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Your search keyword '"Zhang, Gaolong"' showing total 26 results
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26 results on '"Zhang, Gaolong"'

3. Extraction of features for surface topography by morphological component analysis

Author

Ying Liu, Yuming Wang, Zhang Gaolong, Xiangfeng Liu, Wang Yuechang, and Fei Guo

Subjects
Surface (mathematics), 0209 industrial biotechnology, Materials science, Mechanical Engineering, Functional features, 020208 electrical & electronic engineering, Extraction (chemistry), 02 engineering and technology, Surfaces and Interfaces, Tribology, Surfaces, Coatings and Films, 020901 industrial engineering & automation, Mechanics of Materials, 0202 electrical engineering, electronic engineering, information engineering, Lubrication, Cemented carbide, Graphite, Composite material, Morphological component analysis
Abstract

Surface topography is one of the important factors that influence tribological performance, for instance friction, lubrication, and wear. Moreover the functional features of the surface topography, such as peaks/pits and scratches, play an especially important role in the analysis and simulation of these tribological properties. In this study, a method was developed to simultaneously extract the peaks/pits and scratches as two separate surfaces from one measured surface topography scan. This technique was based on the morphological component analysis. A honed stainless steel surface, a lapped cemented carbide surface, and a lapped graphite surface were measured to verify the proposed method. The results showed that the peaks/pits and scratches could be separated and extracted from the measured surfaces.

Published
2018

4. Wear behavior of WC-Ni sliding against graphite under water lubrication

Author

Yuming Wang, Fei Guo, Zhang Gaolong, Ying Liu, Wang Yuechang, and Xiangfeng Liu

Subjects
Shearing (physics), Materials science, Polymers and Plastics, Scanning electron microscope, Mechanical Engineering, Abrasive, Metallurgy, Metals and Alloys, 02 engineering and technology, 021001 nanoscience & nanotechnology, 020303 mechanical engineering & transports, 0203 mechanical engineering, X-ray photoelectron spectroscopy, Mechanics of Materials, Materials Chemistry, Ceramics and Composites, Cemented carbide, Lubrication, Graphite, 0210 nano-technology
Abstract

Wear of hard materials in contact with softer materials is a neglected area of research. However, we observed considerable wear phenomenon at a hard WC-Ni surface sliding over soft graphite under water lubrication. The influences of applied load and the application history on the wear of surface were addressed in our experimental design. Wear of both graphite and WC-Ni surfaces increased with a greater applied load and repeated sliding. The topographies of the worn surfaces showed clear micro-scratches on the hard WC-Ni surface. Scanning electron microscopy and X-ray photoelectron spectroscopy analyses revealed that the abrasive wear of the WC-Ni surface could be attributed to hard WC particles embedded in the graphite surface. These hard particles were formed by shearing of sharp WC-Ni asperities under certain conditions and intrinsic defects of the WC-Ni surface could accelerate this wear process.

Published
2017

6. Friction Characteristics of Impregnated and Non-Impregnated Graphite against Cemented Carbide under Water Lubrication

Author

Ying Liu, Zhang Gaolong, Fei Guo, Xiangfeng Liu, and Yuming Wang

Subjects
Materials science, Polymers and Plastics, Scanning electron microscope, Mechanical Engineering, Metals and Alloys, 02 engineering and technology, 021001 nanoscience & nanotechnology, symbols.namesake, 020303 mechanical engineering & transports, 0203 mechanical engineering, Mechanics of Materials, High pressure, Materials Chemistry, Ceramics and Composites, Lubrication, Cemented carbide, symbols, Graphite, Wetting, Composite material, 0210 nano-technology, Raman spectroscopy
Abstract

The friction behavior of resin-impregnated and non-impregnated graphite sliding against a cemented carbide in dry, oil, and water environments using a ring–ring configuration was investigated. Friction coefficients were recorded at various speeds. The results showed that the impregnated graphite exhibited much better friction properties under water or oil lubrication than non-impregnated graphite, and the impregnated graphite could remain in the stable friction regime under high pressure × velocity ( pv ). Based on scanning electron microscopy and Raman spectroscopy analyses, the different characteristics between impregnated and non-impregnated graphite were able to be attributed to the structure of the graphite and wettability of the lubricants.

Published
2017

7. Strengthening against {101¯2} twinning by discontinuous and continuous precipitate in a strongly textured Mg-9Al alloy

Author

Xiuzhu Han, Zhang Gaolong, Chuming Liu, Yingchun Wan, Jiansheng Wei, and Jianbo Shao

Subjects
010302 applied physics, Materials science, Mechanical Engineering, Alloy, Nucleation, 02 engineering and technology, Slip (materials science), engineering.material, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Shear (geology), Mechanics of Materials, 0103 physical sciences, engineering, General Materials Science, Extrusion, Composite material, 0210 nano-technology, Crystal twinning
Abstract

Precipitate strengthening against {10 1 ¯ 2} twinning was examined and compared with basal and prismatic slip in a strongly textured Mg 9Al extrusion plate. The plate was aged for various periods of time and mechanically tested in three orientations. The estimated critical resolved shear stresses (CRSS) for {10 1 ¯ 2} twinning was increased by 54 MPa, significantly larger than the 18 MPa for basal and the 21 MPa for prismatic slip. Of the two types of precipitate responsible for the larger increment of CRSS for twinning, the discontinuous precipitate was suggested to have a stronger suppressing effect on the twin nucleation and propagation than the continuous precipitate.

Published
2020

24. In utero exposure to diisononyl phthalate caused testicular dysgenesis of rat fetal testis

Author

Li, Linxi, primary, Bu, Tiao, additional, Su, Huina, additional, Chen, Zhichuan, additional, Liang, Yuyuan, additional, Zhang, Gaolong, additional, Zhu, Danyan, additional, Shan, Yuanyuan, additional, Xu, Renai, additional, Hu, Yuanyuan, additional, Li, Junwei, additional, Hu, Guoxin, additional, Lian, Qingquan, additional, and Ge, Ren-Shan, additional

Published
2015
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