Abstract
The present work deals with the characterization of ductile tearing resistance of 1 mm thick interstitial free steel sheet using crack tip opening angle (φ), and δ5 concepts with some experimental modification. CTOA (φ) measurements on the specimen surface at the growing crack tip have been performed using light microscope on both pre-cracked DENT and SENT specimens at three ramp rates following the essence of ASTM E 2472. In order to determine the effect of pre-cracking, CTOA of the notched (ρ:0.1 mm) SENT specimen has also been measured at 10-4 s-1. The transferability of φ−Δα and δ5−Δα between two geometries has been verified. It is concluded that for a specified thickness both φ−Δα and δ5−Δα plots can be used for crack growth characterisation of sheet metals even without using pre-cracked specimens. However, the angle φ(δ5) determined from δ5−Δα curve is not the true measure of optical CTOA,φ as the δ5 gauge position does not follow the tip position of the growing crack.
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