This paper proposes the utilization of a simple truncated lobe conical shape with varying drawing angles ψ produced by single point incremental forming (SPIF) to determine the fracture strain pairs in crack opening mode by in-plane shear. The suppression of necking during SPIF makes the proposed test more adequate to determine the shear fracture forming limit line (SFFL) than conventional plane shear tests, which are known to experience significant plastic localization before failure by fracture ( Isik et al., 2014)