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学者姓名：龙连春
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Abstract ：
The yield surfaces and the evolution of yield surfaces of a bending-dominated pyramidal lattice material under complex stress states considering the coupling effect of axial force and bending moment of a strut are studied theoretically. The two-dimensional primary yield surfaces, secondary yield surfaces, and complete yield surfaces of pyramidal lattice materials of two kinds of cross-section struts are obtained, and the analytical expressions of yield surfaces are established. The effects of the inclination angle and diameter-to-length ratio of the struts on the yield surfaces of pyramidal lattice materials with circular cross-sections are discussed. The results provide a basis for analyzing homogenized plastic properties of complex lattice material structures.
Keyword ：
analytical solutions analytical solutions plastic yield surfaces plastic yield surfaces Lattice materials Lattice materials
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| GB/T 7714 | Liu, Hui , Long, Lianchun . Study on plastic yield surfaces of pyramidal lattice materials with circular and rectangular cross-sections [J]. | MATHEMATICS AND MECHANICS OF SOLIDS , 2024 , 30 (5) : 1109-1123 . |
| MLA | Liu, Hui 等. "Study on plastic yield surfaces of pyramidal lattice materials with circular and rectangular cross-sections" . | MATHEMATICS AND MECHANICS OF SOLIDS 30 . 5 (2024) : 1109-1123 . |
| APA | Liu, Hui , Long, Lianchun . Study on plastic yield surfaces of pyramidal lattice materials with circular and rectangular cross-sections . | MATHEMATICS AND MECHANICS OF SOLIDS , 2024 , 30 (5) , 1109-1123 . |
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Abstract ：
Unlike conventional homogeneous nanograined (NG) materials, gradient structured materials combine high strength and ductility. The gradient nanograined (GNG) structures are divided into three zones by grain size: the small-grained zone, the transition-grained zone, and the large-grained zone. Molecular dynamics (MD) simulation is performed to investigate the effect of the widths of zones on the strength of GNG structures with different grain sizes. The simulation results reveal the strengthening mechanism of GNG structures from the perspective of microstructure evolution. With the change in grain size, the dominant deformation mode changes from grain boundary (GB) activities in the mall-grained zone to dislocation slip in the large one. The inverse Hall-Petch phenomenon is observed during plastic deformation. Synergistic strengthening of dislocation and heterodeformation induced (HDI) can be achieved in the structure by regulating the widths of zones with different grain sizes.
Keyword ：
grain sizes grain sizes molecular dynamics simulations molecular dynamics simulations grain boundary activities grain boundary activities gradient nanograined structures gradient nanograined structures heterodeformation-induced strengthening heterodeformation-induced strengthening
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| GB/T 7714 | Qiang, Wanzhi , Wu, Qi , Long, Lianchun . Synergistic Strengthening of Dislocation and Heterodeformation Induced in Gradient Nanograined Copper Film: A Molecular Dynamics Study [J]. | PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE , 2023 , 220 (6) . |
| MLA | Qiang, Wanzhi 等. "Synergistic Strengthening of Dislocation and Heterodeformation Induced in Gradient Nanograined Copper Film: A Molecular Dynamics Study" . | PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE 220 . 6 (2023) . |
| APA | Qiang, Wanzhi , Wu, Qi , Long, Lianchun . Synergistic Strengthening of Dislocation and Heterodeformation Induced in Gradient Nanograined Copper Film: A Molecular Dynamics Study . | PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE , 2023 , 220 (6) . |
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Abstract ：
Defects are an inevitable occurrence during the manufacturing and use of ferromagnetic materials, making it crucial to study the microscopic mechanism of magnetostrictive properties of ferromagnetic materials with defects. This paper conducts molecular dynamics simulations on low-dimensional iron thin films containing hole or crack defects, analyzes and compares the impact of defect size on magnetostrictive properties, and investigates the microscopic mechanism of their effects. The results indicate that the saturation magnetostrictive strains of the defect models do not increase monotonically as the defect size increases. Additionally, it is discovered that the arrangement of atomic magnetic moments in the initial magnetic moment configuration also affects the magnetostrictive properties. When controlling the size of the hole or crack within a certain defect area, it is found that the hole size has less influence on the initial magnetic moment configuration, resulting in a smaller corresponding change in the saturation strain and thus having a lesser impact on the magnetostrictive properties. Conversely, when the crack size changes, the arrangement of the atomic magnetic moments in the initial magnetic moment configuration changes more significantly, resulting in a greater corresponding change in saturation strain, and thus having a greater impact on the magnetostriction performance.
