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学者姓名：杨庆生
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摘要 ：
Although metamaterials with unconventional Poisson's ratios have been extensively explored for their counterintuitive and desirable properties, most exhibit only a single behavior. Here, we design novel metamaterials capable of both positive and negative Poisson's ratios, which simultaneously demonstrate outstanding performances: asymmetric, non-reciprocal, and even exceeding thermodynamic limits. These abnormal properties are achieved by combining honeycomb and re-entrant structures with self-contacting stops set at different positions. The unique topology allows for mode switching, where the unit cell can transition between "honeycomb" and "re-entrant" configurations under different load conditions. This mode convertibility endows the metamaterials not only different signs of Poisson's ratios under various load conditions in a single direction but also anisotropy in orthogonal directions. Through theoretical analysis, the deformation modes and the corresponding Poisson's ratios are predicted. Experiments and simulations then validate the intriguing Poisson's ratios and the model predictions. Notably, these Poisson's ratios can be further tailored by adjusting the initial states of the selfcontacting stops, offering a powerful tool for manipulating Poisson's ratios and unlocking new functionalities of metamaterials.
关键词 ：
Poisson's ratio Poisson's ratio Non-reciprocity Non-reciprocity Thermodynamic limit Thermodynamic limit Mechanical metamaterial Mechanical metamaterial Self-contact Self-contact
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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 [J]. | COMPOSITE STRUCTURES , 2024 , 348 . |
| MLA | Tang, Aijie 等. "Self-contacting metamaterials achieving asymmetric, non-reciprocal, and adjustable Poisson's ratios that break thermodynamic limits" . | COMPOSITE STRUCTURES 348 (2024) . |
| APA | Tang, Aijie , Yang, Qingsheng , Liu, Junjie . Self-contacting metamaterials achieving asymmetric, non-reciprocal, and adjustable Poisson's ratios that break thermodynamic limits . | COMPOSITE STRUCTURES , 2024 , 348 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Advanced composites with superior wave attenuation or vibration isolation capacity are in high demand in engineering practice. In this study, we develop the hybrid dynamic shear -lag model with Bloch's theorem to investigate the hybrid effect of reinforcement on wave attenuation in bioinspired staggered composites. We present for the first time the relationship between macroscopic wave filtering and hybridization of building blocks in staggered composites. Viscoelasticity was taken into account for both reinforcement and matrix to reflect the damping effect on wave transmission. Our findings indicate that reinforcement hybridization significantly enhances wave attenuation performance through two critical parameters: the linear stiffness and linear density of reinforcements. For purely elastic constituents, reinforcement hybridization consistently improves wave attenuation by reducing the initial frequency of the first bandgap and broadening it. For viscoelastic constituents, increasing the heterogeneity of reinforcements can benefit wave attenuation, particularly in ultralow frequency regimes, due to the strengthening of the damping effect. Our case study demonstrates that controlling the difference in linear density can result in up to a 59 % reduction in energy transmission. Our analysis suggests that hybridizing reinforcements could provide a new approach to designing and synthesizing advanced composites with exceptional wave attenuation performance.
关键词 ：
Phononic crystal Phononic crystal Hybrid effect Hybrid effect Bioinspired composites Bioinspired composites Viscoelastic wave Viscoelastic wave Wave attenuation Wave attenuation
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| GB/T 7714 | Liu, Junjie , Zhang, Hangyuan , Gao, Yang et al. Reinforcement hybridization in staggered composites enhances wave attenuation performance [J]. | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS , 2024 , 152 . |
| MLA | Liu, Junjie et al. "Reinforcement hybridization in staggered composites enhances wave attenuation performance" . | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 152 (2024) . |
| APA | Liu, Junjie , Zhang, Hangyuan , Gao, Yang , Yu, Zhongliang , Cong, Chaonan , Wei, Xiaoding et al. Reinforcement hybridization in staggered composites enhances wave attenuation performance . | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS , 2024 , 152 . |
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摘要 ：
Multi-sensing in simple devices, but with a high sensitivity and a large detection range, is desirable for soft machines. Stretchable sensors based on the resistance changes of bulk ionic hydrogels are inherently limited by the single function and low sensitivity at small deformations. Here, a design enabled by a highly cracked hydrogel (HCHG) that is hypersensitive to tensile strain, bending, and tactile force in a wide range is proposed. The mechanism relies on the continuous sharp changes of the cross-sectional area flowing ionic current when pre-cut curved cracks are closed/opened by external load. The high fracture toughness of the hydrogel inhibits the crack propagation, making the sensing robust. By designing the crack patterns, sensitivities of 80 for 0-20% tensile strain and 0.45 kPa(-1) for tactile force are achieved. Compared to the sensor made from bulk hydrogel, the sensitivities are enhanced by two and three orders of magnitude, respectively, meanwhile the detectable strain range is maintained (up to 215%). A sandwich design is also developed to distinguish elongation, compression, and bending. Applications of HCHG sensors in manipulating a robotic arm and nondestructive grasping an even softer object by a soft gripper are demonstrated.
