J. Mater. Sci. Technol. ›› 2011, Vol. 27 ›› Issue (5): 443-452.

• Reviews • 上一篇    下一篇

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

Ali Nazari1,Jamshid Aghazadeh Mohandesi2,Shadi Riahi1   

  1. 1. Islamic Azad University (Saveh Branch)
    2. Amirkabir University of Technology
  • 收稿日期:2010-07-17 修回日期:2010-10-16 出版日期:2011-05-28 发布日期:2011-05-28
  • 通讯作者: Ali Nazari

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

Ali Nazari1), Jamshid Aghazadeh Mohandesi2), Shadi Riahi1)   

  1. 1) Department of Technical and Engineering Sciences, Islamic Azad University, Saveh Branch, Iran
    2) Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
  • Received:2010-07-17 Revised:2010-10-16 Online:2011-05-28 Published:2011-05-28
  • Contact: Ali Nazari

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摘要： 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 type, and volume fraction and position of containing phases. According to the area under stress-strain curve of each layer in the functionally graded composites, a mathematical model has been presented to fracture toughness prediction 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.

Abstract: 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.

Key words: Fracture toughness, Modeling, Functionally graded steel, Crack divider configuration, Position of the containing phases