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Calculation on Fracture Parameter of Model I Crack Tip Based on ANSYS Ke Songa, Bangcheng Yangb Dept of Engineering Mechanics, Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China asongkesk@sina.com, byangbc5@163.com Keywords: interaction integral method, VCCT, fracture parameter, crack, ANSYS.
The fracture parameter can only be applied in the elastic material.
When crack produce enough energy to overcome the material resistance stress, it will have the crack propagation.
But altering the material parameters of the crack model will not change stress intensity factor and the energy release rate.
Vol. 27 (2006) p.54 [4] Jinxia Yue, Heng Zhou: Journal of Wuhan University of Technology.

Material Parameters.
The soil and pile material properties are shown in Table 3.
Acknowledgements The financial aid from National Science Foundation in Taiwan in contract No.
Journal of Geotechnical Engineering, Vol. 117 (1991), p. 448-466
Potyondy: Skin friction between various soils and construction materials, Geotechnique, Vol. 11 (1961), p. 339-353

Materials Science & Engineering A (2008), doi:10.1016/j.msea.2009.04.056
Materials Science and Engineering A.
Materials Science and Engineering A.
Materials Development and Application .Vol. 14 (1) (1999), p. 39 (In Chinese)
Welding Journal.

Experimental Materials and Methods Experimental Materials and Equipment.
The upper materials are ecru HDPE (40mm×80mm×3mm) and LDPE (40mm×80mm×3mm).
Liu et al: Polymer Materials Science and Engineering.
Zak, et al: Journal of Heat Transfer,Vol. 129 (2007) No. 9,pp. 1177～1186
Chen, et al: Journal of Materials Processing Technology, Vol. 210 (2010), No. 1, pp. 24～31

Acknowledgements This paper is funded by Center for Environmental and Resources Law of Jiangxi University of Science and Technology which is a Jiangxi Province Key Institute of Humanities and Social Sciences.
Advances in Psychological Science. 2013, 4:751-760
Journal of Psychological Science.2010,6:1448-1450
Manager Journal.2012,10:8-9
Journal of Environmental Psychology. 2009,29:309–317.

Experimental Materials.
All these materials were used as received without further purification.
Uniformly dispersing of carbon nanotubes in the polymer matrix will improve the mechanical properties of the composited material, and non-uniform dispersion make materials to form a multiphase system, the structure of the composite material will be destroyed.
More than this concentration, the properties of the materials would decline [7].
Colloid and Polymer Science, 2004, 282: 972-978 [4]Yi He, Xiaobo Liu, Daowen Luo, Wenjing Chen, Biodegradable Polyetheresteramides Synthesized from e-Caprolactone, 6-Aminocaproic Acid, and Poly (ethylene glycol), Journal of Applied Polymer Science, Vol. 108(2008), 1689–1695 [5] Ajayan PM.

Research on the Purifying Performance of Filters to Inhalable Particles Wei Zhang 1, a, Yubin Zhang 2,b 1 College of Textile and Garment, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, China 2 Research Center of Engineering and Technology of Textile and Garment, Hebei Province, Shijiazhuang, Hebei, 050031, China azhwei69@126.com, b yb_zhang1970@126.com Keywords: inhalable particle,filter,experimental device,purifying performance Abstract.
With the device,6 filters were taken as research objectives with a view to investigating the purifying performance to particles in ambient air,the influencing factors such as raw materials and structures on filters’ purifying performance were pointed out.
DP1000-Ⅱ digital micro manometer 5.rotameter flowmeter 6.oil-free vacuum pump Experimental materials 6 filters with similar diameter of fiber and areal density were taken as research objectives with a view to investigate the purifying performance to particles in ambient air, their specification and structure parameters are shown in Table1.
Filtration performance of PP acupuncture electret filters With the increase of velocity, filtration efficiency decrease; the higher velocity is, the greater resistance is.With the increase of weight, the filtration efficiency and resistance of electret filter material increase, but the resistance increases with the weight to a lesser extent.Dust capacity of PP acupuncture electret filter materials are as shown in Table 2.
W.Zhang: Journal of HV&AC. 34(2005) p.12 (In Chinese) [4] X.Yu.

Modelling Yield Strength in an A6061 Aluminium Alloy Johannes Kreyca1*, Ahmad Falahati2 and Ernst Kozeschnik1 1Institute of Materials Science and Technology, Vienna University of Technology Getreidemarkt 9, 1060 Vienna, Austria 2MatCalc Engineering GmbH, Getreidemarkt 9, 1060 Vienna, Austria Keywords: yield stress, A6061, precipitation, dislocation, hardening.
The experimental work presented here is performed on a Gleeble 1500 thermo-mechanical simulator, where the solution annealed and quenched samples are heat treated to produce materials in various microstructural conditions.
Together with precipitation hardening, the individual contributions are summed up to form the mechanical threshold of the material (i.e. the theoretical yield stress for a given microstructure at 0K), with , (1) where stand for the contributions from grain-boundary hardening, solid solution strengthening, precipitation hardening, dislocation hardening and the basic yield strength of the pure material.
Mecking, Physics and phenomenology of strain hardening: the FCC case., Progress in Materials Science, Vol.: 48, pp. 171-273, 2003. [5] S.
Journal of Fatique , Vol.: 33, pp. 1369-1375, 2011. [6] R.

Tool shoulder has friction with the top surface of the plates and compresses the friction stirred materials.
Thermal and plastic behaviors of materials can be characterized using constitutive equations mathematically.
Dawson: Materials Science and Engineering (A), Vol. 398(2005), p. 146 [5] J.
Dawson: Modeling and Simulation in Materials Science and Engineering, printing (2007) [7] Y.S.
Hart: Journal of engineering materials and technology Vol. 98(1976), p.193 [9] U.

The results showed that in the surrounding area of defects Mises stress, compressive strain and pore pressure are affected by the amount of compression and modulus of materials.
Introduction Articular cartilage (AC) is a kind of superior load-bearing materials, which play an key biomechanical role by reducing impact load, providing frictionless articulation ,as well as distributing applied loads over joint area.
When biphasic materials is subjected to loading ,the liquid pressure will increase instantaneously and carry most of the total stress, so it can decrease the force on solid matrix phase stress, and reduce surface friction.
Fig. 7 Pore pressure in different compression Fig. 8 Pore pressure in different modulus  Discussion and Conclusions Under slide loading conditions, different compressions and modulus of artificial cartilage material have impacts on the mechanical state at the defects.
Acknowledgements The project was partly supported by the National Natural Science Foundation of China (Nos. 31000422, 11172208, 81272046).