Determination of local stresses and strains within the notch strain approach : the efficient and accurate calculation of notch root strains using finite element analysis

Masendorf, Lukas; Burghardt, Ralf; Wächter, Michael GND; Esderts, Alfons GND

For the service life estimation of metallic components under cyclic loading according to strain-based approaches, a simulation of the elastic-plastic stress–strain path at the point of interest is necessary. An efficient method for determining this stress–strain path is the use of the load–notch-strain curve, as this is also implemented within the FKM guideline nonlinear. The load–notch-strain curve describes the relationship between the load on the component and the local elastic-plastic strain. On the one hand, this can be estimated from loads or theoretical elastic stresses by using notch root approximations. On the other hand, this can be determined in a finite element analysis based on the elastic-plastic material behaviour. This contribution describes how this latter option is carried out in general and how it can be optimised in such a way that the FEA requires significantly less calculation time. To show the benefit of this optimisation, a comparative calculation on an exemplary geometry is carried out.

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Masendorf, Lukas / Burghardt, Ralf / Wächter, Michael / et al: Determination of local stresses and strains within the notch strain approach. the efficient and accurate calculation of notch root strains using finite element analysis. 2021.

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