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学者姓名：杨鹏飞
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Abstract ：
In this work, a novel snap-through mechanism of a thin beam confined in a curved constraint and driven by local loading curvature is investigated. The movable boundaries of the buckled thin beam enable it to output snap-through rotation at a lower energy input than the double-clamped beam structure. A theory is proposed to reveal the snap-through mechanism of the proposed structure based on the principle of minimum potential energy and saddle-node bifurcation, which uncovers the influences of loading positions, length ratio and constraint radius on the critical loading. Both theoretical and experimental results show that the large loading position and small constraint radius correspond to a large critical loading, while the length ratio hardly affects the critical loading. In addition, an experimental device is designed to output linear displacement based on the proposed snap-through mechanism. Due to lower energy input and snap-through response characteristics, the proposed bistable mechanism exhibits great prospects in energy harvesters, actuators, motors, pumps and robots. © 2024 Elsevier Ltd
Keyword ：
Buckling loads Buckling loads Buckling modes Buckling modes Local buckling Local buckling
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| GB/T 7714 | Yang, Pengfei , Li, Xuefeng , Xin, Shiwei et al. Snap-through mechanism of a thin beam confined in a curved constraint [J]. | Thin-Walled Structures , 2025 , 207 . |
| MLA | Yang, Pengfei et al. "Snap-through mechanism of a thin beam confined in a curved constraint" . | Thin-Walled Structures 207 (2025) . |
| APA | Yang, Pengfei , Li, Xuefeng , Xin, Shiwei , Mao, Yuqing , Gao, Luyu , Dang, Fei . Snap-through mechanism of a thin beam confined in a curved constraint . | Thin-Walled Structures , 2025 , 207 . |
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Smart materials responsive to stimuli and new rotary mechanisms have drawn much attention in recent years. This paper investigates a novel snap-through rotation mechanism of a thermal responsive bimetal ring confined inside the annular region constraint when subjected to the local curvature induced by thermal loading. The buckled ring has movable boundaries and keeps an invariant shape during the snap-through rotation so that it requires small energy input to drive the bistable transition. To uncover the elusive mechanism behind this intriguing snap-through phenomenon, a theory based on the bifurcation and energy principle is developed to predict the critical loading curvature and the critical loading temperature, which agrees with the experimental results. The effects of loading positions and the constraint width are studied and a map predicting the critical loading curvature with different geometrical parameters is demonstrated. The rotary buckled ring not only enables the bistable actuation, but also triggers various actuation applications such as the motor actuation and the pump actuation. Due to great advantages in terms of energy supply and actuation loading, this study exhibits great potential of the proposed snap-through mechanism in bistable structures and rotary actuation.
Keyword ：
Bistable structure Bistable structure Buckling Buckling Finite element method simulation Finite element method simulation Functional variation Functional variation Rotary actuation Rotary actuation
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| GB/T 7714 | Yang, Pengfei , Liu, Hong , Li, Xuefeng et al. Snap-through mechanism of an elastic bimetal ring for rotary actuation [J]. | COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION , 2025 , 140 . |
| MLA | Yang, Pengfei et al. "Snap-through mechanism of an elastic bimetal ring for rotary actuation" . | COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION 140 (2025) . |
| APA | Yang, Pengfei , Liu, Hong , Li, Xuefeng , Xin, Shiwei , Dang, Fei . Snap-through mechanism of an elastic bimetal ring for rotary actuation . | COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION , 2025 , 140 . |
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Previous rolling soft robots have difficulty in balancing the locomotion speed with energy efficiency and have limited terrain adaptability. This work proposes a rolling soft robot driven by local snap-through buckling, which employs the fast response and configuration maintenance of the bistable structure to enhance the locomotion performance of the soft robot. A theory based on bifurcation and the energy principle is established to analyze the rolling mechanism. The influences of loading position and geometric parameters on the rolling performance are investigated and verified experimentally. The soft robot shows good locomotion speed (0.95 body length per second, BL/s) and small energy loss due to the almost unchanged configuration during the rolling process. The soft robot adapts to complex terrains, including a step with the height of 15 mm, a slope with the angle of 18.36 degrees, and a broken bridge with the gap length of 90 mm (0.443 BL). The proposed rolling soft robot not only has good application prospects in land exploration missions and medical applications but also provides inspiration for the development of rolling soft robots.
