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学者姓名：杨庆生
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Abstract ：
This paper presents a novel peridynamics (PD) methodology and implementation approach for predicting the ductile fracture of elasto-viscoplastic materials. The proposed analysis model consists of three components: 1) an elasto-viscoplastic constitutive model based on modified Bodner-Partom (BP) constitutive theory; 2) bond damage prediction based on Wang's unified damage theory; 3) crack growth prediction using the PD critical bond stretch criterion. The PD model for BP materials is realized under the ordinary state-based PD framework to define the bond-wise relationship between deformation state and force state. The use of a unified consti-tutive theory endows the present model with the characteristic of no yield criterion. In addition, the non-local nature of the PD framework allows discontinuities to naturally occur, thereby ensuring the present model can capture the initiation and propagation of ductile fracture. Sim-ulations of the standard tension tests and mode-I compact tension tests were carried out to demonstrate the use of the PD model for BP materials in practical problems. Particle-wise in-dicators, representing the intensities of plasticity, damage and fracture, were extracted for post -processing. An in-depth analysis shows that the presented PD model for BP materials can effec-tively reproduce ductile fractures at the macro-scale, allowing a general PD description of ductile behavior, which brings a new outlook for the application of PD methods.
Keyword ：
Peridynamics Peridynamics Bodner-Partom theory Bodner-Partom theory Ductile fracture Ductile fracture Elasto-viscoplastic materials Elasto-viscoplastic materials
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| GB/T 7714 | Zhang, Jing , Yang, Qing-sheng , Liu, Xia . Peridynamics methodology for elasto-viscoplastic ductile fracture [J]. | ENGINEERING FRACTURE MECHANICS , 2023 , 277 . |
| MLA | Zhang, Jing 等. "Peridynamics methodology for elasto-viscoplastic ductile fracture" . | ENGINEERING FRACTURE MECHANICS 277 (2023) . |
| APA | Zhang, Jing , Yang, Qing-sheng , Liu, Xia . Peridynamics methodology for elasto-viscoplastic ductile fracture . | ENGINEERING FRACTURE MECHANICS , 2023 , 277 . |
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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 等. "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 ：
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 等. "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 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 等. "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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Abstract ：
In this work, a constitutive model is developed to consider the effect of arbitrary fiber distribution on the swelling and tensile deformations of fiber-reinforced hydrogels. In the model, the free energy of total system is divided into two parts, i.e., the hydrogel contribution and fiber phase one. For hydrogel subsystem, we adopt the hydrogel free energy function of Flory-Rehner so that the swelling characteristic of hydrogel can be well captured; for the fiber, a statistical method is used to construct its free energy function. To effectively model the effect of fiber distribution, a principal invariant and dispersion coefficient are introduced so that the quantitative relationship between fiber distribution and anisotropy of material can be well described. Furthermore, through the analytical method or finite element implementation, both the swelling and tensile deformations of hydrogel composites with different fiber distributions are investigated. The modeling results show that the model can not only quantitatively predict the swelling and tensile deformations, but also can capture the effect of fiber distribution on the mechanical response of hydrogel composites. The new model may be helpful to the design and optimization of hydrogel composites.
