Bending Analysis of Multiferroic Semiconductor Composite Beam towards Smart Cement-Based Materials

Abstract

A beam-like structure of antisymmetric laminated multiferroic piezoelectric semiconductor (LMPS), which consists of two piezomagnetic (PM) and two piezoelectric semiconductor (PS) layers is proposed. The structure could be in pure flexure deformation under an applied magnetic field. Through this deformation mode and the induced polarization field through the magneto-electro-semiconductive (MES) coupling mechanism, the semiconducting properties of PS layers can be manipulated by the applied magnetic field. In order to better understand and quantitatively describe this deformation mode, the one-dimensional governing equations for the LMPS beam are developed based on the three-dimensional theory. The analytical solutions are then presented for the LMPS cantilever beam with open-circuit conditions. The multi-field coupling responses of the LMPS cantilever beam under the longitudinal magnetic field are investigated. Numerical results show that the amplitude of each physical quantity is proportional to the applied magnetic field, and the thickness ratio of the PS phase plays a significant role in the MES coupling behaviors of the LMPS beam. The proposed structure can be integrated into cement structures but also fabricated cement-based multiferroic PS composite materials and structures. It provides an important material and structure basis for developing structural health monitoring systems in the fields of civil and transportation infrastructures.

Theoretical Analysis of Piezoelectric Semiconductor Thick Plates with Periodic Boundary Conditions

“…In spite of this, there are classic electromechanical coupling problems that have been solved for thin plates [30][31][32], or infinite or semi-infinite domains, such as those for fracture [33][34][35] and wave propagation [36][37][38]. In addition, the studies on the temperature effects of PSCs [39][40][41] and the combinations with other functional materials [42,43] also enrich the understanding of the multi-field coupling effects of structures. However, general solutions for finite-sized geometric shapes with complex boundary conditions can provide muchneeded insight for designing PSC devices and sensors [44,45].…”