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Modelling Short Crack Propagation under Variable Structural and Thermal Loadings
  • Alexander Bosch,
  • Michael Vormwald
Alexander Bosch
MTU Aero Engines AG
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Michael Vormwald
Technische Universit├Ąt Darmstadt
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Abstract

Concepts for crack propagation as well as fatigue assessment under variable mechanical and thermal loadings are unestablished. For variable mechanical loadings, the damage parameter PJ is well known, for thermal loadings the damage parameter DTMF is established. Both parameters base on the effective cyclic J-Integral, still the definition is different. The damage parameters PJ considers the effective stress and strain ranges from the upper reversal point of each load cycle to the point of crack closure. Depending on the loading sequence the point of crack closure is treated as a history variable. In addition, with a crack length dependant fatigue limit, the most important sequence effects are considered. A new PJ-based concept is developed by considering additional sequence effects. In comparison to experimental results, the developed concept is able to reduce scattering in the range of constant amplitude loading tests.

Peer review status:ACCEPTED

30 Oct 2020Submitted to Fatigue & Fracture of Engineering Materials & Structures
09 Nov 2020Submission Checks Completed
09 Nov 2020Assigned to Editor
12 Nov 2020Reviewer(s) Assigned
04 Dec 2020Review(s) Completed, Editorial Evaluation Pending
20 Dec 2020Editorial Decision: Revise Major
17 Feb 20211st Revision Received
19 Feb 2021Submission Checks Completed
19 Feb 2021Assigned to Editor
20 Feb 2021Review(s) Completed, Editorial Evaluation Pending
22 Feb 2021Editorial Decision: Accept