Deformation and Fracture of Electromagnetic Thin Films and Laminates under Multi-field Loading

The deformation and fracture behaviors of magnetoelectric materials under mechanical loading are affected considerably by an external electric or magnetic field. To provide a deep understanding of the intrinsic coupling properties, several macro/micro-nano multi-field instruments have been designed and constructed, including an electro-magneto-mechanical nanoindentation apparatus and a multi-field bulge-test instrument. With these instruments, several new experimental results have been observed, such as multi-field indentation scaling relationship and magnetic field control of 180° ferroelectric domain switching for magnetoelectric laminates. Furthermore, an electro-magneto-mechanical coupling model considering the effects of surface stress and a finite element based real-space phase field model are developed, which provide reference for structure design of magnetoelectric intelligent device at small scale.