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The fracture mechanics parameters of materials are important data for numerical calculation during the structural design [1-3].
Note that in composite structures and materials, the weakest part is often the interface between different materials.
Tschegg, Fracture energy of natural fibre reinforced concrete, Construction and Building Materials, V. 40 (2013) p. 991-997 [4] S.
Seitl, Accurate description of near –crack-tip fields for the estimation of inelastic zone extent in quasi-brittle materials, Key Engineering Materials, Vs. 525-526, (2012), p. 529-532 [8] P.S.
Radon, Inherent stress biaxiality in various fracture specimen geometries, International Journal of Fracture, V. 19 (1983), p. 311–325

Materials and Methods Materials.
Xu: Polymeric Materials Science & Engineering, Vol.13 (2009) No.4, pp. 125-129.
Chu: Polymeric Materials Science & Engineering, Vol.24 (2008) No.9, pp. 32-35.
Luo: Materials Research and Application, Vol.2 (2008) No.4, pp. 405-408.
Li: Journal of Cellulose Science and Technology, Vol.18 (2010) No.2, pp.33-48.

Nonisothermal Crystallization Kinetics of HDPE/UHMWPE/n-HA Composites Huiling Shena and Na Zhang College of Material Science and Chemical Engineering, Tianjin University of Science & Technology, Tianjin, 300457, P.R.
Experimental Materials.
Hydroxyapatite(HA), MHAP01, was provided by Nanjing Emperor Nano Material Co.
European Polymer Journal Vol. 42 (2006), p. 1994-2003
European Polymer Journal Vol. 39 (2003), p. 1365-1375

Experimental 2.1 Materials Isophorone diisocyanate (IPDI, Aladdin Reagent) is vacuum distilled before using.
Chaudhury, Journal of Colloid and Interface Science. 249(2002), p 235 [2] Z.M.Wang, D.B.
Chen, Journal Application of Polymer Science. 73 (1999), p 2869
Gong: Advanced Materials Research Vols. 79-82 (2009) p 1055 [5] C.

All provinces of China build the freeways in an all-round way concentrating manpower, material resources and finances.
Transportation accessibility The transportation accessibility refers the convenience and portability of communication of materials, energies and staff from a region to another region; reflects the opportunities and potentials of social economy and technical exchange from this region to another region[5].
Nanjing, Journal of Traffic and Transportation Engineering,2003,3(2):57-60 [3] Yang Zhongchen, Lu Yuqi.Preliminary Study of Mutual Influence of Construction of Freeway and Distribution of Regional town.
Xi’an, Journal of Traffic and Transportation Engineering, 2002,2(4): 73-79 [6] Wangwei.
Beijing: Science Press.2001

Concrete is one of the most useful architecture materials in the underground engineering, which capability is related to the useful life and stability of structure.
Science and Technology of Overseas Building Materials, 2008,29（1）：65-68
CHINA RAILWAY SCIENCE, 2009,30(1):74-79
Journal of Shijiazhuang Institute of Railway Technology, 2006,5(2):24-29
Chinese Journal of Geotechnical Engineering, 2000，22(5):545-548.

Journal of Materials Science.
Journal of Materials Science.

Comparison of Coating Properties by Two Pulse Modes on Magnesium Alloy Rongfa Zhang1,2,a, Dayong Shan1,b, Rongshi chen1,c and En-hou Han1,d 1 Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2 Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China a rfzhang-10@163.com, bdyshan@imr.ac.cn, crschen@imr.ac.cn, dehhan@imr.ac.cn Keywords: magnesium alloys, anodic coating, property, electric parameters Abstract.
Guo, et al: Materials Chemistry and Physics Vol. 90 (2005), p. 128 [2] C.
Northwood, et al: Thin Solid Films Vol. 494 (2006), p. 296 [4] Hanhua Wu, Xianyi Lu, Beihong Long, et al: Materials Letters Vol. 59 (2005), p. 370 [5] V.
Yue, et al: Journal of The Electrochemical Society Vol. 151 (2004), p.
Rateick, Jr., et al: Journal of The Electrochemical Society Vol. 151 (2004), p.

Acknowledgements Project (20080441293) supported by China National Postdoctoral Science Foundation.
Journal of Aerospace Power Vol. 21 No.5 (2006), p. 848~853 (in Chinese) [2] Zhitao Mu, Wenlin Liu, Ping Jin.
Key Engineering Materials, Vol 324-325(2006), p.963~966 [3] Zhitao Mu, Wenlin Liu, Xiaohua Yang.
Progress in Safety Science and Technology, Proceedings of Asia Pacific Symposium on Safety 2005.
Journal of Beijing University of Aeronautics and Astronautics, Vol 25, No. 6(2000), p.694~696 (In Chinese) [6] Robert E.

Fig.1 Fractured thoracolumbar FE model Fig.2 Fractured vertebra body and breaking joint (a) (b) (c) Fig.4 Pedicle Screw Fixations for thoracolumbar burst fractures: (a) Monosegmenttal fixation, (b)Short-segment fixation with four screws, (c)Short-segment fixation with five screws Table 1 Material properties used in FEM of the thoracolumbar spine [2,8,9] Materials Young’s Modulus（MPa） Poisson’s ratio Cross sectional area (mm2) Cortical bone 12000 0.3 — Cancellous bone 100 0.2 — Posteriors elements 3500 0.25 — Endplate 24 0.4 — Disc fiber 450 — 0.76 Disc nucleus 1 0.499 — Disc ground substance 4.2 0.45 — Breaking joint 1 0.499 — Pedicle Screw and rod (Titanium alloy) 110000 0.3 — Anterior longitudinal ligament 20 — 63.7 Posterior longitudinal ligament 20 — 20 Transverse ligament 58.7 — 3.6 Ligamentum flavum 19.5
The material properties were defined as the table 1.
Acknowledgment This study is supported by the State Key Fundamental Research Program (No.2011CB711000) and the Science and Technology Support Program of Science and Technology Committee of Shanghai (No. 08411952500).
Chi: Journal of Clinical Neuroscience.Vol.15 (2008), p.286 [6] H.L.
Lee: Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine.Vol.224 ( 2010), p.477.