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学者姓名：王铁军
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Abstract ：
Wave steering by artificial materials (for example, phononic crystals and acoustic metamaterials) is a fascinating frontier in modern physics and engineering, but suffers from bulky sizes and intractable challenges in fabrication. A sparse layer of identical tiny scatters, which we call metafence, is presented here in a non-destructive way to omnidirectionally block and arbitrarily channel flexural mechanical waves in plates. The underlying mechanism is that the restraining force and moment of the scatter are tuned simultaneously to counter-balance the incident wave. Both our experimental results and numerical analysis have demonstrated that broadband wave sources ranging from 3 to 7 kHz can be segregated from the protected area by the metafence. The metafence is also assembled into a waveguide routing with an arbitrary configuration. Compared with previous isolators and waveguides, our metafences exhibit absolute advantages in compact size, flexible configuration, and high structural strength. The current scenario sheds light on the design of lightweight-and-strong architectures for vibration control and energy harvesting with a high efficiency, and can be extended to microfluidics, acoustics, seismology and other fields. (C) 2022 Elsevier Ltd. All rights reserved.
Keyword ：
Meta-fences Metamaterials Phononic crystals Waveguide Wave isolation
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| GB/T 7714 | Zhang, Yunhao , Sha, Zhendong , Su, Guangyuan et al. Ultra-compact metafence to block and channel mechanical waves [J]. | EXTREME MECHANICS LETTERS , 2022 , 52 . |
| MLA | Zhang, Yunhao et al. "Ultra-compact metafence to block and channel mechanical waves" . | EXTREME MECHANICS LETTERS 52 (2022) . |
| APA | Zhang, Yunhao , Sha, Zhendong , Su, Guangyuan , Zhou, Hao , Jiang, Peng , Liu, Yongquan et al. Ultra-compact metafence to block and channel mechanical waves . | EXTREME MECHANICS LETTERS , 2022 , 52 . |
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Abstract ：
Magnetic hydrogels have demonstrated great potential in soft robots, drug delivery, and bioengineering, and their functions are usually determined by the deforming capability. However, most magnetic hydrogels are embedded with soft magnetic particles (e.g. Fe3O4), where the magnetic domains cannot be programmed and retained under external magnetic fields. Here, we present a strategy to prepare a microgel-reinforced magnetic hydrogel, embedded with hard magnetic NdFeB particles. These magnetic hydrogels show outstanding mechanical properties (ultimate stretching ratio >15 and fracture toughness >15 000 J m(-2)) and fast actuation speed under external magnetic fields. We use direct ink writing to fabricate magnetic hydrogels with sophisticated geometry and program their magnetization to achieve complex deformations. Fast, reversible, shape-changing structures have been demonstrated with printed magnetic hydrogels. It is hoped that this material system of hard magnetic hydrogels can open opportunities for wide applications.
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| GB/T 7714 | Tang, Jingda , Sun, Bonan , Yin, Qianfeng et al. 3D printable, tough, magnetic hydrogels with programmed magnetization for fast actuation [J]. | JOURNAL OF MATERIALS CHEMISTRY B , 2021 , 9 (44) : 9183-9190 . |
| MLA | Tang, Jingda et al. "3D printable, tough, magnetic hydrogels with programmed magnetization for fast actuation" . | JOURNAL OF MATERIALS CHEMISTRY B 9 . 44 (2021) : 9183-9190 . |
| APA | Tang, Jingda , Sun, Bonan , Yin, Qianfeng , Yang, Meng , Hu, Jian , Wang, Tiejun . 3D printable, tough, magnetic hydrogels with programmed magnetization for fast actuation . | JOURNAL OF MATERIALS CHEMISTRY B , 2021 , 9 (44) , 9183-9190 . |
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Abstract ：
The continuously density-graded cellular materials have great potential to mitigate the impact damage of structures under intensive loading. In this article, we theoretically and numerically investigate the uniaxial crushing of continuously density-graded cellular cores in sandwich plates subjected to impulsive loading. Four types of core density distribution are investigated: positive, negative, middle-high and middle-low. The theoretical predictions agree well with the 2D Voronoi finite element results. Based on the yield acceleration function, it is found that different shock modes may occur in the crushing core, depending strongly on the core density gradient. Discussions on maximizing the densification impulse and mitigating the back-face acceleration show that density-graded cellular materials may be helpful in optimization of the sandwich plates.
