SiC_(foam)/Al双连续相复合材料的压缩行为

Compressive behavior of SiC_(foam)/Al co-continuous composites

采用实验和模拟相结合的方法,利用ANSYS有限元软件对SiCfoam/Al(碳化硅泡沫增强铝基复合材料)双连续相复合材料的压缩行为进行了研究,分析变形过程中应力应变分布和材料特殊双连续结构对复合材料性能的影响。结果表明:应力和应变分布都具有明显的轮廓曲线,且与SiC泡沫轮廓吻合,最大应力和应变均出现在泡沫筋的连接区,加速了材料的失效。复合材料的弹性模量同时具有奇异的成分效应和结构效应,即弹性模量不但与材料成分有关,而且由材料中连续的强化相决定,特殊的双连续相结构使复合材料具有高的弹性模量和压缩屈服强度。随着增强体体积分数的增加,复合材料的屈服强度具有最大值,模拟结果和实验结果一致。

Compressive behavior of SiCfoam/ Al co-continuous composites were investigated by using of simulation based on ANSYS software and experiment,and the distribution of stress and strain during the deformation of co-continuous composites and effect of the novel cocontinuous structure on the properties were discussed.The results show that the distribution of stress and strain appears the profile similar to the structure of SiC foam and the maximum stress and strain appear at the conjunction knot of struts,which make the composites fail easy.The elastic modulus of co-continuous composites have novel composition and structure effect,which means the elastic modulus of composites depend on composition and structure of the composite.When the reinforcement is continuous,the modulus is mainly affected by the reinforcement.The unique co-continuous structure of composites makes the composites have high elastic modulus,compressive yield strength.With the increase of reinforcement volume fraction,the yield strength gets peak value,which is in accord with the result of experiment.