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学者姓名：杨庆生
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Abstract ：
In this article, we conduct a numerical simulation to investigate the failure mechanism of natural fibre-hydrogel composites under tensile deformation and swelling. Firstly, a physical-based constitutive model is chosen to describe the deformation of the hydrogel matrix. Concurrently, a macroscopic phenomenological hyperelastic constitutive model, incorporated into the material database of Abaqus, is employed to describe the mechanical responses of natural fibres. Then, we implement the model for a numerical analysis. The material parameters of the model for the hydrogel matrix and fibres are determined by a trial-and-error method from the experimental curves of pure hydrogel and fibres; the numerically simulated stress-strain curve of the composites is compared with the experimental one to verify the effectiveness of the simulation. Subsequently, several numerical analyses are performed to discuss the failure mechanism of hydrogel composites caused by the microstructural features of fibres. The findings revealed that fibre protrusion, fibre orientation deviation, and interface strength significantly affect the local failure of the composites during tensile deformation and swelling; the composites' strength and toughness mainly depend on the cooperation of various microstructural features. These results provide valuable insights into the design of fibre-hydrogel composites.
Keyword ：
natural fibre-hydrogel composites natural fibre-hydrogel composites failure failure tensile and swelling tensile and swelling microstructure features microstructure features finite element method finite element method
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| GB/T 7714 | Nian, Xiangchuan , Huang, Xiaohui , Rao, Wei et al. Numerical simulation of microstructural failure of natural fibre-hydrogel composites [J]. | PLASTICS RUBBER AND COMPOSITES , 2024 , 53 (8-10) : 200-214 . |
| MLA | Nian, Xiangchuan et al. "Numerical simulation of microstructural failure of natural fibre-hydrogel composites" . | PLASTICS RUBBER AND COMPOSITES 53 . 8-10 (2024) : 200-214 . |
| APA | Nian, Xiangchuan , Huang, Xiaohui , Rao, Wei , Yang, Qingsheng . Numerical simulation of microstructural failure of natural fibre-hydrogel composites . | PLASTICS RUBBER AND COMPOSITES , 2024 , 53 (8-10) , 200-214 . |
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Abstract ：
As a nonlocal alternative of classical continuum theory, peridynamics (PD) is mathematically compatible to discontinuities, making it particularly attractive for failure prediction. The PD theory on the other side can be computationally demanding due to its nonlocal interactions. A coupling between PD and refined higher-order finite element method (FEM) integrates their salient features. The present study proposes a computational approach to couple three-dimensional peridynamics with two-dimensional higher-order finite elements based on classical elasticity. The bond-based PD modeling is considered in a region where damage might appear while refined finite element modeling is used for the remaining region. The refined finite elements employed in this study are based on the 2D Carrera Unified Formulation (CUF), which provides 3D-like accuracy with optimized computational efficiency. The coupling between PD and FEM is achieved through the Lagrange multiplier method which permits physical consistency and compatibility at the interface domain. An adaptive convergence check algorithm is also proposed to achieve predetermined accuracy in the solution with minimum computational effort. Simulations of quasi-static tension tests, wedge splitting tests and L-plate cracking tests are carried out for verification. In-depth analysis shows that the present approach can reproduce the linear deformation, material degradation and crack propagation in an effective way.
Keyword ：
Peridynamics Peridynamics Fracture Fracture Carrera unified formulation Carrera unified formulation Higher-order plate theories Higher-order plate theories
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| GB/T 7714 | Zhang, Jing , Enea, Marco , Pagani, Alfonso et al. A computational approach to integrate three-dimensional peridynamics and two-dimensional higher-order classical elasticity theory for fracture analysis [J]. | ENGINEERING WITH COMPUTERS , 2024 . |
| MLA | Zhang, Jing et al. "A computational approach to integrate three-dimensional peridynamics and two-dimensional higher-order classical elasticity theory for fracture analysis" . | ENGINEERING WITH COMPUTERS (2024) . |
| APA | Zhang, Jing , Enea, Marco , Pagani, Alfonso , Carrera, Erasmo , Madenci, Erdogan , Liu, Xia et al. A computational approach to integrate three-dimensional peridynamics and two-dimensional higher-order classical elasticity theory for fracture analysis . | ENGINEERING WITH COMPUTERS , 2024 . |
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| GB/T 7714 | Tang, Aijie , Yang, Qingsheng , Liu, Junjie . Self-contacting metamaterials achieving asymmetric, non-reciprocal, and adjustable Poisson's ratios that break thermodynamic limits (vol 348, 118486, 2024) [J]. | COMPOSITE STRUCTURES , 2024 , 349 . |
| MLA | Tang, Aijie et al. "Self-contacting metamaterials achieving asymmetric, non-reciprocal, and adjustable Poisson's ratios that break thermodynamic limits (vol 348, 118486, 2024)" . | COMPOSITE STRUCTURES 349 (2024) . |
| APA | Tang, Aijie , Yang, Qingsheng , Liu, Junjie . Self-contacting metamaterials achieving asymmetric, non-reciprocal, and adjustable Poisson's ratios that break thermodynamic limits (vol 348, 118486, 2024) . | COMPOSITE STRUCTURES , 2024 , 349 . |
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Abstract ：
This paper studies the bending properties of carbon/epoxy composite laminates. The three-point bending simulation under different layups is performed on the carbon/epoxy composite laminate. Through the stress distributing graph of each layer and the load-displacement curve of the indenter, the influence of different layering methods on the bending performance of the material under the bending moment along the x direction is discussed.
