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Correlations between crack initiation and crack propagation lives of notched specimens under constant and variable amplitude loading
  • Melanie Fiedler,
  • Michael Vormwald
Melanie Fiedler
Dresden University of Technology

Corresponding Author:[email protected]

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Michael Vormwald
Technische Universit├Ąt Darmstadt
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This paper starts with an overview of the application of the three guidelines (GL) of the German Research Association of Mechanical Engineers (FKM). Each of these provides algorithms for calculating fatigue lives of components under constant or variable amplitude loading, however, with underlying different failure criteria, i.e. technical crack initiation life (GL-nonlinear), fatigue crack growth life (GL-fracture mechanics), and total fracture life (GL-linear). This paper introduces the U-Concept which has been evaluated from a large structural durability database. The U-Concept is a small add-on to the Local Strain Approach (LSA) which is the backbone of the GL-nonlinear. It enables 1) to directly calculate the fatigue life to total fracture based on elastic-plastic material behaviour according to the LSA, or 2) to estimate the remaining fatigue life from crack initiation to fracture without a crack growth simulation.
01 Mar 2021Submitted to Fatigue & Fracture of Engineering Materials & Structures
02 Mar 2021Assigned to Editor
02 Mar 2021Submission Checks Completed
03 Mar 2021Reviewer(s) Assigned
20 Mar 2021Review(s) Completed, Editorial Evaluation Pending
31 Mar 2021Editorial Decision: Revise Minor