Calculate critical area
areaCrit(vickers, stress, factor = 1.56, scale = 1e+06)specific Vickers hardness
stress level
specific material dependent factor, default set to 1.56 for inner defects
area in square millimeters (default)
critical area in \([mm]^2\) (default)
The critical area (see reference below) is roughly defined by the projected defect area above which the specific material defect becomes particularly hazardous for the failure of the whole specimen.
Y. Murakami (2002). Metal Fatigue: Effects of Small Defects and Nonmetallic Inclusions. Elsevier, Amsterdam.