微结构对电磁弹性复合材料有效性能的影响
发布时间：2019-06-22 14:02
【摘要】：电磁弹性复合材料在现代科学技术领域有着广泛的应用,随着材料科学的发展,它已成为一种重要的智能材料和结构。有效电磁弹性系数是电磁弹性复合材料的重要参数并受到复合材料微结构的强烈影响,因此预测电磁弹性复合材料有效电磁弹性性能具有重要意义。本文研究具有周期微结构的电磁弹性单向纤维复合材料的有效电弹性性能。以复合材料代表性体积单元为研究对象,通过在代表性体积单元边界上施加满足周期性的位移、电势和磁势边界条件,利用有限元软件Comsol Multiphysics的PDE求解模块,得到了代表性体积单元内的电磁弹性场。由平均的电磁弹性场和有效电磁弹性系数的定义,求解了几类周期电磁弹性复合材料的有效电磁弹性系数。分别预测了方形排列单元模型电磁弹性复合材料的有效电磁弹性系数。通过算例,比较了相同电磁材料体积分数下圆环形截面电磁纤维复合材料与圆截面电磁纤维复合材料有效电磁弹性性能的差异,讨论了压电与压磁纤维互相改变时和涂层的刚性改变时的力学性质对有效电磁弹性系数的影响,对比了3种压电压磁材料不同排列时的有效电磁弹性系数,研究了破坏对电磁弹性复合材料的有效电磁弹性系数的影响。本文结论可为高灵敏度电磁弹性复合材料的设计提供有价值的参考。
[Abstract]:Electromagnetic elastic composites have a wide range of applications in the field of modern science and technology. with the development of material science, it has become an important intelligent material and structure. The effective electromagnetic elastic coefficient is an important parameter of electroelastic composites and is strongly affected by the microstructure of the composites, so it is of great significance to predict the effective electromagnetic elastic properties of electroelastic composites. In this paper, the effective electroelastic properties of electromagnetic elastic unidirectional fiber composites with periodic microstructure are studied. Taking the representative volume element of composite material as the research object, the electromagnetic elastic field in the representative volume element is obtained by applying periodic displacement, potential and magnetic potential boundary conditions on the boundary of the representative volume element, and using the PDE solution module of the finite element software Comsol Multiphysics. Based on the definition of average electromagnetic elastic field and effective electromagnetic elastic coefficient, the effective electromagnetic elastic coefficients of several kinds of periodic electromagnetic elastic composites are solved. The effective electromagnetic elastic coefficients of electromagnetic elastic composites with square arrangement element model are predicted respectively. Through an example, the difference of effective electromagnetic elastic properties between annular section electromagnetic fiber composites and circular cross section electromagnetic fiber composites under the same volume fraction of electromagnetic materials is compared. The effects of mechanical properties on effective electromagnetic elastic coefficients when piezoelectric and piezommagnetic fibers change each other and when the rigidity of the coating changes are discussed. The effective electromagnetic elastic coefficients of three kinds of piezoelectric magnetic materials with different arrangement are compared. The effect of failure on the effective electromagnetic elastic coefficient of electroelastic composites was studied. The conclusion of this paper can provide valuable reference for the design of high sensitivity electromagnetic elastic composites.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332
本文编号：2504649
[Abstract]:Electromagnetic elastic composites have a wide range of applications in the field of modern science and technology. with the development of material science, it has become an important intelligent material and structure. The effective electromagnetic elastic coefficient is an important parameter of electroelastic composites and is strongly affected by the microstructure of the composites, so it is of great significance to predict the effective electromagnetic elastic properties of electroelastic composites. In this paper, the effective electroelastic properties of electromagnetic elastic unidirectional fiber composites with periodic microstructure are studied. Taking the representative volume element of composite material as the research object, the electromagnetic elastic field in the representative volume element is obtained by applying periodic displacement, potential and magnetic potential boundary conditions on the boundary of the representative volume element, and using the PDE solution module of the finite element software Comsol Multiphysics. Based on the definition of average electromagnetic elastic field and effective electromagnetic elastic coefficient, the effective electromagnetic elastic coefficients of several kinds of periodic electromagnetic elastic composites are solved. The effective electromagnetic elastic coefficients of electromagnetic elastic composites with square arrangement element model are predicted respectively. Through an example, the difference of effective electromagnetic elastic properties between annular section electromagnetic fiber composites and circular cross section electromagnetic fiber composites under the same volume fraction of electromagnetic materials is compared. The effects of mechanical properties on effective electromagnetic elastic coefficients when piezoelectric and piezommagnetic fibers change each other and when the rigidity of the coating changes are discussed. The effective electromagnetic elastic coefficients of three kinds of piezoelectric magnetic materials with different arrangement are compared. The effect of failure on the effective electromagnetic elastic coefficient of electroelastic composites was studied. The conclusion of this paper can provide valuable reference for the design of high sensitivity electromagnetic elastic composites.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332
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