A New Methodology for Estimating Fracture Criterion of Thin Sheets

Kalyan Kumar Ray; Ashmita Patra; Debashish Bhattacharjee

doi:10.4028/www.scientific.net/KEM.417-418.305

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The Configurational Force Concept in Elastic-Plastic Fracture Mechanics−Instructive Examples
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Crack Behaviour in Laminar Ceramics with Strong Interfaces
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A New Methodology for Estimating Fracture Criterion of Thin Sheets
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A New Methodology for Estimating Fracture Criterion of Thin Sheets

Abstract:

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.