In many cases, components and structures are designed for a specific service lifetime. If this is exceeded, the initial design assumptions no longer apply. Formally seen, further use is subject to an increased safety risk.
Using fracture mechanical fatigue calculations, we can determine statements about possible service life extensions and redefine inspection intervals. The method is technically established, but requires special prior knowledge for the determination of boundary conditions and the selection of adapted material characteristics.
If cracks occur, the remaining service lifetime can also be determined using this method. This provides planning reliability.