Crack induced slip processes in 3D

Three-dimensional crack initiation mechanisms in bcc-Fe under loading modes I, II and III

“…These mechanisms have been observed in the literature for the same crystallographic orientation [34,30,37]. The orientation relations for the bcc-fcc phase transformation are the same as for orientation 2.…”

“…As shown in Refs. [1,2,27,28] the mechanism for this orientation is brittle fracture for long and semi-infinite cracks and brittle fracture accompanied by twinning for shorter ones [5,27,[29][30][31][32]]. Fig.…”

Orientation-dependent crack-tip blunting and crack propagation in a single crystal BCC iron

“…Shastry and Farkas [24] noticed that the crack extended in a brittle manner for [100] crack front of α-iron, while a ductile response was observed for [110] crack front for cracks on a (110) plane at 0 K temperature. Using an N-body Finnis-Sinclair (F-S) potential, Hora et al [25] simulated two cracks of α-iron on a (001) plane at the temperatures of 0 and 300 K. They reported that the central cracks extend in a brittle manner at the temperature of 0 K, while at the temperature of 300 K, pronounced slip occurs. Similarly, Machová and Beltz [26] also observed crack extension by bond breaking along the original crack plane of (001) at 0 K temperature for α-iron.…”

Atomistic modeling of penny-shaped and through-thickness cracks in bcc iron

“…Hora et al [7] simulated two cracks on a (0 0 1) plane at temperatures of 0 and 300 K using an N-body Finnis-Sinclair (F-S) potential. A central (0 0 1)[0 1 0] crack was found to extend in a brittle manner at 0 K, but at 300 K a slip occurred on {1 0 1} planes at angles ±45 • in front of the crack tip and, at higher loads, on {1 1 2} planes at angles ±26.565 • .…”