Keyword ：
low dimension low dimension magnetostriction magnetostriction iron thin film iron thin film defect size defect size molecular dynamics molecular dynamics
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| GB/T 7714 | Yang, Hongwei , Ma, Panpan , Zhang, Meng et al. Molecular Dynamics Simulation of the Effect of Defect Size on Magnetostrictive Properties of Low-Dimensional Iron Thin Films [J]. | NANOMATERIALS , 2023 , 13 (23) . |
| MLA | Yang, Hongwei et al. "Molecular Dynamics Simulation of the Effect of Defect Size on Magnetostrictive Properties of Low-Dimensional Iron Thin Films" . | NANOMATERIALS 13 . 23 (2023) . |
| APA | Yang, Hongwei , Ma, Panpan , Zhang, Meng , Long, Lianchun , Yang, Qianqian . Molecular Dynamics Simulation of the Effect of Defect Size on Magnetostrictive Properties of Low-Dimensional Iron Thin Films . | NANOMATERIALS , 2023 , 13 (23) . |
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Abstract ：
The weak magneto-optical (MO) signal of traditional MO materials is indeed an important issue for their further practical applications. Although many strategies have been proposed to improve the MO effect, hybridization with noble metal nanostructures is a promising route in recent years due to the high localized-surface plasmon resonances (LSPR) effect. A new magneto-optical surface plasmon resonance (MOSPR) structure hybrid with Au bowtie arrays is proposed to increase the measuring range of the polar magneto-optical Kerr effect (PMOKE) and the quality factor through the LSPR effect. It is verified by a numerical simulation of the finite element method (FEM). The optimized parameters were found by modulating the shape and geometric dimensions. Owing to the significant LSPR from the Au bowties, a PMOKE amplification signal spectrum with narrow linewidth, and a high amplitude with high-sensing performance was achieved. Compared with the bare magnetic film alone, by optimizing the relevant parameters of the LSPR structure, the maximum signal increases 3255 times, and the quality factor can be greatly improved, which would provide important guidance and help for the practical application of MO devices.
Keyword ：
quality factor quality factor magneto-optical surface plasmon resonance magneto-optical surface plasmon resonance polar magneto-optical Kerr effect polar magneto-optical Kerr effect numerical simulation numerical simulation
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| GB/T 7714 | Liu, Jingyi , Long, Lianchun , Yang, Yang . Modeling of Enhanced Polar Magneto-Optic Kerr Effect by Surface Plasmons in Au Bowtie Arrays [J]. | NANOMATERIALS , 2023 , 13 (2) . |
| MLA | Liu, Jingyi et al. "Modeling of Enhanced Polar Magneto-Optic Kerr Effect by Surface Plasmons in Au Bowtie Arrays" . | NANOMATERIALS 13 . 2 (2023) . |
| APA | Liu, Jingyi , Long, Lianchun , Yang, Yang . Modeling of Enhanced Polar Magneto-Optic Kerr Effect by Surface Plasmons in Au Bowtie Arrays . | NANOMATERIALS , 2023 , 13 (2) . |
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Abstract ：
Three-dimensional lattice structures with high specific strength, specific stiffness and low apparent density, are widely employed across multiple engineering fields. Under uniaxial compressive loading, the lattice structure may experience local buckling or global buckling. This paper conducted a systematic parametric study of the various factors affecting the buckling behavior of multilayer pyramid lattice structures to investigate the mechanism of the two main instability modes, local and global buckling. It was found that the critical buckling load increases with the increase in the size of the unit cell and decreases with the increase in the total height of the structure for the same relative density. As the relative density increases, the buckling resistance of the lattice structure increases. It is possible to examine various buckling modes by varying the geometrical properties of the pyramid unit cell (slenderness ratio, rod inclination angle, cross-sectional size of strut connection parts). Finally, numerical simulations were performed to calculate the yield strength and buckling strength of the lattice structure under uniaxial compression load, in order to estimate the threshold relative density for structural buckling and yield failure. The results demonstrated that buckling failure should be considered for aluminum alloy pyramid lattice when the relative density is below 4.07%. This study provides design criteria for lattice structures dominated by buckling and offers ideas for improving the buckling capacity of truss-type lattice structures.
