PSI - Issue 18

Matthias Hell et al. / Procedia Structural Integrity 18 (2019) 823–836 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 15. Discretized stress-strain behaviour for the numerical assessment of a component S-N curve

The results in Fig. 16 underline, that the implementation of a cycle dependent material behaviour may improve the fatigue life estimation.

Fig. 16. Implementation of a cycle dependent material behaviour in the fatigue life assessment

For the notched specimens, variable amplitude loading tests with a Gaussian distributed load spectrum were conducted. On Basis of the numerically estimated nominal S-N curves, Fig. 17, a damage accumulation was executed, using the Palmgren-Miner Rule modified according to Haibach [15] on the basis of the external load spectrum.

Fig. 17. Damage accumulation acc. to Palmgren-Miner, modified acc. to Haibach, spectrum Gauß