Search results

Experimental methods The original material used in this work was a hot-rolled steel bars, the chemical composition of the experimental steel bars was analyzed by inductively coupled plasma optical emission spectrometer (ICP) and the weight percentages were 0.32% C, 0.84% Si, 1.19% Mn, 0.012% P, 0.012% S and the balance Fe.
The macro fracture morphology of specimen 1# shows cup cone which reflect the material has good plasticity.
Acknowledgments This work is supported by Key projects in the National Science&Technology Pillar Program during the Eleventh Five-year Plan Period under grant code# 2008BAE61B01.
Wire Journal International, 1992. (8): 49

For instance, sampling inspect the quality of construction material in sites, detect steel’s quality whether meeting the requirement of construction and check the technology of erecting formwork whether the correct.
Fig. 1 The curvilinear relation between construction safety cost and accident rate Conclusion Safety management is a major event mattering material-property safety of our nation and people.
Wang, Discussion on safety management of construction site, Journal of Safety Science and Technology, 8 (2012) 222-225

Acknowledgments This research is sponsored by the National Natural Science Foundation, China (No. 51175527; No. 50835008); and the National Major Scientific and Technological Special Project for “High-grade CNC and Basic Manufacturing Equipment”, China (No. 2011ZX04003-031; No. 2012ZX04011-031; No. 201341012014).
Reliability analysis of machine tool structure．Journal of Engineering for Industry 1977; 99(4): 882-888
Key Engineering Materials 2006; 321-323(II): 1535-1538．

Through the optimization of the structure, not only make the statics performance parts can be improved, but also make the anti vibration characteristics of the structure is improved, saving material, to obtain the optimum size of structure.
Therefore, this thesis mainly studies the content is in the premise of ensuring safe and reliable structure the structure more reasonable by using the finite element analysis method and optimization technique; in ensuring the structure have enough strength, stiffness and stability conditions, saving the material consumption, reduce the product cost; finite element analysis model is established for a generally applicable to the box structure.
Put forward higher requirements for the development of science and technology of a machine tool.
Zhang, The FEM mechanical structure optimization design based on static, dynamic performance, Journal of Southwest Jiao Tong University, 38 (2003) 517-520

Table 3 The PE of backwater height of different mean median grain Natural void radio >1.2 1.2～0.6 0.6～0.3 0.3～0.2 PE(%) 50.4 8.8 40.0 error It is difficult to determine the mean median grain when the riverbed material composition is complex, so it is empirical and arbitrary to determine the mean median grain.
Conclusions The backwater height of the bridge is affected by many factors, such as river flow regime, boundary conditions, riverbed material composition, water blocking ratio of the bridge, and the shape of the bridge pier, etc.
Backwater Characteristics of Speedway Skew Bridges, Hydro-Science And Engineering, Vol. 3 pp.41~46, 2007
An Iterative Method of Backwater Height Calculation for Vegetation Domain, Journal of Hydrodynamics, Vol. 20 pp.79~83, 2005

Acknowledgement The National Nature Science Fund Projects(61172013) References [1] Bonnecaze RT, Brady JF (1992) Dynamics simulation of an electrorheological fluid.
B., Fabrication of off-axis aspherical mirrors with loose abrasive point-contact machining, Key Engineering Materials, 2004, 257—258: 153—158
[8] Hou Baolin,MEHDI Ahmadian.Modeling and Analysis of a Magneto-Rheological Shock damper.Chniese Journal of Mechanical Engineering,Vol.42(4)

This material has a Young's modulus value of E = 3600 MPa, which significantly increases the size of deformation and thus the sensitivity of the measurement.
In order to extend the deformation values and not to exceed the supported displacement of strain gauges a polyacetal material has been used to create these flexible elements.
Żak “Tests on Cardiosurgical Robot RobIn Heart 3” Lecture Notes in Control and Information Sciences, Springer Verlag, Volume 396/2009
The International Journal of Artificial Organs.

Spindle Thermal Analysis of CNC Milling Machine Xuejun Nie1,2 1School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China 2College of Material and Mechanical Engineering, Beijing Technology and Business University, Beijing, 100048，PR China niexj@th.btbu.edu.cn Keywords: CNC milling machine; spindle; thermal analysis; thermal deformation Abstract.
In ANSYS the spindle model is imported, and material parameters of spindle and bearings are set up.
Beijing: Science Press, 2006
Journal of aerospace power, 1999,14 (3): 309-312

Introduction Composite materials are widely applied to spacecraft parts due to their high stiffness-to-weight ratio, high strength-to-weight ratio, and low thermal expansion coefficient.
Le Riche and R.T Haftka: AIAA Journal, 31(5) (1993), p. 951
Korean Society for Aeronautical and Space Science 27(2) (1999), p. 111.

Materials and methods 1.1 Description of the study area The study area is located at the estuary of the Yellow River in the northeastern part of Shandong Province, China.
Journal of Geographical Sciences, 14(1), p.29-37, (2004)