Flat to slant ductile fracture transition: Tomography examination and simulations using shear-controlled void nucleation

Thilo F. Morgeneyer (1) , Jacques Besson (1)

1 MAT - Centre des Matériaux

Tomography examination of arrested cracks at crack initiation, flat to slant transition and slant propagation indicates a clear change in micromechanisms from high-stress triaxiality void growth to shear-dominated coalescence in the slant regime. A Gurson-type model is used and a shear void nucleation term based on the Lode parameter for strain rate is suggested for simulation of a fully meshed sample, which achieves flat to slant crack transition at loads close to experimental results for aluminium.

Mots clés: Flat fracture; Slant fracture; Lode parameter; Shear; X-ray tomography

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Thilo F. Morgeneyer, Jacques Besson. Flat to slant ductile fracture transition: Tomography examination and simulations using shear-controlled void nucleation. Scripta Materialia, 2011, 65, pp.1002-1005. ⟨10.1016/j.scriptamat.2011.09.004⟩. ⟨hal-00658608⟩