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Conclusions The initial defect of drill string was simplified as circumferential semi-elliptical surface crack, and 30CrMo were chosen as material whose constitutional relation was fitted by experiment as Ramberg-Osgood equation.
Acknowledgments This work is supported by National Natural Science Foundation of China (11102173, 51134004) and Key Laboratory of Oil and Gas Equipment from Ministry of Education.
Zhang et al, Comparative study on dynamics behaviors of the full drillstring between gas drilling and mud drilling, Journal of Southwest Petroleum University (Science & Technology Edition). 33 (2011) 139-143
Saxena, J-integral expressions for semi-elliptical cracks in round bars, International Journal of Fatigue. 29 (2007) 822–828
Handbook of the stress intensity factor (Revised edition), Science Press, Beijing,1993.

The flood and ebb current in this area are relatively strong, and the bed material is mainly composed by fine sand and clay.
Acknowledgement This work was financially supported by Science Fund of National Research Institutes of China which provided financial support, under contract TKS120203, TKS120103.
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The research on optimization of electrostatic field for high voltage electrostatic spinning machine Changjie Liu1,a, Jing Zhang 2,b and Ye Dai3,c 1Physics research section, Aviation University of Airforce , Changchun 130022, China 2Computer research section, Aviation University of Airforce , Changchun 130022, China 3School of Mechanical & Power Engineering, Harbin University of Science and Technology, Harbin 150080, China aliuchangjie@163.com, bjing_0714@tom.com, cdaiye312@163.com Key words: electrostatic spinning technology; optimization; electric field analysis.
When solvent has be solidificated, Fibrous material is get.
Journal of Materials . 2009

Ricottilli, Innovation and Growth through Local and Global Interaction, In: Journal of Economic Dynamics & Control, Vol. 33 (2009) 1779-1795
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Materials and Methods Reagents and Instruments.
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Transient voltage waveforms used to assess arc stability during GTAW of samples of (a) RHP, (b) press-and-sinter and (c) wrought Ti-6Al-4V materials.
Typical weld zone microstructures for the three materials under investigation are shown in Figure 3.
The data presented below shows that the hardness levels in the HAZ of PS samples differ significantly from that of both RHP and wrought materials.
Schaffer, Sintering of titanium powder compacts for containerless hot isostatic pressing, Materials Science Forum, 618-619 (2009) 509-509-512
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Nickel (II) oxide is a promising electrochromic material as alternative to other electrochromic materials such as iridium oxide and ruthenium oxide due to its good optical property and inexpensive material [10].
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However in the end the main databases in the end were Springer Journals, Elsevier and EBSCO.
There are, according to Rao et al. [4], three different dividing groups for sheet metal part features: management features, shape features and material features.
Of course each of these groups is including more information about the part; material, drawing number et cetera.
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Xiao: Automatically extracting sheet-metal features from solid model, Journal of Zheijiang University SCIENCE, Vol. 5 (2004), pp. 1456-1465 [9] M.

When the vehicle door’s crashworthiness is studied, people usually blindly increase the support structure or change the material in order to enhance the door’s crashworthiness, which will not only increase the weight of vehicle door, but also waste the material [1].
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Wu: Journal of Mechanical Engineering, Vol. 47 (2011) No.2, pp.102-108. ( In Chinese)