Model of resonance mechanical loss that considers bias field and pre-stress in magnetostricitve/piezoelectric sandwich laminate

• The nonlinear mechanical loss model considering bias field and pre-stress is built.
• The influence of stress on fr, fa and mechanical loss can be predicted.
• Mechanical loss is significantly reduced by applying a static magnetic field Hdc• Mechanical loss can be significantly reduced by applying compressive stress when fr>fr0.

A nonlinear mechanical loss model of magnetoelectric laminated composite that fully considers the static magnetic field and pre-stress is established. The proposed model effectively predicts variations in the resonance frequency, anti-resonance frequency, and mechanical loss of magnetostricitve/piezoelectric sandwich laminate as functions of the magnetic field and pre-stress. The degradation model can effectively predict experimental results, confirming the model’s validity, when the pre-stress is taken as 0 MPa. By this model, it is found that the mechanical loss can be significantly reduced by applying a static magnetic field less than the critical resonance magnetic field when the resonance frequency is less than the resonance frequency corresponding to no magnetic field; also, when the resonance frequency is larger than the resonance frequency corresponding to no magnetic field, the mechanical loss can be significantly reduced by applying compressive stress.