Effect of Layers Position on Fracture Toughness of Functionally Graded Steels in Crack Divider Configuration  

作　　者：Ali Nazari Jamshid Aghazadeh Mohandesi Shadi Riahi 

机构地区：[1]Department of Technical and Engineering Sciences,Islamic Azad University [2]Department of Mining and Metallurgical Engineering,Amirkabir University of Technology

出　　处：《Journal of Materials Science & Technology》2011年第5期443-452,共10页材料科学技术（英文版）

摘　　要：In the present study, fracture toughness of functionally graded steels in crack divider configuration has been modeled. By utilizing plain carbon and austenitic stainless steels slices with various thicknesses and arrangements as electroslag remelting electrodes, functionally graded steels were produced. The fracture toughness of the functionally graded steels in crack divider configuration has been found to depend on the composites＇ type together with the volume fraction and the position of the containing phases. According to the area under stress-strain curve of each layer in the functionally graded steels, a mathematical model has been presented for predicting fracture toughness of composites by using the rule of mixtures. The fracture toughness of each layer has been modified according to the position of that layer where for the edge layers, net plane stress condition was supposed and for the central layers, net plane strain condition was presumed. There is a good agreement between experimental results and those acquired from the analytical model.In the present study, fracture toughness of functionally graded steels in crack divider configuration has been modeled. By utilizing plain carbon and austenitic stainless steels slices with various thicknesses and arrangements as electroslag remelting electrodes, functionally graded steels were produced. The fracture toughness of the functionally graded steels in crack divider configuration has been found to depend on the composites＇ type together with the volume fraction and the position of the containing phases. According to the area under stress-strain curve of each layer in the functionally graded steels, a mathematical model has been presented for predicting fracture toughness of composites by using the rule of mixtures. The fracture toughness of each layer has been modified according to the position of that layer where for the edge layers, net plane stress condition was supposed and for the central layers, net plane strain condition was presumed. There is a good agreement between experimental results and those acquired from the analytical model.

关 键 词：Fracture toughness Modeling Functionally graded steel Crack dividerconfiguration Position of the containing phases 

分 类 号：TG142.15[一般工业技术—材料科学与工程]