(西安交通大學材料科學與工程學院，西安710049)
摘 要: 定向地分析了孔隙含量、形狀及其不同的位向關系在材料斷裂過程中的行為，采用灰色系統(tǒng)方法處理試驗數(shù)據(jù)，由此建立抗彎強度σbb與孔隙度θ間的數(shù)學方程:σbb=σ0e-βθ，式中σ0為材料孔隙度θ趨近于零時的歸算抗彎強度值，β為表征孔隙形狀及其位向關系的特征指數(shù)。所建立的方程式與實驗值吻合較好。
關鍵字: 粉末冶金 多孔材料 灰色系統(tǒng)
POROSITY OF COPPER-GRAPHITE COMPOSITE
（School of Materials Science and Engineering,
Xi′an Jiaotong University, Xi′an 710049）
Abstract:The effects of pore in the composite on bending strength were studied. A grey equation was set up using grey system method to analyze the relation between porosityθand bending strengthσbbof the material, which isσbbσ0e-βθ,whereσ0is the limit bending strength asθtends toward zero, andβis a characteristic constant related to pore shape, pore size and pore orientation. The derived equation fits well with the experimental data.
Key words: powder metallurgy porous material grey system
