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The materials of casing materials and the inner pressure should be appropriately controlled to control the propagation of cracks.
To solve this problem, plastic extension analysis of casing with the radial bitten cracks was carried out under inside pressure by fracture mechanical theory, that is, it studied instability extension of bitten crack on casing under inside pressure, in order to guide the designing of casing strings and optimization of casing materials, ensure casing near slip safe and reliable.
[2] Yongxing Sun, Taihe Shi, Yuanhua Lin: Petroleum Drilling Techniques, Vol. 37-6(2009), p. 14. ( in Chinese) [3] Tianhan Xu, Yaorong Feng, Shengyin Song: Materials for Mechanical Engineering, Vol. 34-1(2010), p. 15. ( in Chinese) [4] Tiejun Lin, Zhanghua lian, Xiaojian Zeng: Journal of Chongqing University, Vol. 33-7(2010), p. 15.
(in Chinese) [5] Tianhan Xu, Yaorong Feng, Shengyin Song: Materials for Mechanical Engineering, Vol. 33-11(2010), p. 15. ( in Chinese) [6] Xiang Xu, Yaming Zhang,Yan Zhou: Corrosion&Protection, Vol. 32-3(2011), p. 13. ( in Chinese) [7] Jiahua Pan.
Pipeline science report on science and technology. oil and gas pipelines technology editorial office(1980)

Journal of magnetism and magnetic materials, Vol. 313 (2007), p. 29-36
Materials.
Science. and Engineering.
Nanocrystalite Materials.
Chen, Journal of Hazardous Materials.

Han: Materials Science Forum, v. 408-412, 2002, p. 1245
Matsumoto: 6th International Conference on Texture of Materials.
Masui: Materials Transactions, JIM, v. 35, 1994, p. 679
Bate: Metal Science, v. 18, 1984, p. 64
Lahn and D Raabe: Journal of Magnetism and Magnetic Materials, v. 304, 2006, p. 183.

In Ref. [4], a constitutive model of giant magnetostrictive material refered to density and internal resistance of the material was induced, and an equivalent mechanical model was established.
With density, equivalent internal resistance, equivalent stiffness and effect of material accounted, constitutive equation of giant magnetostrictive material is[4,5,9]
References [1] ZHU Yu-chuan, MA Da-wei, LE Gui-gao, et al: Experiments and Measurements In Fluid Mechanics Vol. 18 (2004) No.4, pp. 20-23 [2] GUO Dongming, YANG Xing, JIA Zhenyuan , et al: China Mechanical Engineering Vol. 12 (2001) No.6, pp. 724-727 [3] HOU Shu-ping, YANG Qing-xin, CHEN Hai-yan, et al: Ordnance Material Science and Engineering Vol. 31 (2008) No.5, pp. 95-98 [4] Cao Shuying: Dynamic model with hysteresis nonlinearity and control technique for giant magnetostrictive actuator (Ph.D., Hebei Universty of Technology, China 2004), pp. 11-16 [5] Sun Huagang: Study on Dynamic Characteristics & Simulation of Giant Magnetostrictive Actuator (Ph.D., Northeastern University, China 2005), pp. 101-111 [6] Yuan Huiqun, Li Dong, Sun Huagang: Journal Of Rare Earths Vol. 25 (2007) No.4, pp. 236-239
Vol. 1, pp. 667-672 [9] Xiaojing Zheng.Le Sun: Journal of Magnetism and Magnetic Materials Vol. 309 (2007), pp. 263-271 [10] Sun Le.
The Study of Constitutive Theory for Giant Magnetostrictive Materials (Ph.D., Solid mechanics of Lanzhou university, China 2007), pp. 17-33

Introduction As a result of their high specific stiffness and strength, fibre-reinforced composite materials are used more and more in many areas.
In: Damage in composite materials(Ed.Reifsnider K L.), ASTM STP 775, American Society for Testing and Materials(1982), p.103-117 [2] Manders P W, Chou T W, Jones F R.
Journal material science(1983), p.2876-2889 [3] Talerja R.
Fatigue of composite materials.
International Journal of Fatigue(2002), p.119-125 [5] S.Leigh Phoenix and Howard M.Taylor.

Material and Methods 1.1 Material The rice variety for the test is Dongnong 428; Fertilizers for the test are as follows: urea (N: 46%), diammonium phosphate (N: 18%, P2O5:18%), potassium sulphate (K2O: 30%). 1.2 Method The test of 2011 was carried out in Heilongjiang province academy of agricultural sciences experimental zone for democracy in Daowai district of Harbin city by using regional experimental method.
The Effect of Stubble Return on Agro- ecological System and Crop Growth [J].Chinese Journal of Soil Science, 2001,32(5): 209-213
Journal of An hui Agri Sci, 2009, 37(4):1641-1643
Effects of Amount of N-applied on Grain Yield and Quality of Rice[J].Journal of Shenyang Agricultural University, 2006,37(5):688 -692 [14] Chen jia-bin, lin gang, zhao de-ming, et al.
Modern Agricultural Science and Technology, 2012, (21): 23-24+26

The material of the elastic Element is 17-4PH, which is a kind of stainless steel.
Journal of Elect rochem.
Electronic thin film materials [M].
Beijing, Science Press, 1990, 112 -113
Vacuum Science and Technology, 1998, (3):161-169

The material of workpiece was A3 steel, and workpiece was bolted on the dynamometer.
A3 Steel Material 2.
Acknowledgments The authors acknowledge the National Natural Science Foundation (50975053) for supports.
References [1] Kim Seoqqwan, Klamecki B.E.: ASME Jounral of Manufacturing Science and Engineering Vol. 119 (1997), p. 118-119
Ber: International Journal Advanced Manufacturing Technology Vol. 13 (1997), p. 17-26

The kinetic analysis of carbide lime reaction based on multi-heating rate method Guan Duojiao1, a, Xu Youning1, Cai Jiuju2, Sun Wenqiang2, Zhao Hai1,b 1 Shenyang City Key Lab of Circulation Fluid Bed, Shenyang Institute of Engineering Shenyang City, Liaoning Province, China 2College of Materials and Metallurgy, Northeastern University Shenyang City, Liaoning Province, China a silver_gdj@163.com, b ynf_126@qq.com Keywords: carbide lime; thermo-gravimetric; thermal decomposition; multi-heating rate Abstract.
Introduction The material studied in this paper was carbide lime which is industrial waste obtained from the production of PVC.
[2] Perez-Maqueda L A，Criado J M and Goto F J, “Advantages of combined kinetic analysis of experimental data obtained under any heating profile,” Journal of Physical Chemistry，2002，106(12): 2862-2868
[8] Zheng Ying，Chen Xiaohua，Zhou Yingbiao and Zheng Chuguang, “The decomposition mechanism of CaCO3 and its kinetics parameters,” Journal of HuaZhong University of Science & Technology： Nature Science Edition，2002，30(12)： 86-88
[9] ˙Irfan Ar, Gül¸sen Do˘gu, “Calcination kinetics of high purity limestones,” Chemical Engineering Journal 83 (2001) 131–137.

(3) where is spalling strength of the materials.
According to the waveform, amplitude and different spall strength of the materials, fracture of the specimen may be caused many times.
Progress in Material Science Vol. 28 (1983), p.1
Mariotti: Mechanics of Materials Vol. 33 (2001), p. 33
Li, C.H.Wei and L.Zhu: Journal of Building Materials Vol. 11 (2008), p. 710.