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Arc heat source model of GTAW under the magnetic field was established, also consider physical properties of materials varying with the temperature and the influence transformation, through the method of killing or activating elements treatment such as melting or solidification by welding pool, 3D FEM simulation analysis for the temperature gradient and residual stress size distribution to GTAW welded joints compared to on magnetic field or not.
Indirect approach to calculation of residual stress, first perform non-linear transient thermal analysis, transient thermal analysis will be added to the temperature as the body structure of the load stress field solution. 2.1 Geometric solid modeling and finite element mesh Q235 steel specimen material (size 100mm×70mm×2mm), the temperature-dependent of material properties in Table 1 [4], using the GTAW without filler metal plate butt welding, welding specifications in Table 2.
Acknowledgements This research was supported by the Natural Science Foundation of Jiangxi Province under Grant No.CA201003023.
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Printing materials include specialty concrete, cement mortar, geopolymers, unburnt clay and various types of plastics.
The basic components of the material are cement and sand.
At the university campus of the Huazhon University of Science and Technology, Wuhan, China, a replacement of the damaged stone pedestal of the historic column was carried out as part of the 3D print research.
Hamzeh, 3D concrete printing: Machine and mix design, International Journal of Civil Engineering and Technology 6 (2015) 14–22
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Acknowledgement This study was supported by the the Ningxia Science technology Support Plan Projects (No.2013Zys149), the Indigenous Programs from Ningxia Academy of Agricultural and Forestry Sciences (No.nkyg-13-11) and Chinese Postdoctoral Science Foundation (No.2014M550374).
Environmental Science, accepted.
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According to the mechanics of materials, suppose the angle between the x-axis direction and the neutral axis of the section is α, as shown in Fig.1, the geometrical moment of inertia with respect to the neutral axis of the section is obtained: )sin cos( 12 22 22 α α α b h bh I + =
Acknowledgments This research project was supported by the Ministry of Construction of China in the Project of Research & Development through Grant No. 06-K1-34, by the Guangdong Province of China at Natural Science Foundation Grant No. 07010874 and by Wuyi University Science Foundation Grant.
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Using this method, only light radiated into the test window can be collected because any other light slopes out as the material around the test window is smooth.
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Materials and methods 2.1 Soil A loamy sand soil that had not been previously treated with atrazine and nicosulfuron or other pesticides in laboratory experiments was collected from the top layer (0–20 cm) of grass-covered field that was located within the Shenyang area, Liaoning province.
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Materials and Methods Fuzzy set theory generalizes classical set theory in that the membership degree of an object to a set is not restricted to the integers 0 and 1, but may take on any value in [0, 1].
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