Keyword ：
bistable bistable pneumatic actuation pneumatic actuation rolling mechanism rolling mechanism soft robot soft robot
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| GB/T 7714 | Yang, Pengfei , Mao, Yuqing , Liu, Hong et al. A Rolling Soft Robot Driven by Local Snap-Through Buckling [J]. | SOFT ROBOTICS , 2024 . |
| MLA | Yang, Pengfei et al. "A Rolling Soft Robot Driven by Local Snap-Through Buckling" . | SOFT ROBOTICS (2024) . |
| APA | Yang, Pengfei , Mao, Yuqing , Liu, Hong , Gao, Luyu , Huang, Feng , Dang, Fei . A Rolling Soft Robot Driven by Local Snap-Through Buckling . | SOFT ROBOTICS , 2024 . |
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Tai chi culture has a widespread influence on the world. Tai-chi diagrams, as the symbol of Tai chi culture, express the balance between Yin and Yang through the centrosymmetric pattern, but the balance connotation of Tai-chi diagrams needs a comprehensive understanding in more aspects, e.g., the balance in mechanics. In this work, we propose a mechanics theory to investigate the intrinsic mechanism of Yin-Yang equilibrium in ancient and modern Tai-chi diagrams. The model based on the minimum potential energy theory can effectively describe the interface curves of the Yin-Yang equilibrium by modifying boundary conditions, which is proven by experiments. The results show that the balance of Tai-chi diagrams is not only manifested in its symmetrical appearance but also reflected in its intrinsic balance configuration in mechanics. The model presented herein provides a new perspective to understand the balance of Tai-chi diagrams, which may provide useful insights into the applications of Tai-chi diagrams. © 2024 Author(s).
Keyword ：
Graphic methods Graphic methods Potential energy Potential energy
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| GB/T 7714 | Dang, Fei , Xiao, Qingquan , Yang, Pengfei . Mechanics equilibrium in Tai-chi diagram [J]. | AIP Advances , 2024 , 14 (7) . |
| MLA | Dang, Fei et al. "Mechanics equilibrium in Tai-chi diagram" . | AIP Advances 14 . 7 (2024) . |
| APA | Dang, Fei , Xiao, Qingquan , Yang, Pengfei . Mechanics equilibrium in Tai-chi diagram . | AIP Advances , 2024 , 14 (7) . |
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Force measurement is crucial in numerous engineering applications, while traditional force sensors often face problems such as elevated expenses or significant measurement errors. To tackle this issue, we propose an innovative force sensor employing three nested flexible rings fabricated through 3D additive manufacturing, which detects external forces through the displacement variations of flexible rings. An analytical model on the basis of the minimal energy method is developed to elucidate the force-displacement correlation with nonlinearity. Both FEM simulations and experiments verify the sensor’s effectiveness. This sensor has the advantages of low expenses and easy manufacture, indicating promising prospects in a range of applications, including robotics, the automotive industry, and iatrical equipment. © 2024 by the authors.
Keyword ：
3D-printed force sensor 3D-printed force sensor force-displacement relationship force-displacement relationship nested rings nested rings nonlinear analytical model nonlinear analytical model
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| GB/T 7714 | Yang, P. , Xin, S. , Mao, Y. et al. Design and Validation of Single-Axis 3D-Printed Force Sensor Based on Three Nested Flexible Rings [J]. | Sensors , 2024 , 24 (16) . |
| MLA | Yang, P. et al. "Design and Validation of Single-Axis 3D-Printed Force Sensor Based on Three Nested Flexible Rings" . | Sensors 24 . 16 (2024) . |
| APA | Yang, P. , Xin, S. , Mao, Y. , Dang, F. , Huang, F. . Design and Validation of Single-Axis 3D-Printed Force Sensor Based on Three Nested Flexible Rings . | Sensors , 2024 , 24 (16) . |
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Abstract ：
In this study, graphene/polypyrrole (RGO/PPy) electrodes with porous structures were prepared by electrochemical codeposition and reduction. The porous structure not only enhances the effective contact area of the electrodes but also actively promotes the diffusion efficiency of the electrolyte ions. As a result, a maximum capacitance of 1091.2 mF·cm-2 at 1 mA·cm-2 is achieved for the 0.2-RGO/PPy electrode prepared using the deposition solution containing 0.2 mg·mL-1 of GO. The 0.2-RGO/PPy maintains a capacitance of 78.4% at 10 mA·cm-2. In particular, the 0.2-RGO/PPy-based supercapacitor exhibits a stack capacitance of up to 28.3 F·cm-3. Furthermore, the supercapacitor exhibits excellent mechanical flexibility with a 93.3% capacitance retention, even under 180° bending. This study demonstrates the significant potential of RGO/PPy electrodes for high-performance energy storage systems. © 2024 American Chemical Society.