Keyword ：
yield strength yield strength local buckling local buckling global buckling global buckling critical buckling load critical buckling load buckling strength buckling strength Pyramid lattice structure Pyramid lattice structure
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| GB/T 7714 | Lu, Wanyu , Liu, Hui , Waqas, Adnan et al. Study on buckling behavior of multilayer pyramid lattice structures [J]. | MECHANICS OF ADVANCED MATERIALS AND STRUCTURES , 2023 . |
| MLA | Lu, Wanyu et al. "Study on buckling behavior of multilayer pyramid lattice structures" . | MECHANICS OF ADVANCED MATERIALS AND STRUCTURES (2023) . |
| APA | Lu, Wanyu , Liu, Hui , Waqas, Adnan , Long, Lianchun . Study on buckling behavior of multilayer pyramid lattice structures . | MECHANICS OF ADVANCED MATERIALS AND STRUCTURES , 2023 . |
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Abstract ：
An efficient and accurate equivalent design method for hybrid lattice structures is proposed. First, the equivalent mechanical properties of the lattice structures are calculated, including the equivalent elastic modulus, shear modulus, and Poisson's ratio. We construct an effective and simple stretching-bending hybrid lattice structure, which uses two types of lattice structures: stretching-dominated lattice structure and bending-dominated lattice structure. The optimal material density distributions are obtained via topological optimization by taking three-point bending beams and L-shaped beams as examples. The optimized stretching-bending hybrid lattice structures are designed based on the equivalent properties of the lattice structures. The same relative density uniform lattice structure is constructed while being compared with the stretching-bending hybrid lattice structure. The corresponding equivalent homogenization model and accurate beam model are established for comparison and verification by finite element analysis. Results show that the hybrid lattice structure has higher stiffness than the uniform lattice structure with the same relative density. The equivalent homogenized model of a hybrid lattice structure can effectively characterize the mechanical properties of the structure and improve design efficiency.
Keyword ：
Topology optimization Topology optimization Equivalent mechanical properties Equivalent mechanical properties Stretching-bending hybrid lattice structures Stretching-bending hybrid lattice structures Homogenization Homogenization
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| GB/T 7714 | Liu, Hui , Long, Lianchun . Equivalent homogenization design method for stretching-bending hybrid lattice structures [J]. | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY , 2023 , 37 (8) : 4169-4178 . |
| MLA | Liu, Hui et al. "Equivalent homogenization design method for stretching-bending hybrid lattice structures" . | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 37 . 8 (2023) : 4169-4178 . |
| APA | Liu, Hui , Long, Lianchun . Equivalent homogenization design method for stretching-bending hybrid lattice structures . | JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY , 2023 , 37 (8) , 4169-4178 . |
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Abstract ：
Molecular dynamics simulations of body-centered cubic (bcc) iron thin films with crack defects were carried out by adopting methods of EAM (Embedded Atom Method) potential, spin/exchange potential and spin/neel potential. In this article, the effects of the variation of distance between two crack defects and their directions on the magnetostrictive properties of the thin films are studied, and the corresponding microscopic mechanism is also analyzed. The results show that the defects affect the atomic magnetic moment nearby, and the magnetostrictive properties of thin iron films vary with the direction and spacing of the crack defects. If the defect spacing is constant, the iron model with crack perpendicular to the magnetization direction has stronger magnetostriction than that of parallel to the magnetization direction. The variation of the defect spacing has a great influence on the magnetostrictive properties of the iron model with crack direction parallel to magnetization direction, but it has a small effect on another perpendicular situation. The atoms between the defects may move, but if the defect spacing increases to a certain value, then none of the atoms will move.
Keyword ：
thin film thin film molecular dynamics molecular dynamics magnetostriction magnetostriction crack defects crack defects iron iron
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| GB/T 7714 | Yang, Hongwei , Zhang, Meng , Long, Lianchun . Effect of Crack Defects on Magnetostriction and Magnetic Moment Evolution of Iron Thin Films [J]. | NANOMATERIALS , 2022 , 12 (7) . |
| MLA | Yang, Hongwei et al. "Effect of Crack Defects on Magnetostriction and Magnetic Moment Evolution of Iron Thin Films" . | NANOMATERIALS 12 . 7 (2022) . |
| APA | Yang, Hongwei , Zhang, Meng , Long, Lianchun . Effect of Crack Defects on Magnetostriction and Magnetic Moment Evolution of Iron Thin Films . | NANOMATERIALS , 2022 , 12 (7) . |
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Abstract ：
The 3D lattice structures have the characteristics of lightweight and high strength, showing good energy absorption characteristics under impact loads. Herein, stretching-bending synergistic lattices are constructed, with the macroscopic backbone in the stretching-dominated configuration and the mesoscopic cells in the bending-dominated configuration. The lattices organically combine the two deformation mechanisms of stretching dominant and bending dominant to exhibit high specific strength and excellent specific energy absorption. The particular deformation model and energy absorption characteristics of the stretching-bending synergistic lattices are analyzed. The dynamic compression response of the structure is found to have a unique stress climbing mechanism, which is the critical factor in enhancing its energy absorption ability. The backbone is the main part of structural energy absorption. By changing the relative density of the backbone, the yield strength and specific energy absorption of the stretching-bending synergistic lattices can be increased by more than 78% and 142%, respectively, than the uniform lattices with the same relative density. The hierarchical structure of the stretching backbone and bending cells provides a new approach for the design of impact-resistant structures.
