Modeling Approaches to Predict Damage Evolution and Life Time of Brittle Ferroelectrics

Ricoeur, Andreas; Lange, Stephan; Gellmann, Roman

doi:10.1007/978-3-319-21467-2_11

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2016

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“…where the relation for the strain is well-known [24] and the generalization for the electric field is straightforward [25]. In equations (35) and (36) A is the area of the RVE and a the half of the current length of the microcrack with n i being its unit normal.…”

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confidence: 99%

Continuum damage model for ferroelectric materials and its application to multilayer actuators

Gellmann

Ricoeur

2016

Smart Mater. Struct.

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In this paper a micromechanical continuum damage model for ferroelectric materials is presented. As a constitutive law it is implemented into a finite element (FE) code. The model is based on micromechanical considerations of domain switching and its interaction with microcrack growth and coalescence. A FE analysis of a multilayer actuator is performed, showing the initiation of damage zones at the electrode tips during the poling process. Further, the influence of mechanical pre-stressing on damage evolution and actuating properties is investigated. The results provided in this work give useful information on the damage of advanced piezoelectric devices and their optimization.

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confidence: 99%