Abstract
In standard test procedures the determination of fatigue crack growth threshold values is part of da/dN–ΔK-curve determinations, and with one specimen only one threshold value can be determined. Thus, the complete characterization of the threshold behaviour of a certain material, for example, by ΔKth–R-curves, is extremely time consuming, specimen consuming and expensive. Based on experimental experience, a procedure is described which allows a complete ΔKth–R-curve determination with a single specimen. The threshold behaviour of a material can be described by four constants, which can easily be determined. A very simple analytical description of the threshold behaviour of materials is given, by which even quite complicated appearing ΔKth-R-curves can be represented.
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