Friction plays a pivotal role in the sliding-mode triboelectric energy harvester(TEH),which not only enables the charge transfer between two dielectrics,but also influences the energy harvesting performance by affecti...Friction plays a pivotal role in the sliding-mode triboelectric energy harvester(TEH),which not only enables the charge transfer between two dielectrics,but also influences the energy harvesting performance by affecting the dynamic response of the TEH.How to evaluate the effects of the friction on TEHs is important for optimizing TEHs in engineering practices.In order to analyze the effects of the friction on the dynamic response and evaluate the energy harvesting performance ofTEHs,the paper models the friction of a devised non-linear TEH based on the Coulomb friction model and the Macro-slip friction theory.The TEH equips a pair of magnets,rendering a switching between the bistability and the monostability by tuning the distance between two magnets.The dynamic model of the non-linear TEH is established by the extended Hamilton principle.The effects of friction in slidingmode TEH are dissected in detail.The influences of parameters on both the mechanical and electrical responses are also systemically studied to explore an optimal energy harvesting performance in the low-frequency range.This work provides a guideline for designing and accurately analyzing a sliding-mode TEH.展开更多
A macro slip theory is presented in this paper.Four independent slip systems are proposed for polycrystalline solids.Each slip system consists of a slip plane which lies on a face of the octahedron in stress space and...A macro slip theory is presented in this paper.Four independent slip systems are proposed for polycrystalline solids.Each slip system consists of a slip plane which lies on a face of the octahedron in stress space and a slip direction which is coincident with shear stress acting on the same face of the octahedron.It is proved that for proportional loading,present results are identical with the classical flow theory of plasticity. For nonproportional loading,the macro slip theory shows good predicting ability.The calculated results are in good agreement with the experimental data.展开更多
基金the National Natural Science Foundation of China(Grant Nos.11972152,12002122,and 12122206)Natural Science Foundation of Hunan Province(Grant Nos.2021JJ40092,and 2020JJ4208)Natural Science Foundation of Chongqing and China Postdoctoral Science Foundation(Grant No.2020M672476).
文摘Friction plays a pivotal role in the sliding-mode triboelectric energy harvester(TEH),which not only enables the charge transfer between two dielectrics,but also influences the energy harvesting performance by affecting the dynamic response of the TEH.How to evaluate the effects of the friction on TEHs is important for optimizing TEHs in engineering practices.In order to analyze the effects of the friction on the dynamic response and evaluate the energy harvesting performance ofTEHs,the paper models the friction of a devised non-linear TEH based on the Coulomb friction model and the Macro-slip friction theory.The TEH equips a pair of magnets,rendering a switching between the bistability and the monostability by tuning the distance between two magnets.The dynamic model of the non-linear TEH is established by the extended Hamilton principle.The effects of friction in slidingmode TEH are dissected in detail.The influences of parameters on both the mechanical and electrical responses are also systemically studied to explore an optimal energy harvesting performance in the low-frequency range.This work provides a guideline for designing and accurately analyzing a sliding-mode TEH.
基金The project supported by Chinese Academy of Sciences
文摘A macro slip theory is presented in this paper.Four independent slip systems are proposed for polycrystalline solids.Each slip system consists of a slip plane which lies on a face of the octahedron in stress space and a slip direction which is coincident with shear stress acting on the same face of the octahedron.It is proved that for proportional loading,present results are identical with the classical flow theory of plasticity. For nonproportional loading,the macro slip theory shows good predicting ability.The calculated results are in good agreement with the experimental data.
