Numerical simulations of mixed-mode (I and II) notch tip fields in basal-textured magnesium alloys

Crystal plasticity based finite element (CPFE) simulations employing Taylor homogenization for a basal-textured Mg alloy are performed under plane strain, small scale yielding (SSY) conditions to study mixed-mode (I and II) notch tip fields. Two orientations considered. In one case, the line normal flat surfaces of taken parallel transverse direction (TD) rolling (RD), whereas in other, they aligned with (ND) TD. The results compared against those obtained from an isotropic (von Mises) model identical stress–strain behavior RD tension. maximum plastic zone size at given level effective stress intensity factor |K|, enhances mode II component (i.e., decrease mixity parameter Me), is larger ND–TD orientation. Further, {101̄2} or tensile twinning (TT) occurs near stretched part surface, more profuse as Me reduces especially case. It found that Me, orientation can profoundly affect distribution equivalent strain hydrostatic around tip, which underscores importance anisotropy alloys. Finally, by appropriate fracture criteria computed near-tip fields, variations toughness operative mechanism predicted TD–RD corroborate well recent experimental study.