Abstract In this research, a fully-coupled finite element-based Multiphysics computational study was used to investigate a multiferroic composite structure comprised of a Terfenol-D magnetostrictive cylinder and a lead zirconate titanate (PZT) piezoelectric cylinder in a concentric bilayer configuration. The modeling parameters were carefully selected to address fundamental limitations in previous modeling efforts and accurately capture complex physical phenomena, including magnetic shielding, nonuniform magnetization, and principal strains. The composite structure was subjected to simultaneous stimuli of an AC electric field to actuate the outer PZT cylinder and a bias static magnetic field to activate the inner Terfenol-D cylinder. Composite geometry, configuration, and loading parameters were selected following prior experimental studies to simulate realistic operating conditions of the multiferroic structure, where the latter was used to validate the results of the computational model. The electric, magnetic, and mechanical responses of the multiferroic composite structure were vigorously investigated using the resulting three-dimensional full-field solution. It was found to be well-ordered with previous results, demonstrating the utility of the computational framework in exploiting the performance of the 1-3 multiferroic composite structures. To further elucidate the validity of the results, the experimental results from noncontact spatiotemporal laser vibrometer measurements, collected from a physical composite structure with analogous dimensions, were benchmarked with the simulation results. In all, the overall response of the model was validated with experimental displacement and strain measurements which were found to be in close agreement.

中文翻译：

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1-3多铁性复合结构动力响应的全耦合计算建模

摘要 在本研究中，基于全耦合有限元的多物理场计算研究用于研究由 Terfenol-D 磁致伸缩圆柱体和锆钛酸铅 (PZT) 压电圆柱体组成的同心双层结构的多铁性复合结构。建模参数经过精心选择，以解决先前建模工作中的基本限制，并准确捕获复杂的物理现象，包括磁屏蔽、非均匀磁化和主应变。该复合结构同时受到交流电场刺激以驱动外部 PZT 圆柱体和偏置静磁场以激活内部 Terfenol-D 圆柱体。复合几何、配置、根据先前的实验研究选择和加载参数来模拟多铁性结构的实际操作条件，其中后者用于验证计算模型的结果。使用所得的三维全场解决方案，对多铁性复合结构的电、磁和机械响应进行了深入研究。发现它与之前的结果是有序的，证明了计算框架在利用 1-3 多铁性复合结构的性能方面的效用。为了进一步阐明结果的有效性，将从具有类似尺寸的物理复合结构收集的非接触式时空激光测振仪测量的实验结果与模拟结果进行基准测试。在所有，