engleski

Piezoelectric beam element with embedded discontinuity

Most of the piezoelectric materials are quasi- brittle and subjected to mechanical and electrical loading, which can lead to mechanical damage or dielectric breakdown. If mechanical damage or dielectric breakdown occurs in an active part of a “smart” device, it can lead to the malfunction of the entire device. A reliable numerical model for predicting the damage behavior of piezoelectric materials can facilitate the prediction and extension of the service periods and the work life of “smart” devices. One type of numerical models for the description of damage in brittle materials are lattice models [1], where continuum is represented by solid particles interacting by cohesive forces, represented in the model by one-dimensional finite elements. The softening of the lattice elements will cause the damage propagation through the material. This can be described objectively by introducing the displacement discontinuity at the integration points of the elements. In this work a piezoelectric beam finite element with embedded discontinuity is presented, which could be suitable for the use in lattice models for the description of damage in piezoelectric materials.

piezoelectric materials, beam finite element, embedded discontinuity, polarization

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