Abstract
In this paper, the fracture behavior of GaN piezoelectric semiconductor ceramics was investigated under combined mechanical and electric loading by using three-point bending tests and numerical analysis. The experimental results demonstrate that, in contrast to traditional insulating piezoelectric ceramics, electric current is a key factor in affecting the fracture characteristics of GaN ceramics. The stress, electric displacement, and electric current intensity factors were numerically calculated and then a set of empirical formulae was obtained. By fitting the experimental data, a fracture criterion under combined mechanical and electrical loading was obtained in the form of an ellipsoid function of intensity factors. Such a fracture criterion can be extended to predict the failure behavior of other piezoelectric semiconductors or devices with a crack, which are useful in their reliability design and applications.
Highlights
Piezoelectric semiconductor ceramics (PSCs) are semiconducting ceramic materials that have piezoelectric properties [1,2,3]
It is seen that the critical stress intensity factor fracture toughness increases by 36.8%. 1/2
PSCs under combined mechanical, andloading current was by using a three-point bending experiment method
Summary
Piezoelectric semiconductor ceramics (PSCs) are semiconducting ceramic materials that have piezoelectric properties [1,2,3]. In applications, PSC devices are usually subjected to a multi-physics field such as mechanical, electrical and thermal loads. Considered a semi-infinite crack and found out that there are certain differences in fracture behavior of PSC from insulating piezoelectric materials, and obtained an analytical solution for both stress and electric fields near a crack. According to the finite element and boundary element methods, Fan et al [19] and [19] and Zhang et al [20] proposed a piezoelectric-conductor iterative approach for structural. Zhang et al [20] proposed a piezoelectric-conductor iterative approach for structural analysis of PSC analysis of PSC with combined mechanical and electrical loading.
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