磁致伸缩复合材料有效性能的变分渐近细观力学模型

发布时间：2018-05-01 13:37

本文选题：磁致伸缩复合材料 + 细观力学　；参考：《复合材料学报》2017年03期

【摘要】：基于一种新颖的建模方法——变分渐近均匀化理论,建立了磁致伸缩复合材料的细观力学模型,以准确预测材料的有效属性和局部应力、磁通密度分布。从建立磁致伸缩复合材料的总磁焓入手,将总磁焓中的场变量精确解表示为平均值和波动函数之和。根据最小势能原理,利用细宏观尺度比作为小参数对约束条件下总磁焓求驻值(最小化)建立细观力学模型。为分析实际工程中的微观结构,利用有限元离散技术实现构建模型的数值模拟。CoFe_2O_4/环氧树脂复合材料数值算例结果表明:构建的模型可准确预测磁致伸缩复合材料的有效属性和局部场分布,并可扩展到其他多相复合材料的有效属性和局部场分析中。
[Abstract]:Based on a novel modeling method, the variational asymptotic homogenization theory, a micromechanical model of magnetostrictive composites is established to accurately predict the effective properties and local stresses of the material and the distribution of magnetic flux density. Starting with the total magnetic enthalpy of the magnetostrictive composite material, the exact solution of the field variables in the total magnetic enthalpy is expressed as the mean value. According to the principle of the minimum potential energy, a micromechanical model is established by using the fine macro scale ratio as a small parameter to the total magnetic enthalpy of the constraint conditions (minimization). In order to analyze the microstructure in the actual engineering, the numerical simulation of the numerical simulation of the.CoFe_2O_4/ epoxy resin composite by the finite element method is used. The calculation results show that the proposed model can accurately predict the effective properties and local field distribution of magnetostrictive composites, and can be extended to the effective properties and local field analysis of other multiphase composites.

【作者单位】：重庆大学土木工程学院;山地城镇建设与新技术教育部重点实验室(重庆大学);
【基金】：国家自然科学基金(11272363;51279218) 中央高校基本科研业务费专项基金(106112014CDJZR200017)
【分类号】：TB33

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