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余寿文, Bin Gu, Shou-Wen Yu *, Xi-Qiao Feng *
,-0001,():
-1年11月30日
Using the integral transform and the Cauchy singular integral equation methods, the problem of an interface crack between two dissimilar piezoelectric layers under mechanical impacts is investigated under the permeable electrical boundary condition on the crack surface. The dynamic stress intensity factors (DSIFs) of both mode-I and II are determined. The effects of the crack configuration and the combinations of the constitutive parameters of the piezoelectric materials on the dynamic response are examined. The numerical calculation of the mode-I plane problem indicates that the DSIFs may be retarded or accelerated by specifying different combinations of material parameters. In addition, the parameters of the crack configuration, including the ratio of the crack length to the layer width and the ratio between the widths of two layers, exert a considerable influence on the DSIFs. The results seem useful for design of the piezoelectric structures and devices of high performance.
Dynamic stress intensity factor, Interface crack, Piezoelectric material, Integral transform, Singular integral equation
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【期刊论文】ANTI-PLANE VIBRATION OF RACKED PIEZOELECTRIC MATERIALS
余寿文, Zeng-tao CHEN, and Shou-wen YU
Mechanics Research Communications, Vol. 25, No.3, pp. 321-327. 1998,-0001,():
-1年11月30日
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余寿文, Wang Xuyue, Yu Shouwen
Key Engineering Materials Vols. 251-252 (2003) pp. 215-220,-0001,():
-1年11月30日
The wave function expansion method and singular integral equations are used to investigate the scattering of SH waves by a cylindrical piezoelectric inclusion partially debonded from piezoelectric matrix. For impermeable crack case, dynamic stress intensity factors are obtained and numerical results show the phenomenon of low frequency resonance for various debonding sizes and incident angles.
Scattering of waves, Piezoelectric inclusion, Near fields
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【期刊论文】A triggering criterion of dislocation sourcesunder Mode-Isingular stresses
余寿文, ZHI-XING LU, SHOU-WEN YU and XI-QIAO FENG
International Journal of Fracture 0: 1-6, 2004.,-0001,():
-1年11月30日
A triggering criterion is suggested to determine the instability of a dislocation source under Mode-I singular stresses. Two kinds of configurations are considered, including a crack and a wedge formed by climbing dislocations pileup. Numerical results are given and discussed for both the cases.
Brittle-to-ductile transition, crack, dislocation, wedge
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【期刊论文】Micro-scale adhesive contact of a spherical rigid punch on a piezoelectric half-space
余寿文, Z.R. Chen, S.W. Yu*
,-0001,():
-1年11月30日
The micro-scale adhesive contact behavior of a spherical rigid punch on a piezoelectric half-space is investigated in this paper. The governing equations describing the adhesive contact behavior are obtained by using the Maugis-Dugdale (M-D) elastic adhesive contact theory [J. Colloid Interface Sci. 150 (1992) 243]. The solutions for indentation of piezoelectric materials and for elastic adhesive contact can be reduced from the present results in the absence of adhesion effect and piezoelectric effect, respectively. The effect of the electric load on the adhesive contact behavior is analyzed. It is shown that the piezoelectric effect has a significant effect on the adhesive contact behavior of piezoelectric materials. The obtained results will be helpful to understand the micro-indentation properties of piezoelectric materials.
Adhesion, Micro-contact, Piezoelectric materials, Surface effect, Size effect, couple, indentation
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