wang, Chemical tempering process and characterization of Na-Ca-Si glass, Advanced Materials Research. 239(2011) 1809-1812
Stress relaxation of ion exchanged float aluminosilicate glass at different temperature, Advanced Materials Research. 650(2013) 216-219
Fossa, Physical properties of silicate glasses doped with SnO2, Journal of Non-Crystal Solids. 351(2005) 3870-3878

Santos 2,3 1 Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China, wengwj@zju.edu.cn 2 FEUP - Faculdade de Engenharia da Universidade do Porto, DEMM, Rua Dr.
An approach to overcoming this limitation is the combination of polymers with the ceramics to form composite materials [1,2].
Materials and methods HA was prepared by a precipitation method at 40 o C using reagent grade Ca(OH)2, (NH4)2HPO4 as the starting materials, then the HA precipitates were heat-treated at 800 o C for 3h.
Acknowledgments The authors would like to thank the research fund of Science and Technology Department of Zhejiang province, China (11106225) and the FCT for the financial support through the project entitled "Interactive calcium-phosphate based materials prepared by post-hybridisation and in situ hybridisation", Ref.
Hench: Journal of American Ceramic Society, 81(1998), p.1705 [2] M.

Wu: Journal of Shenyang Jianzhu University (Natural Science) Vol.24 (2008), p. 252 (in Chinese) [8] W.
Nicholas: Journal of Engineering Mechanics Vol.117 (1991), p. 2286 [9] W.
Zhang: Journal of Engineering Mechanics Vol.119 (1993),p. 145 [11] S.
Hogan: Journal of Engineering Mechanics Vol.120 (1994), p. 11 [12] Y.
Lin: Journal of Ho-hai University (Natural Sciences) Vol.4 (1982), p. 71(in Chinese)

The dynamic failure mode of material loose and fatigue cracking is obvious in the previous damage phenomena.
The reason is that the material pressed will move the two sides and the depth part.
Lu: Science in China Series E: Technological Sciences, vol.52, 3(2009), p.721 [2] S. h.
Richard Kim: Journal of Civil Engineering, vol.10, (2), p.97 [3] Y.
Shane Underwood, et al: Journal of Civil Engineering, vol.12, (2), p.109 [4] Cherif Asli, Z.

Narrow manufacturing resources mainly refer to the material elements needed to manufacture one component.
Being the bottom manufacturing resources in a manufacturing system, narrow manufacturing resources include machine, tools, fixtures, gauges and materials and so on.
Acknowledgement This research is supported by the Science and Technology Development Program of Shandong Province (No. 2010GGX10408).
Sheng: Journal of Wuhan Automotive Polytechnic University, Vol.22 (2000) No.2, pp. 19-21 ( In Chinese)
Ge: Journal of Jiangsu University of Science and Technology (Natural Science Edition), Vol. 21 (2007) No.2, pp.85-89 ( In Chinese).