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tuning of non-uniform switch toughening in ferroelectric composites by an electric field

Acta Mechanica Sinica 2016年第5期32卷 866-880页

作者： Xiaodong Xia Zheng Zhong School of Aerospace Engineering and Applied Mechanics Tongji University

This paper deals with a mode III interfacial crack subject to anti-plane stress and in-plane electric fields. The analysis concentrates on the tuning of fracture toughness from non-uniform ferroelectric-ferroelastic domain switching by an electric field. The electric loading changes the size of the asymmetric switching zone. Employing the weight function method, we obtain the electrically-dependent switch toughening for stationary and quasi-static growing interfacial cracks, respectively. Multi-domain solutions are derived for non-poled and fully-poled ferroelectric composites. Numerical results are presented on the electric field tuning of the critical applied stress intensity factor. The research provides ways to optimize fracture properties of ferroelectric composites by altering the electric field.

关键词： Interfacial crack electric field tuning Domain switching Ferroelectric-ferroelastic Toughening

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Electro-lubrication in Janus transition metal dichalcogenide bilayers

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Friction 2022年第11期10卷 1851-1858页

作者： Hao LI Yufeng GUO Wanlin GUO State Key Laboratory of Mechanics and Control of Mechanical Structures MOE Key Laboratory for Intelligent Nano Materials and DevicesCollege of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China

Lubrication induced by a vertical electric field or bias voltage is typically not applicable to twodimensional(2D)van der Waals(vdW)*** performing extensive first-principles calculations,we reveal that the interlayer friction and shear resistance of Janus transition metal dichalcogenide(TMD)MoXY(X/Y=S,Se,or Te,and X≠Y)bilayers under a constant normal force mode can be reduced by applying vertical electric *** maximum interlayer sliding energy barriers between AA and AB stacking of bilayers MoSTe,MoSeTe,and MoSSe decrease as the positive electric field increases because of the more significant counteracting effect from the electric field energy and the more significant enhancement in interlayer charge transfer in AA ***,the presence of negative electric fields decreases the interlayer friction of bilayer MoSTe,because the electronegativity difference between Te and S atoms reduces the interfacial atom charge differences between AA and AB *** results reveal an electro-lubrication mechanism for the heterogeneous interfaces of 2D Janus TMDs.

关键词： Janus transition metal dichalcogenide(TMD) electro-lubrication electric field tuning first-principles calculations

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