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Constraint equation of saturation (10) Capillary pressure equation: , (11) 4 Finite element Mathematical analysis of permeable rock media stress and strain 4.1 Finite element model, material parameters and loading program In order to study to study the stratum material stress deformation that is influenced by the pore fluid nearby borehole, machanical performance parameters of finite element computation model and soild phase stratum media are modified slightly on the basis of literature [7],as shown in table 1.
Journal of rock mechanics and engineering, 2005, 24(24): 4594-4602 [3] Song Shaoyun, The synergy of field coupling problem solving method research and application[D] .
Huazhong university of science and technology, 2007 [4] Zhao Yizhong, Cheng Yuanfang, Zi Qingong, et al.
Fluid-solid coupling simulation of deliverability of screening out fracturing under influence of multiple factors[J].Journal of Liaoning Technical University(Natural Science), 2009, 28(Suppl): 54-57.
Journal of da qing petroleum institute, 2002, 26(3): 29-32 [7] Xue Shifeng.

Owing to the evaporation of harmful lead oxide during preparation process causes a crucial environment problem, so there is an increasing demand for environmental-friendly materials to replace Pb-based materials.
Zhou, Piezoelectric properties of Mn-doped (Na0.5Bi0.5)0.92Ba0.08TiO3 ceramics, Materials Letters. 59 (2005) 1649-1652
Damjanovic, High-Strain Lead-free Antiferroelectric Electrostrictors, Advanced Materials. 21 (2009) 4716-+
Messing, et al., Epitaxial growth of anisotropically shaped, single-crystal particles of cubic SrTiO3, Journal of Materials Research. 15 (2000) 846-849
Zhou, Synthesis of micron-scale platelet BaTiO3, Journal of the American Ceramic Society. 90 (2007) 1323-1326

Chen: Mining Science and Technology (China).
Wang: International Journal of Roc k Mechanics and Mining Science.
Wang: Journal of China Coal Society.
Zhang: Journal of China University of Mining & Technology.
Tan: Chinese Journal of Rock Mechanics and Engineering.

Limited researches have been made to investigate the mechanical properties of the cellular materials with density gradient.
International Journal of Impact Engineering 1997; 19(5-6):531-70
Materials Science and Engineering: A 2008, 499: 434-439
H., Lambros J., “Numerical Calculation of Stress Intensity Factors in Functionally Graded Materials”, International Journal of Fracture, Vol. 104, No. 2, pp. 131-143, 2000
International Journal of Solids and Structures 2007, 44: 4053-4067

Wang: Journal of Magnetism and Magnetic Materials. 323 (2011) 2648-2651
Li, et al: Materials Letters. 81 (2012) 65-68
Wang: Journal of Materials Processing Technology. 212 (2012) 1941-1945
Wang: Materials letters. 91 (2013) 150-153
Lu, et al: Materials Letters. 137 (2014) 475-478

Wang: Journal of Materials Processing Technology, vol. 185 (2007) pp. 147-151
Spigarelli: Key Engineering Materials, vol. 344 (2007), pp. 31-38
Gabrielli: Key Engineering Materials, vol. 344 (2007), pp. 55-62
Son: J. of Materials Processing Technology, vol. 97 (2000), pp. 88-94
Simoncini: Materials Science Forum, vols. 604-605 (2009) pp. 379-387.

In Vivo Study of Carbon Artificial Femoral Head Lan Chen1, a, Xiaobing Yuan1, Hongwei Sun2, Mingzhao Chen3, Deben Zhao3, Dan Yu3 and Yiwang Bao4 1 School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, No.516 Jun Gong Rd., Shanghai 200093, China 2 Yangpu Geriatric Hospital, Shanghai 200093, China 3 Orthopedics Department, Jilin Central Hospital, Jilin 132011, China 4 China Building Material Test & Certification Center, China Building Materials Academy, Beijing 100024, China a lanchen@usst.edu.cn Keywords: Carbon prosthesis; Femoral head; Cartilage; Biocompatibility Abstract.
The results proved that the coating material of the femoral head was biocompatible and the neocartilage tissue around the prothetic head might protect the acetabulum from wear.
The essence problem of hemiarthroplasty is the inevitable acetabular cartilage wear [3] which is due to the poor biocompatibilities or mechanical compatibilities of the prothetic head materials.
Materials and Methods Materials and animals.
Hetherington: the Journal of Foot and Ankle Surgery Vol. 32 (1993), p. 490

That is why some mechanical properties connected to the materials behavior under dynamic load were examined.
The increase of rhenium content improves the strength as well as plastic properties of the examined materials.
During the further investigation the materials containing more than 10% rhenium content should be tested.
Moreover ballistic tests should be carried out to determine the possibility of using these materials for kinetic energy penetrators.
Ryu, Combination of mechanical alloying and two-stage sintering of a 93W-5,6Ni-1,4Fe tungsten heavy alloy, Materials Science and Engineering A 344 (2003) pp. 253-260

The ideal elastic-plastic model provided by [FEM] software ABAQUS is used to simulate steel material.
In the analyzing process, both material and geomerical nonlinearity is assumed.
Journal of Structural Engineering ASCE, 1995, 121(3): 458- 467
China Civil Engineering Journal, 2008, 41(7):48-54
Journal of Yantai University (Natural Science and Engineering Edition), 2009, 22(4): 312-320 [7] Uy B.

According to the actual positioning stage, the materials of the primary stage and the secondary stage are called ZTC4 and 4J36, respectively.
Janocha: Inverse feedforward controller for complex hysteretic nonlinearities in smart-material systems.
International Journal of Machine Tools & Manufacture Vol. 43 (2003), p. 1177 [3] Lu Lihua, Liang Yingchun and Guo Yongfeng: Design and testing of a nanometer positioning system.
Journal of Dynamic Systems, Measurement and Control Vol. 132 (2010), p. 021011 [4] J.
Journal of Vibration and Acoustics Vol. 128 (2006), p. 88 [5] Hao W, Zhang HT, Guo QJ et al: Thermal error optimization modeling and real-time compensation on a CNC turning center.