Keyword ：
Laminate Laminate Three-point bending Three-point bending Composite Composite
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| GB/T 7714 | Lin, Xiaohu , Yang, Qingsheng , Li, Jinhua . Simulation of Three-Point Bending of Carbon/Epoxy Composite Laminates [J]. | PROCEEDINGS OF THE 2024 3RD INTERNATIONAL SYMPOSIUM ON INTELLIGENT UNMANNED SYSTEMS AND ARTIFICIAL INTELLIGENCE, SIUSAI 2024 , 2024 : 367-371 . |
| MLA | Lin, Xiaohu et al. "Simulation of Three-Point Bending of Carbon/Epoxy Composite Laminates" . | PROCEEDINGS OF THE 2024 3RD INTERNATIONAL SYMPOSIUM ON INTELLIGENT UNMANNED SYSTEMS AND ARTIFICIAL INTELLIGENCE, SIUSAI 2024 (2024) : 367-371 . |
| APA | Lin, Xiaohu , Yang, Qingsheng , Li, Jinhua . Simulation of Three-Point Bending of Carbon/Epoxy Composite Laminates . | PROCEEDINGS OF THE 2024 3RD INTERNATIONAL SYMPOSIUM ON INTELLIGENT UNMANNED SYSTEMS AND ARTIFICIAL INTELLIGENCE, SIUSAI 2024 , 2024 , 367-371 . |
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Abstract ：
This study focuses on understanding how the phase-separation process affects the toughness of random copolymer ionogels. Previous research has shown that adjusting the balance between solvophobic and solvophilic monomers within the copolymer can significantly change the mechanical properties of ionogels. This research used coarse-grained molecular dynamics simulations to analyze how phase-separation structure influences the mechanical properties of random copolymer ionogels. The results show that increasing the proportion of solvophobic monomers improves toughness up to a critical point, beyond which toughness declines due to a transition from bi-continuous to macro-phase separation. Additionally, reducing the ionic solvent content generally enhances both strength and toughness, while the ultimate strain remains nearly consistent. Stronger hydrogen bonds between solvophobic polymer segments increase rigidity but decrease toughness. This study provides important insights for designing and synthesizing high-performance copolymer ionogels.
Keyword ：
Copolymer ionogels Copolymer ionogels phase separation phase separation coarse-grained molecular dynamics coarse-grained molecular dynamics
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| GB/T 7714 | Liu, Xia , Wang, Xin , Zhang, Xingyu et al. Optimal Toughness in Copolymer Ionogels: Revealing Phase-Separation Evolution via Coarse-Grained Molecular Dynamics Simulation [J]. | INTERNATIONAL JOURNAL OF APPLIED MECHANICS , 2024 , 16 (08) . |
| MLA | Liu, Xia et al. "Optimal Toughness in Copolymer Ionogels: Revealing Phase-Separation Evolution via Coarse-Grained Molecular Dynamics Simulation" . | INTERNATIONAL JOURNAL OF APPLIED MECHANICS 16 . 08 (2024) . |
| APA | Liu, Xia , Wang, Xin , Zhang, Xingyu , Yang, Qingsheng . Optimal Toughness in Copolymer Ionogels: Revealing Phase-Separation Evolution via Coarse-Grained Molecular Dynamics Simulation . | INTERNATIONAL JOURNAL OF APPLIED MECHANICS , 2024 , 16 (08) . |
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Abstract ：
In this paper, we suggest a design strategy for multilayer hydrogel beams with controllable swelling deformation and bending, which can be used in soft devices. We adopt a constitutive model that considers the entanglement chains of the hydrogel and an analytical method for solving multilayer hydrogel beams is developed. First, the reliability of the design strategy is provided by comparing analytical solutions and numerical results. Then, guided by the above design strategy, we quantitatively investigate hydrogel beams with gradient distribution and study the effects of material and distribution on the deformation and bending behavior of the structures. The results show that under non-gradient distribution, all structures with an odd number of total layers only undergo in-plane expansion, while all those with an even number of total layers undergo expansion and bending. However, this law will be broken at the gradient distribution. The introduction of entanglement chains and gradient distribution strategy increase the range of adjustment for deformation and bending. This work is expected to provide new insights into the design of multilayer hydrogel beams for material-structure-function integration.
