Journal
ENGINEERING FRACTURE MECHANICS
Volume 204, Issue -, Pages 29-45Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2018.09.026
Keywords
Interstitial free (IF) steel; Tearing resistance; EWF method; Crack tip opening angle; Cohesive zone model
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Essential Work of Fracture (EWF) method has been used to evaluate ductile tearing resistance of interstitial-free (IF) steel sheet of 1mm thickness. Experiments have been done on double edge notched tensile (DENT) specimens with and without fatigue precracking at three different quasistatic ramp rates. The fracture in all cases was flat with maximum specimen necking of 36% of thickness. The estimated crack tip opening angle (CTOA, psi(e)) was found to be essentially independent of rho, and also of deformation rate. The critical CTOA (phi(e)) was optically estimated using a precracked DENT specimen. Also, the tearing resistance parameters obtained from EWF tests have been compared with that determined using 3-dimentional Finite Element Modeling (FEM). Results of FEM, along with a chosen traction-separation law, were used in a 3-dimentional Cohesive Zone Model (CZM) for flat fracture to simulate crack growth behavior in the DENT specimens.
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