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A new methodology for estimating fracture criterion of thin sheets
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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 (δ_c) corresponds to a specific amount of load drop during fracture toughness tests. The suggested technique yields δ_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 δ_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.
fracture toughness criterionessential work of fracturecrack tip opening displacementenergy extrapolation techniqueload drop techniqueinterstitial free steel
K. K. Ray、A. Patra、D. Bhattacharjee
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Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur-721302, India
R&D and Scientific Services, TATA Steel Ltd, Jamshedpur, Jharkhand, India
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