Keyword ：
swelling deformation swelling deformation Multilayer Multilayer hydrogel beams hydrogel beams
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| GB/T 7714 | Nian, Xiangchuan , Rao, Wei , Liu, Xia et al. Control and Analysis of Swelling Deformation of Hydrogel Beams Through Multilayer Design [J]. | INTERNATIONAL JOURNAL OF APPLIED MECHANICS , 2024 , 16 (06) . |
| MLA | Nian, Xiangchuan et al. "Control and Analysis of Swelling Deformation of Hydrogel Beams Through Multilayer Design" . | INTERNATIONAL JOURNAL OF APPLIED MECHANICS 16 . 06 (2024) . |
| APA | Nian, Xiangchuan , Rao, Wei , Liu, Xia , Shang, Junjun , Yang, Qingsheng . Control and Analysis of Swelling Deformation of Hydrogel Beams Through Multilayer Design . | INTERNATIONAL JOURNAL OF APPLIED MECHANICS , 2024 , 16 (06) . |
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Abstract ：
课程思政教育在研究生人才培养中具有重要意义和独特优势。本文阐述高质量教学与高水平育人互促共进的教书育人理念和相应的关键举措，提出以懂、悟、信、爱为核心目标、以研教融合为主要特征的研究生课程思政教育的研讨式教学新模式，创新性地落实立德树人根本任务。最后以复合材料力学课程为例，展示在研究生培养中开展课程思政教育的具体实践和育人效果。
Keyword ：
研教融合 研教融合 课程思政 课程思政 研究生培养 研究生培养
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| GB/T 7714 | 杨庆生 , 叶红玲 , 刘夏 . 研究生培养中课程思政教育的创新实践 [J]. | 中国大学教学 , 2024 , PageCount-页数: 7 (06) : 19-25 . |
| MLA | 杨庆生 et al. "研究生培养中课程思政教育的创新实践" . | 中国大学教学 PageCount-页数: 7 . 06 (2024) : 19-25 . |
| APA | 杨庆生 , 叶红玲 , 刘夏 . 研究生培养中课程思政教育的创新实践 . | 中国大学教学 , 2024 , PageCount-页数: 7 (06) , 19-25 . |
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Abstract ：
In recent years, instrumented indentation technique has been widely applied in the mechanical characterization of hydrated soft materials such as hydrogels and bio-soft tissues. However, the indentation measurement technique and properties evaluation methods for this kind of materials undergoing large deformation have not been well developed. Applying the indentation load-relaxation experiments, this paper studied the relaxation behaviors of calcium alginate/polyacrylamide double-network hydrogels under large spherical indentation deformation. The effects of temperature on the relaxation properties of calcium alginate/polyacrylamide double-network hydrogels were also measured and evaluated. This work not only helps to improve the understanding of the relaxation properties of double-network hydrogels under large deformation conditions, but also has certain guiding significance for the development of the instrumented indentation testing technology of soft materials.
