A New Methodology for Estimating Fracture Criterion of Thin Sheets
A simple and reliable method has been proposed for determining fracture toughness of thin sheets. The principle of the method considers that critical crack opening displacement (c) corresponds to a specific amount of load drop during fracture toughness tests. The suggested technique yields c value for an interstitial free (IF) steel as 2.04 mm in excellent correspondence with an indirect estimate of 1.97 mm from the popular energy extrapolation technique. The magnitude of c for IF steel sheets is found to decrease with decreasing thickness in agreement with the expected variation of this criterion with specimen thickness in gross yielding fracture mechanics (GYFM) regime.
M.H Aliabadi, S. Abela, S. Baragetti, M. Guagliano and Han-Seung Lee
K. K. Ray et al., "A New Methodology for Estimating Fracture Criterion of Thin Sheets", Key Engineering Materials, Vols. 417-418, pp. 305-308, 2010