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Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   APRIL 2016 , Volume 16 , Number 1; Page(s) 307 To 316.
 
Paper: 

J INTEGRAL EVALUATION OF U-NOTCHED BAINITIC FUNCTIONALLY GRADED STEEL PLATES IN NOTCH ARRESTER AND NOTCH DIVIDER CONFIGURATION

 
 
Author(s):  SAEIDI MOHAMMAD REZA, ALIZADEH VAGHASLOU YOUNES*
 
* DEPARTMENT OF MECHANICAL ENGINEERING, AMIRKABIR UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN
 
Abstract: 

In the present study, the bainitic form (ferrite-bainite-austenite) of Functionally Graded (FG) steel has been produced using the Electro Slag Remelting (ESR) process. The position of each layer has been determined utilizing the Metallography and Vickers Hardness tests. In order to investigate the fracture behaviour of the notched FGS specimens, the three point bending test configuration has been utilized. The fracture of the notched specimens has been examined in the form of the notch arrester and notch divider. For the mode loading case, the effect of the notch depth on the critical fracture load and Jcr value have been studied. In order to present the differences between the FG and homogeneous steels, the J values of them under constant load have been investigated. Moreover, the effect of the notch depth on the J values for the mentioned case have been studied. Results show that for the notch arrester type the maximum value of the critical facture load has been obtained when the notch tip is located at the beginning of Bainite phase. Results also show that the Jcr values are severely dependent on the material properties of the layers which are located at the front of the notch tip. Results show that for the notch divider type the response of the FG steel specimens is similar to the homogeneous ones. Also, in this case the variation of the Jcr with respect to the notch depth is negligible. The J value of each of the studied configurations was then computed using finite element approach based on Rice theory and good agreement was observed between numerical results with the experimental ones.

 
Keyword(s): FUNCTIONALLY GRADED STEEL, J INTEGRAL, NOTCH, MODE LOADING, FINITE ELEMENT APPROACH
 
References: 
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