关键词 ：
cracked hydrogels cracked hydrogels ionic sensors ionic sensors force feedback control force feedback control motion detection motion detection strain and tactile sensing strain and tactile sensing
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| GB/T 7714 | Guo, Yuhan , Guo, Haoyu , Han, Yuwei et al. Multifunctional Hydrogel Sensor with Curved Macro Cracks: A Strategy for High Sensitivity and Wide Detection Range [J]. | ADVANCED FUNCTIONAL MATERIALS , 2023 , 33 (47) . |
| MLA | Guo, Yuhan et al. "Multifunctional Hydrogel Sensor with Curved Macro Cracks: A Strategy for High Sensitivity and Wide Detection Range" . | ADVANCED FUNCTIONAL MATERIALS 33 . 47 (2023) . |
| APA | Guo, Yuhan , Guo, Haoyu , Han, Yuwei , Chen, Xi , Liu, Jinyuan , Yang, Meng et al. Multifunctional Hydrogel Sensor with Curved Macro Cracks: A Strategy for High Sensitivity and Wide Detection Range . | ADVANCED FUNCTIONAL MATERIALS , 2023 , 33 (47) . |
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摘要 ：
Owing to the possibility of controlling its specific mechanical behaviors uptaken by irradiated by light at particular wavelengths, the photoisomerization hydrogels have a broad range of potential applications. A theory connecting the optical excitation to mechanical behavior is essential to precisely control the photo-mechanical behaviors of the hydrogel. In this work, a photo-mechanical coupling theory is developed to describe the photo-mechanical responses of photoisomerization hydrogels within the framework of finite deformation continuum thermodynamics. In the model, the deformation gradient is decomposed into two parts to effectively model the light-induced deformation and the elastic one. To consider the effect of the optical excitation on mechanical behaviors, we first investigate the transporting mechanism of light in hydrogel, as well as the photochemical reaction process; and we then explore the disturbance of light irradiation on the equilibrium of the thermodynamic system of hydrogel, as well as the relationship of conformational entropy of hydrogel network with the photochemical reaction; finally, based on the entropy elasticity theory, we propose a new free energy function of the photosensitive hydrogel to consider the effect of molecular chain distribution evolution on the stiffness of the hydrogel network. With the implementation of the proposed model, we study the photomechanical behaviors and mechanical properties of photoisomerization hydrogels. The present research is helpful for understanding the multi-field coupling behaviors of the photosensitive hydrogel, and then providing guidelines for the application of photoisomerization hydrogel.
关键词 ：
Constitutive modeling Constitutive modeling Photosensitive hydrogels Photosensitive hydrogels Photo-mechanical coupling Photo-mechanical coupling Photochemical reaction Photochemical reaction Molecular chains distribution Molecular chains distribution
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| GB/T 7714 | Liu, Xinyu , Yang, Qingsheng , Rao, Wei . A photo-mechanical coupling theory for photoisomerization hydrogel considering the distribution state of molecular chains [J]. | INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES , 2023 , 283 . |
| MLA | Liu, Xinyu et al. "A photo-mechanical coupling theory for photoisomerization hydrogel considering the distribution state of molecular chains" . | INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES 283 (2023) . |
| APA | Liu, Xinyu , Yang, Qingsheng , Rao, Wei . A photo-mechanical coupling theory for photoisomerization hydrogel considering the distribution state of molecular chains . | INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES , 2023 , 283 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
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.
