Simulation of damage in ferroelectric actuators by means of cohesive zone model
Simulation of damage in ferroelectric actuators by means of cohesive zone model
复制标题
DOI：
10.1016/j.sna.2015.06.030
复制
发表时间：
2015-09
影响因子：
4.6
通讯作者：
S. Kozinov;M. Kuna
中科院分区：
文献类型：
--
作者：
S. Kozinov;M. Kuna
智能结构，特别是铁电多层致动器（MLA）的可靠性基本上降低了累积的损伤和裂纹的形成。在目前的研究中，这种破坏过程是通过有限元法（FEM）采用机电耦合分析进行数值模拟的。首先对驱动器制造过程中的极化过程进行了仿真。接下来，施加具有恒定幅度的交流电压以模拟使用条件。为了对块体材料进行建模，将铁电用户元件实现到商业软件ABAQUS ®中，从而允许模拟畴切换过程。材料损伤被认为是通过循环内聚力模型（CCZM）。牵引分离定律（TSL）解释了机电相互作用。有人发现，致动器的极化过程可能会导致裂纹萌生在电极表面，这是进一步驱动的循环电负载。由于电极尖端附近的机械和电场集中，观察到损伤累积。据我们所知，这是第一个耦合铁电模型结合逐步损伤积累的智能结构，这是一个重要的一步，对未来的致动器设计的优化。
The reliability of smart structures and in particular of ferroelectric multilayer actuators (MLA) is essentially reduced by accumulation of damage and crack formation. Such failure processes are numerically simulated in the current research by finite element method (FEM) employing coupled electro-mechanical analyses. At first, the poling process during manufacturing of the actuator is simulated. Next, an alternating electric voltage with a constant amplitude is applied to mimic in-service conditions. In order to model the bulk material, ferroelectric user elements are implemented into the commercial software ABAQUS©, thus allowing to simulate domain switching processes. Material damage is considered by means of a cyclic cohesive zone model (CCZM). The traction-separation law (TSL) accounts for electro-mechanical interaction. It was found that the poling process of the actuator may induce crack initiation at an electrode surface, which is driven further by the cyclic electric loading. Damage accumulation is observed due to mechanical and electrical field concentrations near the electrode tip. To the best of our knowledge, it is the first coupled ferroelectromechanical modeling combined with gradual damage accumulation in smart structures which is an important step towards future optimizations of the actuator design.