Keyword ：
Fiber-reinforced composites Fiber-reinforced composites Hydrogel Hydrogel Mechanical behaviors Mechanical behaviors Constitutive model Constitutive model Fiber distributions Fiber distributions
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| GB/T 7714 | Nian, Xiangchuan , Yang, Qingsheng , Rao, Wei . Constitutive modeling for hydrogel composites with arbitrary fiber distribution [J]. | COMPOSITE STRUCTURES , 2023 , 321 . |
| MLA | Nian, Xiangchuan 等. "Constitutive modeling for hydrogel composites with arbitrary fiber distribution" . | COMPOSITE STRUCTURES 321 (2023) . |
| APA | Nian, Xiangchuan , Yang, Qingsheng , Rao, Wei . Constitutive modeling for hydrogel composites with arbitrary fiber distribution . | COMPOSITE STRUCTURES , 2023 , 321 . |
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Abstract ：
Peridynamics (PD), as an alternative formulation of classical continuum mechanics, is a powerful method for predicting the spontaneous initiation and propagation of cracks. In this paper, a unified elasto-viscoplastic peridynamics model, named the Bodner-Partom theory-based Peridynamics (BPPD) model, is proposed to describe the whole deformation-damage-fracture process for both brittle and ductile materials under impact loadings. It defines the bond-wise elasto-viscoplastic deformation by incorporating the Bodner-Partom's (B-P) constitutive theory into the ordinary state-based PD framework. In BPPD model, the bond deterioration is introduced as an intrinsic variable coupled with the modified B-P theory and the bond fracture is realized by the critical bond stretch model. The proposed BPPD model permits the natural development of plastic deformation and material deterioration, which shares the same vision as PD theory. Equipped with the elastic short-range force contact model, the present study further investigates the modelling capacity of the BPPD model under various impact loadings. Simulations for brittle drop-ball test, Taylor impact test and ballistic penetration test show a good agreement between numerical results and experiment data. The proposed BPPD model can accu-rately capture the whole deformation processes of various impact fractures and thus contribute a new diversity to the development of PD theory and a new perspective to the understanding of material fracture mechanism.
Keyword ：
brittle fracture brittle fracture peridynamics peridynamics ductile fracture ductile fracture elasto-viscoplastic deformation elasto-viscoplastic deformation impact impact
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| GB/T 7714 | Zhang, Jing , Liu, Xia , Yang, Qing-sheng . A unified elasto-viscoplastic peridynamics model for brittle and ductile fractures under high-velocity impact loading [J]. | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2022 , 173 . |
| MLA | Zhang, Jing 等. "A unified elasto-viscoplastic peridynamics model for brittle and ductile fractures under high-velocity impact loading" . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 173 (2022) . |
| APA | Zhang, Jing , Liu, Xia , Yang, Qing-sheng . A unified elasto-viscoplastic peridynamics model for brittle and ductile fractures under high-velocity impact loading . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2022 , 173 . |
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Abstract ：
Stretchable strain sensors of conductive hydrogels have been widely used in wearable devices and soft robotics. These applications have posed combinational requirements for hydrogels: high fatigue resistance, low hysteresis, and high electrical sensitivity. This combination is hardly realized. Here we propose a composite design principle to fabricate conductive hydrogels with multiple outstanding properties in both mechanical and electrical tests. One phase of the composite hydrogel is a regular polyacrylamide (PAAm) hydrogel, and the other phase is a highly entangled conductive PAAm hydrogel. The topological polymer network of each hydrogel phase is tuned by changing the density of the crosslink and entanglement to achieve different mechanical properties. The composite hydrogel shows a high fatigue threshold (similar to 330 J m(-2)), low hysteresis (<3%), high resolution (1%), and wide range (0-200%) of strain sensing capabilities. In particular, hysteresis is one order of magnitude lower than that of reported conductive hydrogels and elastomers. These merits qualify the strain sensor for monitoring cyclic motion signals, such as bending of joints (fingers, wrists, elbows, and knees), moving of a robotic arm, and beating of a porcine heart in vitro. The resistance of the sensor changes accordingly with the beating of the heart for 500 cycles. This strain sensor of composite hydrogels with high fatigue resistance and low hysteresis may open new opportunities in stretchable electronics and soft robotics.