Keyword ：
lattice structures lattice structures stretching-bending synergistic stretching-bending synergistic energy absorption energy absorption microstructural design microstructural design dynamic compression dynamic compression
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| GB/T 7714 | Yang, Zhongliang , Liu, Hui , Wu, Qi et al. Study of Energy Absorption Characteristics and Deformation Mechanism of Stretching-Bending Synergistic Lattices Under Dynamic Compression [J]. | ADVANCED ENGINEERING MATERIALS , 2022 , 25 (4) . |
| MLA | Yang, Zhongliang et al. "Study of Energy Absorption Characteristics and Deformation Mechanism of Stretching-Bending Synergistic Lattices Under Dynamic Compression" . | ADVANCED ENGINEERING MATERIALS 25 . 4 (2022) . |
| APA | Yang, Zhongliang , Liu, Hui , Wu, Qi , Long, Lianchun . Study of Energy Absorption Characteristics and Deformation Mechanism of Stretching-Bending Synergistic Lattices Under Dynamic Compression . | ADVANCED ENGINEERING MATERIALS , 2022 , 25 (4) . |
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Abstract ：
本发明公开了一种薄膜材料接触热阻测量的实验装置及方法，涉及接触热阻测量技术领域，包括：真空容器、冷却系统、加热装置、数据采集装置、张力装置。真空腔内放置测试装置主体，设置观察口观测薄膜状态；通过张力辊将薄膜压在圆弧冷却器上，改变张力即可改变薄膜与冷却壁面间的压强；冷却器中循环通入冷却液，支架上安装有加热装置给薄膜加热，通过热像仪监测薄膜表面温度；数据采集装置包括多个温度传感器、薄膜压力传感器以及热像仪。在实验过程中，通过施加张力增加薄膜接触压强，利用采集到的温度数据以及压力数据进行计算，得到接触热阻。本发明设计出一种结构简单，低压强下测量薄膜材料接触热阻的装置，实验精度较高。
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| GB/T 7714 | 龙连春 , 蔡鹏飞 , 吴奇 . 一种薄膜材料接触热阻测量的实验装置及方法 : CN202211559281.5[P]. | 2022-12-06 . |
| MLA | 龙连春 et al. "一种薄膜材料接触热阻测量的实验装置及方法" : CN202211559281.5. | 2022-12-06 . |
| APA | 龙连春 , 蔡鹏飞 , 吴奇 . 一种薄膜材料接触热阻测量的实验装置及方法 : CN202211559281.5. | 2022-12-06 . |
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Abstract ：
本发明公开了一种基于拱结构的点阵材料，包括N个拱形点阵单胞，每个单胞由几组带拉杆的拱结构通过相互连接构成。由单胞沿空间坐标系的x和y方向阵列一定次数后再沿z方向进行镜像和阵列构成基于拱结构的点阵材料。本发明公开的基于拱结构的点阵材料在特定荷载下是一种无矩结构，其横截面内仅存在轴向作用，能更好的发挥材料性能。其水平推力与跨度有关，跨度越小，推力越小；水平推力与高度有关，高度越大，推力越小。
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| GB/T 7714 | 龙连春 , 刘慧 . 一种基于拱结构的点阵材料 : CN202211571591.9[P]. | 2022-12-08 . |
| MLA | 龙连春 et al. "一种基于拱结构的点阵材料" : CN202211571591.9. | 2022-12-08 . |
| APA | 龙连春 , 刘慧 . 一种基于拱结构的点阵材料 : CN202211571591.9. | 2022-12-08 . |
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