δ－Al_2O_3纤维／Al－12Si复合材料室温拉伸强度分析

ANALYSIS ON ROOM TEMPERATURE TENSILE STRENGTH OF δ-Al_2O_3, FIBER / Al-12Si COMPOSITE

对δ－Ａｌ２Ｏ３纤维／Ａｌ－１２Ｓｉ复合材料室温拉伸强度的分析表明，在实验条件下该复合材料存在δ－Ａｌ２Ｏ３纤维的最小体积分数Ｖｍｉｎ和临界体积分数Ｖｃｒｉｔ，并求出其基体强度σ＇ｍ和室温强度σｃ－δ－Ａｌ２Ｏ３纤维体积分数Ｖｆ直线方程及纤维的临界长度ｌｃ和复合材料的剪切应力τｉ．确定复合材料的ＲＯＭ预测曲线。

Room temperature tensile strength analysis of δ-Al2O3 fiber reinforced Al-12Si alloy matrix composite showed that this kind of composite existed Vmin (minimum volume fraction) and Vcrit, (critical volume fraction) under the experimental conditions used in this paper, and its σ'm (substrate strength),σc (tensile strength)-Vf (volume fraction of δ-Al2O3 fiber) linear equation, lc (critical length of fiber) and Ti (shear stress of composite) were worked out. While ROM prediction of composite is decided, it should be decided if its σum (strength of non-reinforced alloy) equals σ'm firstly, then correct conclusion can be obtained.