PSEUDO STRESS AND PSEUDO STRAIN BASED APPROACHES TO MULTIAXIAL NOTCH ANALYSIS

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Abstract
The analysis of notch stresses and strains is one of the key parts of fatigue life prediction of components and structures, In this paper two related approaches are introduced, covering the whole field from uniaxial to multiaxial non‐proportional loading. The pseudo stress at the notch root computed by theory of elasticity is introduced as the governing variable for elastic‐plastic notch analysis. Although the pseudo stress is just a specially defined nominal stress, it eases notch analysis in comparison to using arbitrarily definable nominal stresses, especially for non‐proportional multiaxial loading. Additionally a pseudo strain based approach is introduced and compared to the stress approach. Both proportional and non‐proportional loading are discussed, and compared with the approaches of other workers.

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