层状磁电复合材料界面裂纹的动态断裂

项目名称： 层状磁电复合材料界面裂纹的动态断裂

项目编号： No.11272222

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 刘金喜

作者单位： 石家庄铁道大学

项目金额： 88万元

中文摘要： 由压电层和压磁层复合而成的层状磁电材料，具有磁电转换效率高和易于制作等优点，在传感、换能和声波领域呈现出广泛的应用前景。这类材料磁电效应的转换和相关器件功能的实现与动态载荷密切相关，且其界面易于开裂和失效。因此，本项目拟采用理论分析、数值模拟和实验相结合的方法，研究平面变形下层状磁电复合材料界面裂纹的动态断裂问题，主要内容包括：界面裂纹尖端场的奇异性；界面裂纹与电弹波和磁弹波的相互作用；冲击载荷作用下界面裂纹的瞬态响应和动态扩展。主要目的是获得材料性能、电磁边界条件、几何尺寸和载荷类型对动态断裂特性的影响，揭示动态断裂机理，为层状磁电复合材料的设计和可靠性分析提供理论基础，并丰富多场耦合材料断裂力学的研究内容。

中文关键词： 压电材料；压磁材料；层状磁电结构；动态断裂；弹性波传播

英文摘要： The layered magnetoelectric (ME) composites consist of piezoelectric layers alternating with piezomagnetic layers. Such composites are easily manufactured and possess superior ME coupling effect, which attract their potential applications in sensors, transducers and acoustic wave devices,and so on. When subjected to dynamic mechanical and electromagnetic loads the ME layered materials easily fail. Therefore it is important that the dynamic fracture of interfacial cracks in ME layered materials be analyzed. Using theoretical, numerical and experimental methods, the dynamic fracture of interfacial cracks in ME layered media under plane deformations will studied in this project. The main contents are as follows：（a） the singular behaviors of the magneto-electro-elastic fields in crack tips; (b) the scattering of electro-elastic and magneto-elastic waves by an interfacial crack; (c) the transient response and dynamic propagation of an interfacial crack under impacts. The objective of this project is to reveal the effects of material properties, electromagnetic boundary conditions on crack surfaces, geometric sizes and load types on dynamic fracture behaviors. The completion of this project will give a better understanding of the dynamic fracture of interfacial cracks and provide a theoretical basis for reliable servi

英文关键词： Pizeoelectric material；Piezomagnetic material；Layered magnetoelectric structure；Dynamic fracture；Elastic wave propagation