关键词 ：
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 et al. "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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摘要 ：
本发明公开了一种制备凝胶试样的成型装置及试样制备方法，包括：下有机板、无纺布、卡环、上有机板、卡槽、卡尺、套环；上有机板一角处留有一圆孔，圆孔内安装套环，卡尺穿过套环并紧密配合；上有机板通过沿卡尺上下移动，上有机板以卡尺为中心实现旋转；制备步骤：将套环与卡尺固定，将无纺布上的卡环与上有机板上的卡槽连接；将配置均匀的溶液通过上有机板上开设的通气孔灌注入模具中，等待凝胶试样成型；凝胶试样成型后，将无纺布上的卡环与上有机板上的卡槽解除连接，然后将套环在卡尺上进行松动，使得上有机板和卡环可沿卡尺进行上下移动和旋转，从而实现凝胶与上有机板的分离；然后将无纺布卸下，取出凝胶，将其制成实验所需样品形状。
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| GB/T 7714 | 杨庆生 , 单燕 , 郝兴楠 . 一种制备凝胶试样的成型装置及试样制备方法 : CN202211161055.1[P]. | 2022-09-22 . |
| MLA | 杨庆生 et al. "一种制备凝胶试样的成型装置及试样制备方法" : CN202211161055.1. | 2022-09-22 . |
| APA | 杨庆生 , 单燕 , 郝兴楠 . 一种制备凝胶试样的成型装置及试样制备方法 : CN202211161055.1. | 2022-09-22 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Hydrogel is one of typical smart materials and has been used in many engineering applications, such as flexible electronics, flexible robots, and biomedical engineering. Modern industries with complex working environments require hydrogel to have higher strength without losing flexibility. Many published experimental studies focus on the preparation technique of hydrogel composite with high strength and toughness. However, the theoretical investigation into the influence of entanglements on the hydrogel deformation is rarely reported for the structure analysis and deformation mechanism of hydrogel composite, as a purpose to design of hydrogel devices. In this paper, the constitutive model is developed for thermal responsive hydrogel with chain entanglements, based on Flory-Rehner theory and slip-link model, and numerically solved by a user subroutine in ABAQUS. The uniaxial tensile and compressive simulations of standard specimens are carried out to validate the proposed model and demonstrate the applicability of the hydrogel composite, in which a great agreement is obtained by comparing the simulation results to the experimental data from published work. Subsequently, the hydrogel composites with three types of structure, such as hydrogel grippers, scaffolds and skins, are designed to improve the overall strength and maintain the flexibility of the devices, inspired by the deformation mismatch characteristics of multilayer hydrogels. The results show that the properties of composite hydrogels are closely related to the level of entanglements, cross-link and composite structures. This work may contribute to the preparation of reinforced hydrogels and provide insights for the design of hydrogel multifunctional devices.
关键词 ：
mechanical properties mechanical properties composite structures composite structures finite element method finite element method chain entanglements chain entanglements Hydrogel Hydrogel
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| GB/T 7714 | Nian, Xiangchuan , Yang, Qingsheng , Ma, Lianhua et al. Constitutive modeling for hydrogel with chain entanglements and application to adaptive hydrogel composite structures [J]. | MECHANICS OF ADVANCED MATERIALS AND STRUCTURES , 2022 , 30 (24) : 5122-5136 . |
| MLA | Nian, Xiangchuan et al. "Constitutive modeling for hydrogel with chain entanglements and application to adaptive hydrogel composite structures" . | MECHANICS OF ADVANCED MATERIALS AND STRUCTURES 30 . 24 (2022) : 5122-5136 . |
| APA | Nian, Xiangchuan , Yang, Qingsheng , Ma, Lianhua , Zhang, Xingyu . Constitutive modeling for hydrogel with chain entanglements and application to adaptive hydrogel composite structures . | MECHANICS OF ADVANCED MATERIALS AND STRUCTURES , 2022 , 30 (24) , 5122-5136 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Metamaterial is a new type of structure constructed by artificially designed geometries and possessing extraordinary physical properties. However, the functions of metamaterial are currently difficult to be adjusted and switched. A novel type of multi-pattern composite metamaterial with tunable Poisson's ratio and band gap is designed and fabricated using shape memory polymers based on curved-beams. The effects of geometric parameters and temperature on pattern switching and vibration performance is investigated by using theoretical analysis, finite element simulation and experiments. Based on this new metamaterial, a bionic multi-degree-of freedom dexterous finger tube is designed and the major geometric parameters affecting its bending angle is investigated. The present intelligent regulation combining with the mechanical regulation provide a valuable contribution to the design of novel multifunctional tunable metamaterials, as well as further extending the applications in biomedical field.
