J-integral evaluation of austenitic–martensitic functionally graded steel in plates weakened by U-notches

• Published in: Engineering fracture mechanics Vol. 77; no. 16; pp. 3341 - 3358
• Main Authors: Barati, Ehsan, Alizadeh, Younes, Mohandesi, Jamshid Aghazadeh
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.11.2010; Elsevier
• Subjects: Critical load; Electroslag melting; Electroslag remelting; Exact sciences and technology; FG steel; Fracture mechanics; Fracture mechanics (crack, fatigue, damage...); Functionally gradient materials; Fundamental areas of phenomenology (including applications); J integral; Mechanical properties; Notches; Physics; Plates; Solid mechanics; Static elasticity (thermoelasticity...); Steels; Structural and continuum mechanics; U-notch; Critical load; J-integral; Electroslag remelting; FG steel; U-notch; Elastic constant; J integral; Martensitic steel; Deformation modulus; Notch; Rupture; Mechanical properties; Modeling; Plate; Young modulus; Phase transformation; Poisson ratio; Austenitic steel; Functionnally graded material; Martensitic transformation; Fracture load
• ISSN: 0013-7944; 1873-7315
• DOI: 10.1016/j.engfracmech.2010.08.020

In this paper, a numerical method for J-integral evaluation of plates weakened by U-notches for brittle or quasi-brittle functionally graded steel (FGS) has been proposed. The material contains austenite phase in addition to martensite layer produced by electroslag remelting (ESR). The Young’s modulus and the Poisson’s ratio have been assumed to be constant, while other mechanical properties vary exponentially along the specimen width. The effect of notch depth on the J-integral and the critical fracture load has been studied. A comparison of the J-integral between functionally graded and homogeneous steels was made, where the notch tip in the functionally graded steel is situated in a layer with same mechanical properties as the homogeneous steel.