An explicit full-field expression of the Green's functions for anisotropic piezoeleetric bimateri- als with a slipping interface is derived.When the electro-elastic singularity reduces to a pray dislocation in dis...An explicit full-field expression of the Green's functions for anisotropic piezoeleetric bimateri- als with a slipping interface is derived.When the electro-elastic singularity reduces to a pray dislocation in displacement and electric potential,interaction energy,between the dislocation and the bimaterials is obtained explicitly while the generalized force on the disloeation is given in a real form whieh is also valid for degener- ate materials.The investigation demonstrates that the houndary conditions at lhe slipping interface between two piezoelectric materials will exert a prominent influence on the mobility of the dislocation.展开更多
We describe simulations of lubrication by a hexadecane molecular lubricating film during the shearing process of a Cu-Zn alloy performed using the atomistic method.The results indicate that with increasing Zn contents...We describe simulations of lubrication by a hexadecane molecular lubricating film during the shearing process of a Cu-Zn alloy performed using the atomistic method.The results indicate that with increasing Zn contents,the interface slip between the alloy wall and the lubricating film first decreases and then increases,according to variations of the radius distribution function(RDF),while the interface slip reaches its lowest value of 0.12 during the shearing of CuZn30 alloy.We also discuss the relationship between interface roughness and the lubricating film.During film lubrication,the interface's roughness effectively inhibits interfacial slip.For the convex contact model,the presence of the hexadecane lubricating film reduces the interfacial contact pressure from 11.9 GPa to 8.7 GPa and the friction coefficient from 0.81 to 0.52.展开更多
In this paper, a general model on sound reflection from a layered solid medium with rigid and slip interfaces is proposed by using matrix method. Analytical expressions for reflection coefficients of both longitudinal...In this paper, a general model on sound reflection from a layered solid medium with rigid and slip interfaces is proposed by using matrix method. Analytical expressions for reflection coefficients of both longitudinal and transverse waves from the layered solid medium with one or two slip interfaces are derived. Numerical results of sound reflection coefficients from some typical adhesive joints with slip and rigid interfaces are presented, which may be useful for correct choice of technical parameters in ultrasonic evaluation of their interface properties.展开更多
基金the National Natural Science Foundation of China (No.59635140)
文摘An explicit full-field expression of the Green's functions for anisotropic piezoeleetric bimateri- als with a slipping interface is derived.When the electro-elastic singularity reduces to a pray dislocation in displacement and electric potential,interaction energy,between the dislocation and the bimaterials is obtained explicitly while the generalized force on the disloeation is given in a real form whieh is also valid for degener- ate materials.The investigation demonstrates that the houndary conditions at lhe slipping interface between two piezoelectric materials will exert a prominent influence on the mobility of the dislocation.
基金Project supported by the Natural Science Foundation of Jiangsu Higher Education Institutions(Grant No.17KJA460002)the“Six Talent Peaks”of Jiangsu Province,China(Grant No.GDZB-002).
文摘We describe simulations of lubrication by a hexadecane molecular lubricating film during the shearing process of a Cu-Zn alloy performed using the atomistic method.The results indicate that with increasing Zn contents,the interface slip between the alloy wall and the lubricating film first decreases and then increases,according to variations of the radius distribution function(RDF),while the interface slip reaches its lowest value of 0.12 during the shearing of CuZn30 alloy.We also discuss the relationship between interface roughness and the lubricating film.During film lubrication,the interface's roughness effectively inhibits interfacial slip.For the convex contact model,the presence of the hexadecane lubricating film reduces the interfacial contact pressure from 11.9 GPa to 8.7 GPa and the friction coefficient from 0.81 to 0.52.
文摘In this paper, a general model on sound reflection from a layered solid medium with rigid and slip interfaces is proposed by using matrix method. Analytical expressions for reflection coefficients of both longitudinal and transverse waves from the layered solid medium with one or two slip interfaces are derived. Numerical results of sound reflection coefficients from some typical adhesive joints with slip and rigid interfaces are presented, which may be useful for correct choice of technical parameters in ultrasonic evaluation of their interface properties.
