短纤维增强金属基复合材料微屈服行为的细观力学分析  

MICROMECHANICS ANALYSIS OF MICROYIELD BEHAVIOR OF SHORT FIBER REINFORCED METAL MATRIX COMPOSITE

作　　者：吴晶[1] 李文芳[1] 蒙继龙[1] 

机构地区：[1]华南理工大学机械工程学院,广州510641

出　　处：《金属学报》2003年第7期761-766,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金19972021

摘　　要：在Eshelby等效夹杂方法和双夹杂模型等的基础上建立了细观力学模型,定量计算了短纤维增强金属基复合材料的微屈服行为,计算结果表明:在基体材料的微屈服行为符合Brown-Lukens线性规律的情况下,复合材料的σ-〈ε~p〉^(1/2)也近似符合Brown—Lukens规律,同时,计算了增强体短纤维的含量、形状、热残余应力和位错密度诸因素对复合材料微屈服规律的影响。The microyield behavior of the short fiber reinforced metal matrix composite (MMC) is computed by micromechanics model based on the Eshelby's equivalent method and double-inclusion model. The result shows that the MMC's microyield behavior accords with Brown-Luken's relation approximately if the matrix material obeys Brown-Luken's relation. The MMC's microyield strength is lower than that of the matrix material. The effect of fiber volume fraction, fiber aspect ratio and density of dislocation on the process of MMC's microyield are studied quantitatively.

关 键 词：金属基复合材料 短纤维 微屈服 细观力学 

分 类 号：TB330.1[一般工业技术—材料科学与工程]