Optimized butterfly specimen for the fracture testing of sheet materials under combined normal and shear loading

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Experiments and modeling of anisotropic aluminum extrusions under multi-axial loading – Part II: Ductile fracture (2012, background): “The shape of the specimen has been designed such that fracture initiates near the specimen center at a stress state of pure shear (Mohr and Henn, 2004, 2007; Dunand and Mohr, 2011).”
Effect of Lode parameter on plastic flow localization after proportional loading at low stress triaxialities (2014, background): “…introduction of loading, the localization of deformation at the specimen level (necking), and the detection of the onset of fracture (e.g. Bao and Wierzbicki, 2004, Mohr and Henn, 2007, Brünig et al., 2008, Fagerholt et al., 2010, Gao et al., 2011, Dunand and Mohr, 2011a, Haltom et al., 2014).”
Ductile failure modeling (2016, methodology): “Details may be found in Dunand and Mohr [98,99].”
Micromechanically-motivated phenomenological Hosford–Coulomb model for predicting ductile fracture initiation at low stress triaxialities (2015, methodology): “The presence of voids may be neglected when describing the macroscopic elasto-plastic response of sheet metal at low stress triaxialities (e.g. Dunand and Mohr (2011a)).”