摘要
用挤压铸造工艺获得了拉伸强度较高并且强度数据分散度较小的莫来石纤维／ＺＬ１０９复合材料。用Ｗｅｉｂｕｌ方法分析该复合材料的拉伸强度值的分布状况，得到比较大的Ｗｅｉｂｕｌ模量。统计分析了复合材料中纤维体积分数和拉伸断口面上的纤维体积分数。结果表明，纤维的分布在宏观上是随机的而在微观上是不均匀的，与观察面法线呈小角度的纤维体积分数同与观察面法线成大角度的纤维体积分数比较接近；在断口面上与拉伸方向呈大角度的纤维体积分数同与拉伸方向呈小角度的纤维体积分数相差较大。认为该复合材料破坏的主要原因在于与拉伸方向呈大角度的纤维与基体的界面脱粘。拉伸强度数据分散的原因在于微观上与拉伸方向呈大角度的纤维分布的不均匀。
This paper presents a statistical evaluation of the tensile strength of the mullite shortfibrereinforced aluminium composite, which was produced by squeeze casting, by means of Weibull statistics. The result shows that the material has a high and reliable tensile strength. Volume fractions (Vf) of fibres in the material and on the fracture have been statistically analyzed. The spread of fibres shows a heterogeneity in microstructure. Two kinds of fibres, one making a small angle with the normal of the observed surface or with the tensile direction and another making a big angle with that, have hardly equal Vf. The latter has a larger Vf than the former, and the larger the Vf on the fracture, the less the tensile strength. The reason that the composite fails is the debonding of interface between the largeanglefibre and the matrix. The reason that the strength distributes in a certain range is the heterogeneity of the largeanglefibres.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
1999年第2期57-61,共5页
Acta Materiae Compositae Sinica
基金
国家自然科学基金
关键词
复合材料
统计分析
界面脱粘
强度
莫来石纤维
mullite/ZL109 composite, statistical analysis, debonding of interface