Keyword ：
electrodeposition electrodeposition flexible supercapacitor flexible supercapacitor high areal capacitance high areal capacitance porous structure porous structure RGO/PPy composite RGO/PPy composite
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| GB/T 7714 | Dang, F. , Cai, Y. , Yang, P. . Electrodeposition of Graphene/Polypyrrole Electrode for Flexible Supercapacitor with Large Areal Capacitance [J]. | ACS Applied Energy Materials , 2024 , 7 (14) : 5832-5838 . |
| MLA | Dang, F. et al. "Electrodeposition of Graphene/Polypyrrole Electrode for Flexible Supercapacitor with Large Areal Capacitance" . | ACS Applied Energy Materials 7 . 14 (2024) : 5832-5838 . |
| APA | Dang, F. , Cai, Y. , Yang, P. . Electrodeposition of Graphene/Polypyrrole Electrode for Flexible Supercapacitor with Large Areal Capacitance . | ACS Applied Energy Materials , 2024 , 7 (14) , 5832-5838 . |
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Snap-through bistability was widely exploited for rapid hopping in micro-electro-mechanical systems and soft robots. However, considerable energy input was required to trigger the transition between discrete buckling states blocked by potential wells. Here a dynamic buckling mechanism of a buckled blister constrained inside an outer ring is explored for eliciting rotary actuation via a localized change of curvature in the blister. Due to rotational invariance of the buckled blister, lower energy supply is required to initiate the snap-through of buckling compared to conventional bistable mechanism. The controllability in rotational speed and output torque of the bimetallic blister-based rotator inside a rigid stator is exhibited, and the locomotion is demonstrated with two elastic rings via localized pneumatic actuators. With broad choices of stimulus and material for rings, the findings illustrate the promising potential of two nested rings to create active motions for diverse applications including gearless motors, peristaltic pumps, and locomotive robots. © 2024 The Authors. Exploration published by Henan University and John Wiley & Sons Australia, Ltd.
Keyword ：
buckling buckling rotary actuation rotary actuation rotary mechanism rotary mechanism snap-through bistability snap-through bistability
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| GB/T 7714 | Yang, P. , Huang, R. , Dang, F. et al. Motorizing the buckled blister for rotary actuation [J]. | Exploration , 2024 , 4 (5) . |
| MLA | Yang, P. et al. "Motorizing the buckled blister for rotary actuation" . | Exploration 4 . 5 (2024) . |
| APA | Yang, P. , Huang, R. , Dang, F. , Shan, B. , Wang, D. , Liu, H. et al. Motorizing the buckled blister for rotary actuation . | Exploration , 2024 , 4 (5) . |
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Force measurement is indispensable in vast engineering applications but conventional force sensors usually encounter large measurement errors or high costs. To address this problem, we develop a force sensor based on a 3D-printed elastic ring structure, which measures the external force by utilizing the displacement variation of the elastic ring. The nonlinear theory based on the minimum potential energy principle is proposed to describe the nonlinear relationship between the external force and the ring top displacement. The feasibility of the proposed force sensor scheme is validated through FEM simulations and experiments. The range of the force sensor can be adjusted by tuning the geometric parameters and the material parameters of the elastic ring, while the force sensor shows good measurement error at different measurement ranges. This force sensor possesses simple fabrication and low cost, showing good potential for various applications such as industrial automation, mechanical testing, and medical devices. © 2024 Elsevier Ltd
Keyword ：
3D-printing 3D-printing Displacement variation Displacement variation Elastic ring Elastic ring Force sensor Force sensor Nonlinear theory Nonlinear theory
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| GB/T 7714 | Yang, P. , Xin, S. , Dang, F. . A single-axis force sensor based on a 3D-printed elastic ring [J]. | Measurement: Journal of the International Measurement Confederation , 2024 , 236 . |