Keyword ：
Crushing Density-graded cellular material Impulsive loading Sandwich plate Shock wave
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| GB/T 7714 | Yang, Yan , Qin, Qinghua , Zheng, Jie et al. Uniaxial crushing of sandwich plates with continuously density-graded cellular cores subjected to impulsive loading [J]. | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS , 2021 , 90 . |
| MLA | Yang, Yan et al. "Uniaxial crushing of sandwich plates with continuously density-graded cellular cores subjected to impulsive loading" . | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS 90 (2021) . |
| APA | Yang, Yan , Qin, Qinghua , Zheng, Jie , Wang, T. J. . Uniaxial crushing of sandwich plates with continuously density-graded cellular cores subjected to impulsive loading . | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS , 2021 , 90 . |
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Abstract ：
As 2D materials with subwavelength thicknesses, elastic metasurfaces show remarkable abilities to manipulate elastic waves at will through artificial boundary conditions. However, current elastic metasurfaces are still far away from arbitrary wave manipulations since they just play a role of phase compensator. Herein, we present the next generation of elastic metasurfaces by incorporating amplitude discontinuities as an additional degree of freedom. A general theory predicting target wave fields steered by metasurfaces is proposed by modifying the Huygens-Fresnel principle. As examples, two amplitude-shift metasurfaces concerning flexural waves in thin plates are carried out: one is to transform a cylindrical wave into a Gaussian beam by elaborating both amplitude and phase shifts, and the other one is to focus incident waves by metasurfaces of amplitude modulations only. These examples coincide well over theoretical calculations, numerical simulations, and experimental tests. This work may underlie the design of metasurfaces with complete control over guided elastic waves and may extend to more sophisticated applications, such as analog signal processing and holographic imaging.
Keyword ：
amplitude elastic wave Huygens-Fresnel principle metasurface phase
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| GB/T 7714 | Su, Guangyuan , Zhang, Yunhao , Liu, Yongquan et al. Steering Flexural Waves by Amplitude-Shift Elastic Metasurfaces [J]. | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME , 2021 , 88 (5) . |
| MLA | Su, Guangyuan et al. "Steering Flexural Waves by Amplitude-Shift Elastic Metasurfaces" . | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME 88 . 5 (2021) . |
| APA | Su, Guangyuan , Zhang, Yunhao , Liu, Yongquan , Wang, Tiejun . Steering Flexural Waves by Amplitude-Shift Elastic Metasurfaces . | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME , 2021 , 88 (5) . |
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Abstract ：
Y Recent advances in soft magnetic nanocomposites have enabled myriads of magnetic robots with programmable shape transformation, shedding light on various biomedical applications. However, the complex shape transformation of magnetic hydrogels remains a challenge because of their ultralow magnetization and simple geometry. Here we demonstrate an approach to meet this challenge by fabricating composite structures of magnetic hydrogels and elastomers with extrusion-based 3D printing. Under an alternating magnetic field, magneto-thermo-sensitive hydrogels - poly(N- isopropylacrylamide) (PNIPAm) embedding Fe3O4 nanoparticles, can undergo abrupt volume collapse due to magnetothermal effect. The mismatch in the responsiveness of magnetic hydrogels and elastomers enables the shape transformation of the composite structure. We have printed magnetic hydrogels with various geometries and achieved complex shape transformation of the composite structure. The shape transformative structure can simultaneously encase and kill cancer cells (human malignant melanoma cells) through magnetic hyperthermia. similar to 50% of cancer cells can be killed by the heated magnetic hydrogel during deformation. This approach may open opportunities for applications in medicine and bioengineering. (C) 2021 Elsevier Ltd. All rights reserved.
Keyword ：
3D printing Cancer therapy Hyperthermia Magnetic hydrogel Shape transformation
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| GB/T 7714 | Tang, Jingda , Yin, Qianfeng , Shi, Mengting et al. Programmable shape transformation of 3D printed magnetic hydrogel composite for hyperthermia cancer therapy [J]. | EXTREME MECHANICS LETTERS , 2021 , 46 . |
| MLA | Tang, Jingda et al. "Programmable shape transformation of 3D printed magnetic hydrogel composite for hyperthermia cancer therapy" . | EXTREME MECHANICS LETTERS 46 (2021) . |
| APA | Tang, Jingda , Yin, Qianfeng , Shi, Mengting , Yang, Meng , Yang, Hang , Sun, Bonan et al. Programmable shape transformation of 3D printed magnetic hydrogel composite for hyperthermia cancer therapy . | EXTREME MECHANICS LETTERS , 2021 , 46 . |
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Abstract ：
Developing high-efficient and high-quality joining method for thermoset composites has long been an important goal in industry. However, conventional bonding methods are limited by the challenge of establishing covalent bonds at the interface between the thermosets. Hot-pressing welding approaches using dynamic covalent chemistry have shown good potential but the reported methods could not obtain high strength that can meet industrial needs. In this paper, we developed a new intrinsic bonding method by using highly permeable pre-polymerized vitrimer adhesive to trigger bond exchange reactions at the interface between the adhesive and the commercial composite. Our experiments showed that this new method offered excellent bonding performance. Specifically, the shear strength could reach 25 MPa by using the vitrimer adhesive after heating at 130 degrees C for 25 min. This strength was close to or higher than the interlaminar strength of the composites used in this study, as evidenced by the severe fiber-tear failure accompanied by the delamination of woven fiber layers in the lap shear tests. These results indicate that the new method can be used to build strong bonding joints in commercial thermoset composites for practical applications.
