Determination of CTOD resistance curves in side-grooved Single-Edge Notched Tensile specimens using full field deformation measurements

The experimental evaluation of fracture toughness of linepipe steels is increasingly performed through Single Edge Notched Tensile (SENT) testing. The notch constraint in these specimens closely matches that in pipes. This article explores the possibilities of using full field deformation and strain measurements during SENT testing. Based on the obtained deformation fields, the Crack Tip Opening Displacement (CTOD) has successfully been evaluated. In addition, the deformation near the cracked ligament allows estimating the amount of ductile crack extension for shallow notched specimens. The combination of both allows constructing resistance curves for the tested materials.