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| GB/T 7714 | Liu, Jinyuan , Chen, Xi , Sun, Bonan et al. Stretchable strain sensor of composite hydrogels with high fatigue resistance and low hysteresis [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2022 , 10 (48) : 25564-25574 . |
| MLA | Liu, Jinyuan et al. "Stretchable strain sensor of composite hydrogels with high fatigue resistance and low hysteresis" . | JOURNAL OF MATERIALS CHEMISTRY A 10 . 48 (2022) : 25564-25574 . |
| APA | Liu, Jinyuan , Chen, Xi , Sun, Bonan , Guo, Haoyu , Guo, Yuhan , Zhang, Shengyuan et al. Stretchable strain sensor of composite hydrogels with high fatigue resistance and low hysteresis . | JOURNAL OF MATERIALS CHEMISTRY A , 2022 , 10 (48) , 25564-25574 . |
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Abstract ：
纤维增强复合材料(Fiber Reinforced Composite,FRC)具有质轻而硬、不导电、机械强度高、回收利用少、耐腐蚀等特点,被广泛应用于桥梁工程、海洋工程及地下工程中。本文分析了在周期性边界条件下的纤维增强复合微结构力学模型,并根据纤维和基体各自的属性计算其弹性模量和热属性。根据代表体元法(Representation Volume Element,RVE)结果与根据混合定律(Rule of Mixture,ROM)获得的结果进行比较分析,得到在不同泊松比情况下单元周期性与混合定律的弹性与热属性的关系。
Keyword ：
微结构力学模型 微结构力学模型 弹性模量 弹性模量 纤维增强复合材料 纤维增强复合材料 热属性 热属性
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| GB/T 7714 | 赵佳卓 , 杨庆生 . 基于代表体元法和混合定律的纤维增强复合材料性能分析 [C] //北京力学会第二十八届学术年会论文集（上） . 2022 . |
| MLA | 赵佳卓 et al. "基于代表体元法和混合定律的纤维增强复合材料性能分析" 北京力学会第二十八届学术年会论文集（上） . (2022) . |
| APA | 赵佳卓 , 杨庆生 . 基于代表体元法和混合定律的纤维增强复合材料性能分析 北京力学会第二十八届学术年会论文集（上） . (2022) . |
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Abstract ：
碳纤维/环氧树脂复合材料因其强度高、密度小、耐高温等特性,广泛地使用于航空航天、车辆制造业、体育制造业等需要轻质高强材料的行业。研究碳纤维/环氧树脂复合板材在常温常压的力学性能具有重要意义。本文以T300/AG80碳纤维/环氧树脂复合材料层合板为研究对象,通过测试常温下碳纤维/环氧树脂复合材料标准试件的横向、纵向两个方向的轴向拉伸破坏载荷与变形,得到该材料的拉伸应力-应变曲线,并对其破坏过程与铺层角度对力学性能的影响进行分析。
Keyword ：
轴向拉伸 轴向拉伸 有限元分析 有限元分析 力学性能 力学性能 碳纤维/环氧树脂复合材料 碳纤维/环氧树脂复合材料
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| GB/T 7714 | 郝培宇 , 房天启 , 饶威 et al. 碳纤维复合材料层合板拉伸变形与破坏的实验研究 [C] //北京力学会第二十八届学术年会论文集（上） . 2022 . |
| MLA | 郝培宇 et al. "碳纤维复合材料层合板拉伸变形与破坏的实验研究" 北京力学会第二十八届学术年会论文集（上） . (2022) . |
| APA | 郝培宇 , 房天启 , 饶威 , 杨庆生 . 碳纤维复合材料层合板拉伸变形与破坏的实验研究 北京力学会第二十八届学术年会论文集（上） . (2022) . |
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Abstract ：
本文通过ABAQUS软件建立铲斗系统的模型,并对其进行了模态分析,研究其固有频率和振型,根据铲斗的振型图,可以得出如果在工作过程中发生共振会造成不稳定,因此要求设计时确认其所需要的工作载荷量值,以使最低的振动频率高于共振频率,所以分析结构固有频率就显得十分重要。
Keyword ：
模态分析 模态分析 铲斗系统 铲斗系统
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| GB/T 7714 | 武梦飞 , 杨庆生 . 铲斗系统的振动分析 [C] //北京力学会第二十八届学术年会论文集（上） . 2022 . |
| MLA | 武梦飞 et al. "铲斗系统的振动分析" 北京力学会第二十八届学术年会论文集（上） . (2022) . |
| APA | 武梦飞 , 杨庆生 . 铲斗系统的振动分析 北京力学会第二十八届学术年会论文集（上） . (2022) . |
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