Abstract

Strain-mediated magnetoelectric composites have experienced a recent influx of research and transitional interests since they are hypothesized to hold the potential for further miniaturization of electronic devices while being energy efficient. Regardless of their operational paradigm, i.e., direct or converse, the underlying coupling mechanisms imply the induction of mechanical stresses at different levels based on the boundary conditions, materials properties, and the stacking configuration of the composite structure. In here, the state of stress in a concentric composite cylinder consisting of an inner piezomagnetic and an outer piezoelectric is analytically investigated as a function of several continuity and boundary conditions while operating under the direct coupling paradigm. The interface between the cylinders was considered either to be directly bonded or an elastic layer was inserted between the cylinders to mediate the strain. Mohr-Coulomb failure criterion was then used to detect the failure potential based on the state of stress. Upon failure, the damaged regions due to stresses exceeding the material capacity were treated separately from the original material, where the electrical and magnetic properties were suppressed and the regions were treated as purely elastic. Henceforth, these damaged regions altered the boundary or the continuity conditions resulting in change in the magnetoelectric coupling, where the latter exhibited changes in amplitude and frequency at maximum peak.

摘要

应变介导的磁电复合材料最近经历了研究和过渡兴趣的涌入，因为它们被假设具有使电子设备进一步小型化的潜力，同时具有能源效率。无论它们的操作范式是什么，即直接或相反，潜在的耦合机制都意味着根据边界条件、材料特性和复合结构的堆叠配置在不同级别引入机械应力。在这里，在直接耦合范式下运行时，分析研究了由内部压磁体和外部压电体组成的同心复合圆柱体中的应力状态，作为几个连续性和边界条件的函数。圆柱体之间的界面被认为要么直接粘合，要么在圆柱体之间插入弹性层以调节应变。然后使用 Mohr-Coulomb 失效准则来检测基于应力状态的失效可能性。发生故障时，由于应力超过材料容量而导致的损坏区域与原始材料分开处理，其中电磁特性受到抑制，并且该区域被视为纯弹性。此后，这些受损区域改变了边界或连续性条件，导致磁电耦合发生变化，后者在最大峰值处表现出幅度和频率的变化。然后使用 Mohr-Coulomb 失效准则来检测基于应力状态的失效可能性。发生故障时，由于应力超过材料容量而导致的损坏区域与原始材料分开处理，其中电磁特性受到抑制，并且该区域被视为纯弹性。此后，这些受损区域改变了边界或连续性条件，导致磁电耦合发生变化，后者在最大峰值处表现出幅度和频率的变化。然后使用 Mohr-Coulomb 失效准则来检测基于应力状态的失效可能性。发生故障时，由于应力超过材料容量而导致的损坏区域与原始材料分开处理，其中电磁特性受到抑制，并且该区域被视为纯弹性。此后，这些受损区域改变了边界或连续性条件，导致磁电耦合发生变化，后者在最大峰值处表现出幅度和频率的变化。其中电磁特性被抑制，这些区域被视为纯弹性。此后，这些受损区域改变了边界或连续性条件，导致磁电耦合发生变化，后者在最大峰值处表现出幅度和频率的变化。其中电磁特性被抑制，这些区域被视为纯弹性。此后，这些受损区域改变了边界或连续性条件，导致磁电耦合发生变化，后者在最大峰值处表现出幅度和频率的变化。