Analysis Of Stresses And Strains Near The End Of A Crack Traversing A Plate Irwin ##HOT##
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Irwin's plate elastic fracture mechanics model neglects the inelastic or plastic deformation of the material at the crack tip, and small deformations of the specimen. In this study, Irwin's model was extended to include plastic and inelastic behavior at the crack tip. The theory was based on the work previously done by Griffith and others that described material fracture as the result of a process of superheating at the crack tip and called crack-tip load . Griffith formulated the well-known Euler-consistent-criteria to determine when a given crack will fail (i.e, when the crack length is called "critical" length "c"). Subsequently, in the 1950s and 1960s, an alternative theory known as the "near-tip-linear-theory" (NTL) was developed to describe crack propagation. The NTL theory is based on the prediction that the crack tip stress grows approximately linearly with normal crack tip displacement and the final fracture stress is obtained by extrapolation from the linear-elastic fracture toughness (KIc) towards the crack length of "c".
Note: The NTL theory has been proved only for planar cracks, for circular or semi-circular notches, and for asymptotic cracks with infinite notch radii; while only for quasi-static mode of loading and for high-temperature environments. The validity of NTL model for finite strains in the asymptotic regime and for different notch geometries, particularly for deep cracks, is still open to debate (Sriram, 2010).
An experimental study for RC plate was performed to demonstrate the validity and reliability of the present results developed by the authors. The test was performed on a non-notched NC (through-thickness) plate specimens of 0.5 mm thickness gauge and a 25 mm diameter. d2c66b5586