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Fatigue life estimation of notched components under multiaxial non-proportional loading with variable amplitudes.

Calculation concepts for determining component fatigue life under non-proportional variable amplitudes loading were investigated.

The fatigue life of notched components until technical crack initiation can be described using the local strain concept. For fatigue life estimation under locally non-proportional loadings, the concept of critical planes has proven effective. In this approach, fatigue life in different planes is examined through the material element at the notch root. The plane with the lowest fatigue life is considered the critical plane.

The presented algorithm consists of two parts: a notch simulation to determine local multiaxial, elasto-plastic stresses and a subsequent damage assessment using the critical plane method.

In this work, the…

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Calculation concepts for determining component fatigue life under non-proportional variable amplitudes loading were investigated.

The fatigue life of notched components until technical crack initiation can be described using the local strain concept. For fatigue life estimation under locally non-proportional loadings, the concept of critical planes has proven effective. In this approach, fatigue life in different planes is examined through the material element at the notch root. The plane with the lowest fatigue life is considered the critical plane.

The presented algorithm consists of two parts: a notch simulation to determine local multiaxial, elasto-plastic stresses and a subsequent damage assessment using the critical plane method.

In this work, the Fatemi/Socie parameter (shear-based), the Smith/Watson/Topper parameter (normal strain-based), and a parameter based on short crack fracture mechanics were investigated for accuracy. The accuracy assessment is based on a comprehensive dataset, including test results of notched specimens subjected to both proportional and non-proportional variable amplitude loading.

Reference
VAL5-2024-035

Title
Fatigue life estimation of notched components under multiaxial non-proportional loading with variable amplitudes.
Author(s)
J. Kraft, M. Vormwald
DOI
10.48447/VAL5-2024-035
Event
VAL5 - Fifth International Conference on Material and Component Performance under Variable Amplitude Loading
Year of publication
2024
Publication type
conference paper (PDF)
Language
English
Keywords
multiaxial fatigue,critical plane,notches