Figure 5

(a) Schematic illustration of an internal pore which nucleated a crack that remains engulfed within the pore mechanically affected region. is the projected area of the internal pore and crack, is the maximal remote stress and is the maximal local stress within the locally affected region. (b) 3D rendering of FE simulation on SLS-14 Pore 3 and Pore 4 showing (in green) the yielded volume with stresses higher than 335 MPa (for the shake of clarity, only these high values are shown). (c) FE simulation of SLS-14 Pore 3 showing the distribution of local σ_zz stress values above the nominal stress level in the region located approximately at the crack initiation site.