Applied Mathematics and Mechanics (English Edition) ›› 2021, Vol. 42 ›› Issue (5): 625-640.doi: https://doi.org/10.1007/s10483-021-2721-5

• Articles • Previous Articles     Next Articles

Surface effects on a mode-III reinforced nano-elliptical hole embedded in one-dimensional hexagonal piezoelectric quasicrystals

Zhina ZHAO1, Junhong GUO1,2   

  1. 1. Department of Mechanics, Inner Mongolia University of Technology, Hohhot 010051, China;
    2. School of Aeronautics, Inner Mongolia University of Technology, Hohhot 010051, China
  • Received:2020-08-16 Revised:2021-01-29 Online:2021-05-01 Published:2021-04-22
  • Contact: Junhong GUO, E-mail:jhguo@imut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China (Nos. 12072166 and 11862021), the Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region (No. NJYT-19-A06), and the Natural Science Foundation of Inner Mongolia Autonomous Region of China (No. 2020MS01006)

Abstract: To effectively reduce the field concentration around a hole or crack, an anti-plane shear problem of a nano-elliptical hole or a nano-crack pasting a reinforcement layer in a one-dimensional (1D) hexagonal piezoelectric quasicrystal (PQC) is investigated subject to remotely mechanical and electrical loadings. The surface effect and dielectric characteristics inside the hole are considered for actuality. By utilizing the technique of conformal mapping and the complex variable method, the phonon stresses, phason stresses, and electric displacements in the matrix and reinforcement layer are exactly derived under both electrically permeable and impermeable boundary conditions. Three size-dependent field intensity factors near the nano-crack tip are further obtained when the nano-elliptical hole is reduced to the nano-crack. Numerical examples are illustrated to show the effects of material properties of the surface layer and reinforced layer, the aspect ratio of the hole, and the thickness of the reinforcing layer on the field concentration of the nano-elliptical hole and the field intensity factors near the nano-crack tip. The results indicate that the properties of the surface layer and reinforcement layer and the electrical boundary conditions have great effects on the field concentration of the nano-hole and nano-crack, which are useful for optimizing and designing the microdevices by PQC nanocomposites in engineering practice.

Key words: surface effect, reinforcement layer, exact solution, piezoelectric quasicrystal (PQC), nano-hole/crack

2010 MSC Number: 

APS Journals | CSTAM Journals | AMS Journals | EMS Journals | ASME Journals