| SMA增强复合材料力学特性的细观力学模型 |
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| 引用本文： | 朱玉萍,兑关锁.SMA增强复合材料力学特性的细观力学模型[J].复合材料学报,2008,25(2):156-160. |
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| 作者姓名： | 朱玉萍 兑关锁 |
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| 作者单位： | 北京交通大学工程力学研究所,北京,100044 |
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| 基金项目： | 国家自然科学基金资助(50539030和90205007)和教育部留学回国人员科研启动基金资助项目 |
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| 摘 要： | 基于细观力学的理论 , 将 SMA增强复合材料视为三相等效系统进行分析 , 即基体相、 奥氏体相和马氏体相 ; 求解了 SMA增强复合材料的有效热膨胀系数和有效相变应变系数的一般表达式 , 该表达式适用于各种形状的纤维增强复合材料。在整个相变和逆相变过程中 , 奥氏体相和马氏体相都表现为弹性特性 , 避免了传统方法的强非线性问题。该模型计算过程简单 , 同时还考虑了奥氏体、 马氏体和基体间的相互作用 , 理论分析更接近实际。并分析了纤维的含量、 形状和尺寸等因素对宏观模量的影响 , 通过比较可知 , 所得结果可靠 , 为 SMA增强复合材料的设计和使用提供理论依据。
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| 关 键 词： | 形状记忆合金 复合材料 热膨胀系数 相变应变系数 细观力学 |
| 文章编号： | 1000-3851(2008)02-0156-05 |
| 收稿时间： | 2007-06-18 |
| 修稿时间： | 2007年6月18日 |
Micromechanical modeling of mechanical property for SMA reinforced composite |
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| ZHU Yuping,DUI Guansuo.Micromechanical modeling of mechanical property for SMA reinforced composite[J].Acta Materiae Compositae Sinica,2008,25(2):156-160. |
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| Authors: | ZHU Yuping DUI Guansuo |
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| Affiliation: | ( Institute of Mechanics, Beijing Jiaotong University, Beijing 100044, China) |
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| Abstract: | A three-phase model for the thermal expansion coefficient and t ransformation strain coefficient of the
shape memory alloy composite was developed , in which the composite was considered as the austenitic phase , the product phase ( martensite phase ) and the mat rix phase. The common expressions for the thermal expansion coefficient and t ransformation strain coefficient of the shape memory alloy composite were derived based on the micromechanical analysis. The expressions can be fit for fibers with various shapes. Compared with the t raditional method , non-linearity of shape memory alloy need not be considered. Not only was the method simple , but also the interaction among the three phases was considered. As an application of the model , the at tention was paid to the effects of the fiber geometry , various shapes and volume ratio of fibers in the composite on the effective thermal expansion coefficient and t ransformation strain coefficient of the composite. By comparing with references , it is shown that the results are credible. It is helpful to the design of intelligent composites. |
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| Keywords: | shape memory alloy composite thermal expansion coefficient t ransformation st rain coefficient micromechanics |
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