| MLA | Yang, P. et al. "A single-axis force sensor based on a 3D-printed elastic ring" . | Measurement: Journal of the International Measurement Confederation 236 (2024) . |
| APA | Yang, P. , Xin, S. , Dang, F. . A single-axis force sensor based on a 3D-printed elastic ring . | Measurement: Journal of the International Measurement Confederation , 2024 , 236 . |
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This paper studies the spontaneous buckling morphology transition of an elastic ring confined in an annular region constraint. With the increase of uniform axial strain, the ring initially forms a symmetrical blister, and then the blister is compressed, spontaneously inclines and transits to the "S" shape. A theoretical framework based on the minimum potential energy theory is proposed to obtain the critical strain of morphology transition, which matches well with experimental results. The map predicting stable buckling shapes of the ring with different geometrical parameters is demonstrated, which may offer helpful guidance to practical applications, for example, the design of gear-less pump and rotary actuators.
Keyword ：
Annular region constraint Annular region constraint Elasticity Elasticity Morphology transition Morphology transition Post -buckling Post -buckling
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| GB/T 7714 | Yanga, Pengfei , Wang, Dewen , Liu, Hong et al. Spontaneous buckling morphology transition of an elastic ring confined in an annular region constraint [J]. | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS , 2023 , 100 . |
| MLA | Yanga, Pengfei et al. "Spontaneous buckling morphology transition of an elastic ring confined in an annular region constraint" . | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS 100 (2023) . |
| APA | Yanga, Pengfei , Wang, Dewen , Liu, Hong , Huang, Ruixing , Li, Xuefeng , Xin, Shiwei et al. Spontaneous buckling morphology transition of an elastic ring confined in an annular region constraint . | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS , 2023 , 100 . |
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The stretchable supercapacitors based on predesigned structures show low specific areal capacitance and lack programmable stretchability. To overcome the limitations, developing a programmable supercapacitor with customizable stretchability and ultrahigh areal capacitance is extremely desirable. In this study, we develop programmable supercapacitors with desirable stretchability and ultrahigh specific capacitance using inter-connected polypyrrole/graphene (PPy/RGO) electrodes. Thanks to the easy accessibility of ions and high ability of ion transfer, the optimized PPy/RGO-1800 electrode achieves a specific capacitance of 1545.6 mF & BULL;cm  2, and the assembled flexible supercapacitor presents an ultrahigh stack capacitance of 45.1 F & BULL;cm  3. The stretchable supercapacitor edited by kirigami delivers a specific capacitance of 489.1 mF & BULL;cm  2 at 400% strain and keeps stable capacitive performance under various deformations (bending, stretching and torsion), which is superior to most of the reported stretchable supercapacitors. Additionally, it can keep more than 92% of initial capacitance after 1000 cycles of various large deformations. The enhanced areal capacitance and easy programmability make the stretchable supercapacitor highly promising for wearable electronics.
Keyword ：
Flexible electrode Flexible electrode graphene graphene Polypyrrole Polypyrrole Programmable supercapacitor Programmable supercapacitor Specific areal capacitance Specific areal capacitance
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| GB/T 7714 | Dang, Fei , Zhao, Wei , Tong, Wenhao et al. Extrinsic design of high-performance programmable supercapacitor with large specific areal capacitance [J]. | ELECTROCHIMICA ACTA , 2023 , 463 . |
| MLA | Dang, Fei et al. "Extrinsic design of high-performance programmable supercapacitor with large specific areal capacitance" . | ELECTROCHIMICA ACTA 463 (2023) . |
| APA | Dang, Fei , Zhao, Wei , Tong, Wenhao , Yang, Pengfei , Wang, Dewen , Liu, Yilun . Extrinsic design of high-performance programmable supercapacitor with large specific areal capacitance . | ELECTROCHIMICA ACTA , 2023 , 463 . |
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