4 results on '"Liu, Jia-gui"'
Search Results
2. Density gradient tailoring of aluminum foam-filled tube
- Author
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He Si-yuan, Yu Jin, Gong Xiaolu, Zhang Yi, Zhao Wei, Liu Jia-gui, Nanjing Southeast University, Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée (LASMIS), Institut Charles Delaunay (ICD), Université de Technologie de Troyes (UTT)-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Troyes (UTT)-Centre National de la Recherche Scientifique (CNRS), and Nanjing Southeast University (SEU)
- Subjects
Materials science ,Density gradient ,02 engineering and technology ,Metal foam ,Plasticity ,021001 nanoscience & nanotechnology ,Finite element method ,020303 mechanical engineering & transports ,0203 mechanical engineering ,[SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] ,Ceramics and Composites ,Hardening (metallurgy) ,Specific energy ,lipids (amino acids, peptides, and proteins) ,Adhesive ,Composite material ,0210 nano-technology ,Porous medium ,Civil and Structural Engineering - Abstract
International audience; Metallic foam with uniform pore structure has been used as a filling material for the thin-walled tube to improve the structural crashworthiness. Homologous natural porous materials, such as bone, adopt graded pore structures and exhibit excellent performance. Inspired by the biological mechanism of adaptive remodeling in bone, this study proposes a density tailoring method on the foam filler to further improve the energy absorption of the composite structure. This method designs the density gradient of foam filler depending on the internal plastic strain distribution calculated by Finite Element (FE) analysis. The requisite material parameters of aluminum foam for the FE model, including the hardening curves and the plastic Poisson’s ratios, are obtained through experiments. The simulation results demonstrate that the outer part of foam filler exhibits a higher strain level than the inner part when adhesive effect is applied at the foam/tube interface. Radial density gradients are developed for the foam fillers to align with the FEA strain distribution pattern. The graded foam-filled tubes exhibit up to 24% higher specific energy absorptions (SEA) than the equal-weight uniform foam-filled tubes in FE simulations.
- Published
- 2019
3. Fabrication of functionally radial graded metallic foam
- Author
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Zhao Wei, Liu Jia-gui, Gong Xiaolu, Zhang Yi, Zang Xiao-yun, Wang Ke, He Si-yuan, Yu Jin, Nanjing Southeast University, College of Information and Technology Science [Jilin], Jilin Agricultural University (JAU), Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée (LASMIS), Institut Charles Delaunay (ICD), Université de Technologie de Troyes (UTT)-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Troyes (UTT)-Centre National de la Recherche Scientifique (CNRS), and Nanjing Southeast University (SEU)
- Subjects
Fabrication ,Materials science ,Radial gradient ,chemistry.chemical_element ,02 engineering and technology ,Metal foam ,010402 general chemistry ,01 natural sciences ,Metal ,Aluminium ,[SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] ,General Materials Science ,cardiovascular diseases ,Tube (container) ,Composite material ,Mechanical Engineering ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Biological materials ,0104 chemical sciences ,chemistry ,Mechanics of Materials ,visual_art ,visual_art.visual_art_medium ,Specific energy absorption ,lipids (amino acids, peptides, and proteins) ,0210 nano-technology - Abstract
International audience; Radial graded structures in biological materials, e.g. bones, are lightweight and exhibit good mechanical properties. This paper developed a novel method to fabricate a functionally radial graded aluminum foam. In this method, a sequential solidification was applied from the periphery to the inner on the foaming aluminum melt to obtain a radial gradient. The graded foams were then served as fillers for thin-walled tubes. Quasi-static compressive tests were conducted on the foams and foam-filled tubes. The results indicated that the graded foam-filled tubes exhibited improved crushing resistance and specific energy absorption, compared to the uniform foam-filled tube with similar weight.
- Published
- 2019
4. Analysis of Dynamic Properties and Energy Dissipation of Sandstone and Granite.
- Author
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WANG De-rong, LIU Zhao-yan, LIU Jia-gui, and SONG Chun-ming
- Abstract
To compare the dynamic mechanical properties and destruction forms of sandstone and granite with the strain rate ranging from 49 s
-1 to 97 s-1 , impact compression tests were conducted using the spit Hopkinson pressure bar (SHPB) test device with a diameter of 100 mm. The results show that the dynamic compressive strength of the two materials, the extent of damage and energy absorption increased with the increase of strain rate, but the energy dissipation rate of granite gradually decreased with the increase of strain rate, and all of them show strain rate correlation; the initial elastic modulus, peak strain and energy dissipation rate of sandstone under three types strain rates show little difference and a weak strain rate sensitivity. By analyzing the energy absorption and dissipation rate curves in the loading process, the dynamic failure modes were analyzed from the perspective of microstructure. Through the verification of the test validity, it is proved that the test meets the assumption of uniformity better. [ABSTRACT FROM AUTHOR]- Published
- 2017
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