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Introduction With the development of the science and technology, the number of the micro hole is more and more; the materials are more and more difficult; and the quality requirement is higher and higher, the micro hole machining is more and more difficult [1].
In national defense industry, especially aero engine industry, it is failed to solve the micro-hole machining of difficult materials such as high-temperature, stainless steel and Ti alloy.
(3) Compared with EDM machining, the micro hole vibration drilling for difficult-to-machine materials can improve the machining quality, including hole shape precision, dimension accuracy.
Wang: Journal of Agricultural Machinery Vol.36, (2005), p. 11 [2] H.L.
Shen: Mechanical Engineering Journal Vol.45, (2009), p. 1 [5] H.L.

The theory takes the effect of into consideration and uses a unified mechanical model to describe the features of different materials.
Reinforcing steel supporting capacity The reinforcing steel wraps in the concretes is at three to the compression stress condition, may know according to the materials mechanics:
Regarding the majority metal materials, has the obvious yield point, and the tensile strength and the compressive strength are equal, therefore the material pulls presses the ratio to take 1.
Science Press.
Science Press.

Materials and Methods Materials Fir veneer was made from the fast-growing Chinese fir taken from Lin’an Voyage Wood Industry Co., Ltd.
Acknowledgments The authors are grateful for the support of the Project of Science and Technology Department of Zhejiang Province (No. 2008C32023) and the Project of Forestry Department of Zhejiang Province (No. 2012SY01), Foundation of Major Discipline of Wood Science & Technology of Zhejiang Province Key Disciplines (No. 201009).
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Badzian: Diamond and Related Materials Vol. 6 (1997), p. 130

The analysis so far means that modest offsetting compromises in the manufacturing process can achieve sufficiently high efficiency by employing the standard tolerances used in high volume manufacturing and cheaper mirror materials. 2.
and Ahmed, N.A., ‘Theoretical calibration of a five hole probe for highly three dimensional flow’, Meas Science and Technology, Vol. 13, No. 7, 2002, pp1100-1107
[21]Ahmed, N.A., Elder, R.L., Foster, C.P. and Jones, J.D.C., ‘Miniature Laser Anemometer for 3D Measurements’, Measurement Science and Technology, Vol. 1, No. 3, 1990, pp. 272-276
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[31]Shun, S., and Ahmed, .A., ‘Design of a Dynamic Stall Test Rig’,Applied Mechanics and Materials Vols. 215-216 (2012) pp 785-795, © (2012) Trans Tech Publications, Switzerland [32]Shun, S., and Ahmed, N.A., ‘Rapid Prototyping of Aerodynamics ResearchModels’, Applied Mechanics and Materials Vols. 217-219 (2012) pp 2016-2025, © (2012) Trans Tech Pub, Switzerland [33]Lien, S.J., and Ahmed, N.A., ‘A novel method for Skin friction determination using multi-hole pressure probes’, 12th Australian Int Aerospace Congress/12thAustralian Aeronautical Conference19-22, March 2007, Melbourne, Australia [34]Yen, J., and Ahmed, N., ‘Improving Safety and Performance of Small-Scale Vertical Axis Wind Turbines’, Procedia Engineering, Vol. 49, 2012, pp. 99-106

The FLC minima of all materials are slightly shifted toward positive φ2 values.
Engel, “Flexible manufacturing chain with integrated incremental bending and Q-P heat treatment for on-demand production of AHSS safety parts,” Journal of Materials Processing Technology, vol. 275, p. 116312, Jan. 2020, doi: 10.1016/j.jmatprotec.2019.116312
Kuczyński, “Limit strains in the processes of stretch-forming sheet metal,” International Journal of Mechanical Sciences, vol. 9, no. 9, pp. 609–620, Sep. 1967, doi: 10.1016/0020-7403(67)90066-5
Khodayari, “Bending Limit Curve for Rotary Draw Bending of Tubular Components in Automotive Hydroforming Applications,” SAE International Journal of Materials and Manufacturing, vol. 1, no. 1, pp. 841–848, 2009
Merklein, “Analysis of the bending effects and the biaxial pre-straining in sheet metal stretch forming processes for the determination of the forming limits,” International Journal of Mechanical Sciences, vol. 138–139, pp. 295–309, Apr. 2018, doi: 10.1016/j.ijmecsci.2018.02.024.

Investigation of Bio-mimetic synthesis SH/KGM/HAP Scaffold Chongyan LENG1,a, Yongshun CUI, Yin LI, Xiaopei Wu , Qinghua Chen 1,b 1Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming, 650093,China a lengchongyan22@yahoo.com.cn, chenqinghua_yn1@163.com Keywords: Sodium Hyaluronate, Konjac glucomannan, Hydroxyl-apatite, Bio-mimetic synthesis Abstract: Sodium hyaluronate / konjac glucomannan (SH/KGM) porous scaffolds were prepared via blending sodium hyaluronate and konjac glucomannan.
X-ray diffraction and fourier transform infrared spectroscopy (FTIR) were used to characterize the crystallization and chemical structure of SH/KGM and SH/KGM/HAP scaffold materials.
It indicates that SH/KGM porous scaffold materials induce HAP crystal depositing, the spherical particles have the size between 1 ~ 5 μ m, and they piled up tightly one by one in the SH/KGM/HAP scaffold sample. 2.3 Chemical structures of the SH/KGM and SH/KGM/HAP scaffold samples Fig.3 FTIR spectra of the SH/KGM and SH/KGM/HAP scaffold samples The FTIR spectra of the SH/KGM and SH/KGM/HAP scaffold samples are presented in Fig.3.
Acknowledgements This work is supported by the Basic Application Research of Yunnan Province in key Projects (2009CC020), Foreign Science and Technology Cooperation Programs of International Cooperation (2011IA008) and Basic Application Research of Yunnan Province (KKSA201151053).
:Science & Technology Review [J], 2008, 26(22): p. 47-49 [7] L.Hong, H.Weiya , Z Yuanming, et al.. : Materials Science and Engineering C,2007, 27: p.756–761 [8] X.Y.Lin, Q.Wu, X.G.Luo, et al.. : Carbohydrate Polymers , 2010,82: p.167–172 [9] D.Jian, D.Jing, J.L.Liu , et al.. : Reactive & Functional Polymers, 2006,66: p.1055–1061 [10] A.Felipe, L.Mariana , L.Igor : International Journal of Pharmaceutics, 2008,349: p. 11–18

Introduction Damage mechanics constitutive models are widely used for engineering materials and have received a great deal of research efforts in the past decades.
Lele, “Gradient single-crystal plasticity with free energy dependent on dislocation densities“, Journal of the Mechanics and Physics of Solids, vol. 55, 2007, p.1853–1878. ].
Li, “Microelement formulation of free energy for quasi-brittle materials”, Journal of Engineering Mechanics-ASCE, vol. 140, 2014, no.06014008. ], which may take the form of Peach–Koehler forces on dislocation lines in crystals or static friction on microcracks in quasi-brittle solids.
As of now very little is quantitatively known about the storage and release of plastic free energy in various kinds of materials, which need future investigation for physical understanding of damage.
Acknowledgements Financial supports from the National Natural Science Foundation of China (Grant Nos. 51108336, 51378377) are greatly appreciated.

Experimental Measurement Used materials.
This was achieved for all materials.
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[11] Osuji S O and Ukeme U 2015 Nigerian Journal of Technology 34 472-477

Acknowledgements The authors would like to acknowledge the support by National Natural Science Foundation of China (No. 50575183) and China Postdoctoral Science Foundation (No. 20080441191).
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