A Novel Technique for Extracting Stretch Zone Features from Fractographs

摘要: The crack tip blunting process leaves an imprint in the form of stretch zone on fracture surfaces during event ductile fracture. A schematic representation a fractured specimen and corresponding fractographs is shown Fig. 1. typical has two components, width (SZW) depth (SZD). SZW basically virtual extension Δa SZD half CTOD,. Stretch zones can be easily identified, when observed under SEM, since they have visually identifiable boundaries between fatigue precracked region Open image new window FIGURE 1. (a) Elevation profile (b) SEM surface