, 43:25 | Cite as

The crack growth resistance of thin steel sheets under eccentric tension



The stable crack growth in thin steel sheets is the topic of this paper. The crack opening was observed using a videoextensometry system, allowing the crack extension determination. JR-curve and δR-curve were established from obtained data. The ductile tearing properties of different thin sheets of steel were determined, including the impact of the specimen orientation, from test performed on compact tension specimens loaded under two conditions. The effect of the material, the rolling direction, and loading rate on the crack growth resistance of thin steel sheets was analyzed. In addition to the crack growth resistance, J-integral values for crack initiation were also estimated. The relation between J i and J0.2 was assessed using the basic mathematical and statistical methods. This relation was described by a linear regression model.


Cold-formed steel thin sheet stable crack growth R-curve videoextensometry 

List of symbols


area under the load–displacement curve


elongation (initial length 80 mm)


crack length


initial crack length


stretch zone height


crack propagation


parameter, values vary from 1 to 20




crack mouth opening displacement


compact tension

CTOD (δ)

crack tip opening displacement


CTOD at which stretch zones appear on fracture surfaces


critical CTOD for ductile crack initiation


CTOD resistance curve


slope of δR-curve


dual-phase steel


slope of JR-curve


Young’s modulus

HR 45

microalloyed steel


interstitial free steel


line integral (path-independent) around the crack tip


value of J-integral for observable crack initiation


J-integral resistance curve


value of J-integral of conventional crack initiation for 0.2 mm crack propagation


yield strength


tensile strength


0.2% offset yield strength


scanning electron microscopy


stretch zone


tearing modulus


notch opening




stretch zone width


distance of measurement point from the load-line


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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Technical University of KošiceKošiceSlovak Republic

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