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学者姓名:王铁军

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Ultra-compact metafence to block and channel mechanical waves EI SCIE Scopus
期刊论文 | 2022 , 52 | EXTREME MECHANICS LETTERS
SCOPUS Cited Count: 6
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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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Uniaxial crushing of sandwich plates with continuously density-graded cellular cores subjected to impulsive loading EI SCIE
期刊论文 | 2021 , 90 | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
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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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Programmable shape transformation of 3D printed magnetic hydrogel composite for hyperthermia cancer therapy EI SCIE
期刊论文 | 2021 , 46 | EXTREME MECHANICS LETTERS
WoS CC Cited Count: 11
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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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3D printable, tough, magnetic hydrogels with programmed magnetization for fast actuation EI SCIE PubMed
期刊论文 | 2021 , 9 (44) , 9183-9190 | JOURNAL OF MATERIALS CHEMISTRY B
WoS CC Cited Count: 1
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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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Steering Flexural Waves by Amplitude-Shift Elastic Metasurfaces EI SCIE
期刊论文 | 2021 , 88 (5) | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
WoS CC Cited Count: 5
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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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Ultrastrong intrinsic bonding for thermoset composites via bond exchange reactions EI SCIE
期刊论文 | 2020 , 194 | COMPOSITES PART B-ENGINEERING | IF: 9.078
WoS CC Cited Count: 2
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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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Green and Sustainable Layered Chitin-Vitrimer Composite with Enhanced Modulus, Reprocessability, and Smart Actuator Function EI SCIE Scopus
期刊论文 | 2020 , 8 (40) , 15168-15178 | ACS SUSTAINABLE CHEMISTRY & ENGINEERING | IF: 8.198
WoS CC Cited Count: 8 SCOPUS Cited Count: 18
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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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Low-velocity impact of density-graded foam-filled square columns SCIE Scopus
期刊论文 | 2020 , 27 (2) , 376-389 | INTERNATIONAL JOURNAL OF CRASHWORTHINESS | IF: 2.055
SCOPUS Cited Count: 5
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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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Mechanics of dielectric elastomer structures: A review EI SCIE Scopus
期刊论文 | 2020 , 38 | Extreme Mechanics Letters | IF: 4.567
WoS CC Cited Count: 36 SCOPUS Cited Count: 129
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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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Hydrogel 3D printing with the capacitor edge effect EI SCIE PubMed
期刊论文 | 2019 , 5 (3) | SCIENCE ADVANCES | IF: 13.116
WoS CC Cited Count: 35
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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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