Keyword ：
Adhesion Joints/joining Mechanical testing Polymer-matrix composites (PMCs)
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| GB/T 7714 | Chen, Zhiqiang , Shi, Qian , Kuang, Xiao et al. Ultrastrong intrinsic bonding for thermoset composites via bond exchange reactions [J]. | COMPOSITES PART B-ENGINEERING , 2020 , 194 . |
| MLA | Chen, Zhiqiang et al. "Ultrastrong intrinsic bonding for thermoset composites via bond exchange reactions" . | COMPOSITES PART B-ENGINEERING 194 (2020) . |
| APA | Chen, Zhiqiang , Shi, Qian , Kuang, Xiao , Qi, H. Jerry , Wang, Tiejun . Ultrastrong intrinsic bonding for thermoset composites via bond exchange reactions . | COMPOSITES PART B-ENGINEERING , 2020 , 194 . |
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Abstract ：
Green and sustainable polymeric-matrix composites have recently attracted much scientific and industrial attention. Naturally derived materials (e.g., chitin and cellulose) have been extensively studied due to their abundant availability and environmental appeal. Vitrimer, combining the properties of traditional thermosets and thermoplastics, has emerged as an attractive alternative for composite matrix. Here, two hot-debated materials were combined to fabricate the layered chitin-vitrimer composite with enhanced modulus, reprocessability, and smart actuator function. We utilized an ionic liquid assisted method to prepare the chitin films with ordered microstructures. The chitin-vitrimer composites exhibited a unique two-stage stress-strain behavior, and their failure behaviors were discussed from the angle of fracture mechanics. The composites showed weldability and recyclability under the hot-pressing treatment. In addition, the welded bilayer structure demonstrated a smart actuator function on the basis of the shape memory effect. Furthermore, the simple but efficient fabrication strategy could provide an avenue to apply dynamic chemistries and natural materials in the green and sustainable industry.
Keyword ：
Chitin Composite Recycle Vitrimer Weld
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| GB/T 7714 | Chen, Zhiqiang , Wang, Jintian , Qi, H. Jerry et al. Green and Sustainable Layered Chitin-Vitrimer Composite with Enhanced Modulus, Reprocessability, and Smart Actuator Function [J]. | ACS SUSTAINABLE CHEMISTRY & ENGINEERING , 2020 , 8 (40) : 15168-15178 . |
| MLA | Chen, Zhiqiang et al. "Green and Sustainable Layered Chitin-Vitrimer Composite with Enhanced Modulus, Reprocessability, and Smart Actuator Function" . | ACS SUSTAINABLE CHEMISTRY & ENGINEERING 8 . 40 (2020) : 15168-15178 . |
| APA | Chen, Zhiqiang , Wang, Jintian , Qi, H. Jerry , Wang, Tiejun , Naguib, Hani E. . Green and Sustainable Layered Chitin-Vitrimer Composite with Enhanced Modulus, Reprocessability, and Smart Actuator Function . | ACS SUSTAINABLE CHEMISTRY & ENGINEERING , 2020 , 8 (40) , 15168-15178 . |
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Abstract ：
In this paper, low-velocity impact of square columns filled with density-graded foam (DGF) is investigated experimentally, numerically and analytically. The low-velocity impact experiments are carried out to study the effect of density gradient on the deformation patterns and energy absorption of the DGF-filled columns. Numerical calculations are performed to study the effects of density distribution mode, density difference, average density of DGF and wall thickness of square column on the energy absorption. According to the energy method and basic folding element theory, the instantaneous dynamic crushing force is predicted analytically. The analytical predications are in good agreement with experimental results. It is found that the DGF-filled columns have excellent energy absorption capacity and low initial peak force compared to the uniform-filled columns with the same weight.
