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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 . |
| MLA | Liu, Hui 等. "Study on plastic yield surfaces of pyramidal lattice materials with circular and rectangular cross-sections" . | MATHEMATICS AND MECHANICS OF SOLIDS (2024) . |
| 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 . |
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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 ：
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 ：
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 ：
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 ：
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 et al. "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 ：
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 ：
Multiferroic composite structures are widely used in sensing, driving and communication. The study of their magnetoelectric (ME) behavior under various excitations is crucial. This study investigates the nonlinear ME influence of a multilayer composite ring structure consisting of Terfenol-D (TD) magnetostrictive and lead zirconate titanate (PZT) piezoelectric rings utilizing a multiphysics field modeling framework based on the fully coupled finite element method. The ME coupling coefficient of the PZT/TD concentric composite ring is predicted using the linear piezoelectric constitutive model and the nonlinear magnetostrictive constitutive model, which is congruent to the experimental data. The effect of the interface area of a trilayered structure on the coupling performance at the resonant frequency is investigated, considering the magnitude and frequency of the magnetic field and keeping the material ratio constant. The ME coupling coefficient of a trilayered structure is larger than that of a bilayered structure with the same material ratio, and the maximum ME coupling coefficient of a trilayered structure increases nonlinearly with the increase in the interface area. At the resonant frequency, the structure's ME coupling performance is considerably improved. An optimization technique based on structural geometric design and magnetic field control is presented to optimize the ME coupling coefficient.
Keyword ：
Interface area Interface area Frequency Frequency Finite element simulation Finite element simulation Composite multiferroics Composite multiferroics Magnetoelectric coupling Magnetoelectric coupling
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| GB/T 7714 | Liu, Jingyi , Long, Lianchun , Li, Wei . Effect of Interface Area on Nonlinear Magnetoelectric Resonance Response of Layered Multiferroic Composite Ring [J]. | ACTA MECHANICA SOLIDA SINICA , 2022 , 35 (5) : 765-774 . |
| MLA | Liu, Jingyi et al. "Effect of Interface Area on Nonlinear Magnetoelectric Resonance Response of Layered Multiferroic Composite Ring" . | ACTA MECHANICA SOLIDA SINICA 35 . 5 (2022) : 765-774 . |
| APA | Liu, Jingyi , Long, Lianchun , Li, Wei . Effect of Interface Area on Nonlinear Magnetoelectric Resonance Response of Layered Multiferroic Composite Ring . | ACTA MECHANICA SOLIDA SINICA , 2022 , 35 (5) , 765-774 . |
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Abstract ：
Magnetic materials are important basic materials in the information age. Different magnetic ground states are the prerequisite for the wide application of magnetic materials, among which the ferromagnetic ground state is a key requirement for future high-performance magnetic materials. In this paper, machine learning is used to study the classification of ferromagnetic, antiferromagnetic, ferrimagnetic and paramagnetic ground states of inorganic magnetic materials and the prediction of magnetic moments of inorganic ferromagnetic materials. Weobtain 98888 inorganic magnetic materials data from the Materials Project database, containing material ids,chemical formulae, CIF files, magnetic ground states and magnetic moments, and extract 582 elemental and structural features for the inorganic magnetic materials by using Matminer. We design a two-step feature selection method. In the first step, RFECV is used to evaluate material features one by one to removeredundant features without degrading the model accuracy. In the second step, we rank the material features to further refine and select the most important material features for the model, and 20 material features are selected for the classification of magnetic ground states and the prediction of magnetic moments, respectively.Among the selected material features, it is found that the electronegativity, the atomic own magnetic momentand the number of unfilled electrons in the atomic peripheral orbitals all make important contributions to theclassification of magnetic ground states and the prediction of magnetic moments. We build a magnetic groundstate classification model and a magnetic moment prediction model by using the random forest, andquantitatively evaluate the machine learning models by using the 10-fold cross-validation approach, and the results show that the constructed machine learning models has sufficient accuracy and generalization capability .In the test set, the magnetic ground state classification model has an accuracy of 85.23%, a precision of 85.18%,a recall of 85.04%, and an F1 score of 85.24%; the magnetic moment prediction model has a goodness-of-fit of91.58% and an average absolute error of 0.098 mu B per atom. This study provides a new method and choice for high-throughput classification and screening of magnetic ground states of inorganic magnetic materials and predicting the magnetic moment of ferromagnetic materials
Keyword ：
magnetic ground state magnetic ground state magnetic moment magnetic moment machine learning machine learning random forest random forest
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| GB/T 7714 | Li Wei , Long Lian-Chun , Liu Jing-Yi et al. Classification of magnetic ground states and prediction of magnetic moments of inorganic magnetic materials based on machine learning [J]. | ACTA PHYSICA SINICA , 2022 , 71 (6) . |
| MLA | Li Wei et al. "Classification of magnetic ground states and prediction of magnetic moments of inorganic magnetic materials based on machine learning" . | ACTA PHYSICA SINICA 71 . 6 (2022) . |
| APA | Li Wei , Long Lian-Chun , Liu Jing-Yi , Yang Yang . Classification of magnetic ground states and prediction of magnetic moments of inorganic magnetic materials based on machine learning . | ACTA PHYSICA SINICA , 2022 , 71 (6) . |
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