strength-of-ceramics3-point flexural stressingof ceramic specimensThe critical highly stressed volume is inthe range of "mm3"Matchbox for size comparisonBendingspecimenDark zone is highly criticallystressed by tension loads. The stressed volume is in therange of "cm3". Ductile materialBrittle material100806040200Relative usabletensile strength [%]Turbine partSpecimenAssumed specific valuesWeibull modulus (Weibull parameter) brittle material: m1 = 8 tough material: m2 = 32Stressed volume Specimen: Vp = 1 mm3 Turbine part: VB = 1000 mm3If materials such as ceramics or intermetallic phasesbehave brittly, then their utilizable strength dependsdecisively on the volume of the specimens that wereused to determine their strength!Tensile fracture strengthof metalsLife span until spalling of PVDthermal barrier coatingsMetal creepDynamic fatigue of metalsOxidation life span of metal coatingsGreater scatteringWeibull modulus6050403020100Typical ranges of the Weibullmodulus for properties ofgas turbine materialsArea with differentdatasets