Keyword ：
Density-graded foam dynamic response energy absorption low-velocity impact square column
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| GB/T 7714 | Yu, Xuehui , Qin, Qinghua , Zhang, Jianxun et al. Low-velocity impact of density-graded foam-filled square columns [J]. | INTERNATIONAL JOURNAL OF CRASHWORTHINESS , 2020 , 27 (2) : 376-389 . |
| MLA | Yu, Xuehui et al. "Low-velocity impact of density-graded foam-filled square columns" . | INTERNATIONAL JOURNAL OF CRASHWORTHINESS 27 . 2 (2020) : 376-389 . |
| APA | Yu, Xuehui , Qin, Qinghua , Zhang, Jianxun , Wang, Mingshi , Xiang, Chunping , Wang, Tiejun . Low-velocity impact of density-graded foam-filled square columns . | INTERNATIONAL JOURNAL OF CRASHWORTHINESS , 2020 , 27 (2) , 376-389 . |
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Abstract ：
In the past decade, the development of theory has deeply revealed the electromechanical coupling deformation mechanism of dielectric elastomer (DE). Many theoretical predictions on highly nonlinear deformation of dielectric elastomer have been verified by experiments. With the guidance of theory, the voltage-induced areal strain of dielectric elastomer has been increased from 100% in the pioneering work to the current record of 2200% and the energy density of a dielectric elastomer generator has reached 780 mJ/g. Much more developments have been realized on the applications of DE transducers in the fields of bioinspired artificial muscles, soft robotics, tunable lenses, and haptic interfaces. However, there is a gap between theory and application. Great potentials of developing DE transducers with the aid of a systematic theory have yet to be explored. This paper reviews the recent advances in the theory of dielectric elastomer and demonstrates some examples of using theory to design DE transducers. 9 boundary value problems of DE structures are analyzed from the simplest homogeneous deformation of a flat membrane to the highly complex bifurcations of a tube. Comparisons between theory and experiment are discussed. The viscous effect and the vibration of dielectric elastomer are reviewed. The developments of DE transducers and new dielectric materials are also reviewed. We summarize the performance of existing DE transducers with different configurations and make some discussions. It is hoped that the mechanics of DE structures can help to develop high-performance DE transducers in the future. © 2020 Elsevier Ltd
Keyword ：
Boundary value problems Deformation Dielectric materials Elastomers Electromechanical coupling Haptic interfaces Plastics Transducers
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| GB/T 7714 | Lu, Tongqing , Ma, Cheng , Wang, Tiejun . Mechanics of dielectric elastomer structures: A review [J]. | Extreme Mechanics Letters , 2020 , 38 . |
| MLA | Lu, Tongqing et al. "Mechanics of dielectric elastomer structures: A review" . | Extreme Mechanics Letters 38 (2020) . |
| APA | Lu, Tongqing , Ma, Cheng , Wang, Tiejun . Mechanics of dielectric elastomer structures: A review . | Extreme Mechanics Letters , 2020 , 38 . |
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Abstract ：
Recent decades have seen intense developments of hydrogel applications for cell cultures, tissue engineering, soft robotics, and ionic devices. Advanced fabrication techniques for hydrogel structures are being developed to meet user-specified requirements. Existing hydrogel 3D printing techniques place substantial constraints on the physical and chemical properties of hydrogel precursors as well as the printed hydrogel structures. This study proposes a novel method for patterning liquids with a resolution of 100 mu m by using the capacitor edge effect. We establish a complete hydrogel 3D printing system combining the patterning and stacking processes. This technique is applicable to a wide variety of hydrogels, overcoming the limitations of existing techniques. We demonstrate printed hydrogel structures including a hydrogel scaffold, a hydrogel composite that responds sensitively to temperature, and an ionic high-integrity hydrogel display device. The proposed technique offers great opportunities in rapid prototyping hydrogel devices using multiple compositions and complex geometries.
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| GB/T 7714 | Wang, Jikun , Lu, Tongqing , Yang, Meng et al. Hydrogel 3D printing with the capacitor edge effect [J]. | SCIENCE ADVANCES , 2019 , 5 (3) . |
| MLA | Wang, Jikun et al. "Hydrogel 3D printing with the capacitor edge effect" . | SCIENCE ADVANCES 5 . 3 (2019) . |
| APA | Wang, Jikun , Lu, Tongqing , Yang, Meng , Sun, Danqi , Xia, Yukun , Wang, Tiejun . Hydrogel 3D printing with the capacitor edge effect . | SCIENCE ADVANCES , 2019 , 5 (3) . |
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