probability-of-a-disk-fractureProbability of one flaw occurring perpart W1 Probability of the flaw being locatedin a highly-stressed zone W2Probability of a dangerous flaworientation W3Probability that the flaw willnot be discovered duringinspection W5Probability of a flaw occurringthat leads to dangerous crack initiation W5 = W1x W2x W3x W4x W5Probability of a dangerous flawsize W4Typical highly-stressed disk zones are coloredblackDangerousflaw sizeFrequencyFlaw sizeProbability of detectionFlaw size100%0%Estimating the probability of a disk fracture as the result of amaterial flaw:Characteristic flaw size is the cracklength at the surface in the projectionperpendicular to the load directionSemi-finished part productionDesign/configurationNon-destructive testing