Keyword ：
instrumented indentation instrumented indentation double-network hydrogels double-network hydrogels relaxation properties relaxation properties large deformation large deformation
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| GB/T 7714 | Shan, Yan , Zhang, Qiang , Yang, Qingsheng . Characterizing the Relaxation Behavior of Double-Network Hydrogels under Large Deformation by Indentation Test [J]. | MECHANICS OF SOLIDS , 2023 , 58 (3) : 890-902 . |
| MLA | Shan, Yan et al. "Characterizing the Relaxation Behavior of Double-Network Hydrogels under Large Deformation by Indentation Test" . | MECHANICS OF SOLIDS 58 . 3 (2023) : 890-902 . |
| APA | Shan, Yan , Zhang, Qiang , Yang, Qingsheng . Characterizing the Relaxation Behavior of Double-Network Hydrogels under Large Deformation by Indentation Test . | MECHANICS OF SOLIDS , 2023 , 58 (3) , 890-902 . |
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Abstract ：
The metal matrix with mixed grain-gradient structure and the graphene with different charac-teristics could be designed and prepared to ameliorate the plasticity and toughness reduction of the metal matrix composites (MMCs) caused by graphene reinforcement. However, the rela-tionship between the microstructure and the mechanical properties of composites needs to be investigated. In this paper, a self-developed structural modeling program is employed to design and establish a single-edge notch tensile finite element model of the graphene reinforced grain -gradient aluminum (Al) matrix composites, where the distribution and morphology of gra-phene and grains can be redistributed. Then, the grain size dependence of yield strength is introduced into the developed crystal plasticity finite element method (CPFEM) according to the classical Hall-Petch relationship, the damage mechanism of the graphene/Al composites with various designed novel microstructures is analyzed in combination with the cohesive zone model (CZM), and the microstructure of the graphene/Al composites with optimal mechanical properties is obtained. In addition, it is found that the failure mode, strength and toughness of the com-posites could be ameliorated by adjusting the bonding state of graphene-Al interface. This study provides a new insight into the microstructure design and fabrication of the graphene/Al com-posites with optimal comprehensive properties.
Keyword ：
Grain -gradient graphene Grain -gradient graphene Microstructure design Microstructure design Crystal plasticity Crystal plasticity Mechanical properties Mechanical properties Cohesive zone model Cohesive zone model Damage mechanism Damage mechanism Al composites Al composites
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| GB/T 7714 | Liu, Li-Ya , Yang, Qing-Sheng , Liu, Xia . Microstructure design and mechanical properties of grain-gradient graphene/aluminum composites [J]. | ENGINEERING FRACTURE MECHANICS , 2023 , 277 . |
| MLA | Liu, Li-Ya et al. "Microstructure design and mechanical properties of grain-gradient graphene/aluminum composites" . | ENGINEERING FRACTURE MECHANICS 277 (2023) . |
| APA | Liu, Li-Ya , Yang, Qing-Sheng , Liu, Xia . Microstructure design and mechanical properties of grain-gradient graphene/aluminum composites . | ENGINEERING FRACTURE MECHANICS , 2023 , 277 . |
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Abstract ：
The permeation of marine water can lead to severe degradation of the protective properties of polymer composite coatings. At present, experimental studies on the anticorrosive and mechanical properties of polymer composite coatings are relatively mature, but the impermeability and mechanical property changes of the coating during the permeation process are challenging tasks to be studied only by experiments. In this paper, molecular dynamics (MD) models of composite coatings consisting of pure epoxy resin (EP), graphene/epoxy resin (Gr/EP), and graphene oxide/epoxy resin (GO/EP) were constructed respectively. MD simulations were performed to reveal the impermeability and mechanical property changes of composite coatings from an atomic perspective. The results show that GO has strong interfacial interaction with EP and the best effect to enhance the impermeability and mechanical properties of epoxy coatings. NaCl solutions can damage the coating microstructure and occupy the Gr and GO surfaces, causing them to no longer have an enhancing effect. The study of GO/EP coatings with different permeation degrees shows that the mechanical properties of the coating decrease as the penetration degree increases.
Keyword ：
impermeability impermeability composite coatings composite coatings epoxy resin epoxy resin mechanical properties mechanical properties MD simulations MD simulations
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| GB/T 7714 | Li, Ji-Qiang , Shang, Jun-Jun , Yang, Qing-Sheng . Study on the evolution of impermeability and mechanical properties of epoxy composite coatings [J]. | POLYMER COMPOSITES , 2023 , 44 (10) : 6736-6746 . |
| MLA | Li, Ji-Qiang et al. "Study on the evolution of impermeability and mechanical properties of epoxy composite coatings" . | POLYMER COMPOSITES 44 . 10 (2023) : 6736-6746 . |
| APA | Li, Ji-Qiang , Shang, Jun-Jun , Yang, Qing-Sheng . Study on the evolution of impermeability and mechanical properties of epoxy composite coatings . | POLYMER COMPOSITES , 2023 , 44 (10) , 6736-6746 . |
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