关键词 ：
Multifunctional composites Multifunctional composites Vibration Vibration Smart materials Smart materials Shape memory behaviour Shape memory behaviour
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| GB/T 7714 | Wang, Jia-Xin , Liu, Xia , Yang, Qing-Sheng et al. A novel programmable composite metamaterial with tunable Poisson's ratio and bandgap based on multi-stable switching [J]. | COMPOSITES SCIENCE AND TECHNOLOGY , 2022 , 219 . |
| MLA | Wang, Jia-Xin et al. "A novel programmable composite metamaterial with tunable Poisson's ratio and bandgap based on multi-stable switching" . | COMPOSITES SCIENCE AND TECHNOLOGY 219 (2022) . |
| APA | Wang, Jia-Xin , Liu, Xia , Yang, Qing-Sheng , Tao, Ran , Li, Ying , Ma, Lian-Hua . A novel programmable composite metamaterial with tunable Poisson's ratio and bandgap based on multi-stable switching . | COMPOSITES SCIENCE AND TECHNOLOGY , 2022 , 219 . |
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摘要 ：
The structures evolved by creatures to adapt to the specific living environment have excellent mechanical properties. Studying from nature, we can get inspiration to design the structure with unparalleled mechanical properties. This paper proposed a new multi-bionic strategy, which combined the face centered cubic (FCC) structure with light weight and high specific strength and the concentric circle structure with high toughness. Those two structure were inspired by the arrangement of metal atoms and bone respectively. The multi-bionic metamaterials with different ratios of soft phase material were prepared by 3D printer. The force displacement curves of the metamaterials were obtained by quasi-static compression experiment, and compared with the lattice structure made of pure hard phase material. In addition, the failure behavior of the metamaterials and the effect of the concentric soft and hard rods on the toughness and energy absorption performance of the metamaterials were studied. Results show that for a metamaterial with soft phase ratio of 20%, the strain when rods begin to break and absorbed energy are 2 times and 3.8 times that of the pure hard phase lattice, respectively. The design strategy is not only limited to the combination of the two structures in this work, but can also guide the combination of more biological structures to optimize and customize the performance of metamaterials.
关键词 ：
Metamaterial Metamaterial Toughness Toughness Multi-bionic Multi-bionic Energy absorption Energy absorption
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| GB/T 7714 | Wei, Yu-Ling , Yang, Qing-Sheng , Liu, Xia et al. Multi-bionic mechanical metamaterials: A composite of FCC lattice and bone structures [J]. | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2022 , 213 . |
| MLA | Wei, Yu-Ling et al. "Multi-bionic mechanical metamaterials: A composite of FCC lattice and bone structures" . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 213 (2022) . |
| APA | Wei, Yu-Ling , Yang, Qing-Sheng , Liu, Xia , Tao, Ran . Multi-bionic mechanical metamaterials: A composite of FCC lattice and bone structures . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2022 , 213 . |
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摘要 ：
本发明公开了一种用于软材料测试的球形压痕实验台和实验方法，包括上台体、下台体、上夹具、下夹具、压头槽、球形压头、支撑平板；支撑平板通过固定连接装设在下夹具上；实验平台为微型原位力学试验机，通过调整磁石，实现球形压头与支撑平板之间距离的可操控性；根据试样材料的大小选择适当的球形压头，通过磁力将球形压头固定于压头槽上，使得球形压头在进行压痕实验时对准试样材料；通过调整压头槽与上夹具的连接磁石，保证球形压头与支撑平板距离；把试样材料放置于支撑平板中心处，使试样表面与球形压头表面垂直中心齐平后，通过对试验机进行操作，调节升降台使软材料表面达到与压头表面微接触，使材料表面与球形压头表面接触。
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| GB/T 7714 | 杨庆生 , 单燕 , 郝兴楠 . 一种用于软材料测试的球形压痕实验台及实验方法 : CN202211170085.9[P]. | 2022-09-22 . |
| MLA | 杨庆生 et al. "一种用于软材料测试的球形压痕实验台及实验方法" : CN202211170085.9. | 2022-09-22 . |
| APA | 杨庆生 , 单燕 , 郝兴楠 . 一种用于软材料测试的球形压痕实验台及实验方法 : CN202211170085.9. | 2022-09-22 . |
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