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Consideration of the transient material behavior under variable amplitude loading in the fatigue assessment of nodular cast iron using the strain-life approach
  • Jan Hesseler,
  • Jörg Baumgartner,
  • Christoph Bleicher
Jan Hesseler
Fraunhofer Institute for Structural Durability and System Reliability LBF
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Jörg Baumgartner
Fraunhofer Institute for Structural Durability and System Reliability LBF
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Christoph Bleicher
Fraunhofer Institute for Structural Durability and System Reliability LBF
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Abstract

The consideration of realistic load assumptions is important for the fatigue design of highly stressed nodular cast iron components for wind energy application. Especially in case of overloads causing elastic-plastic deformation, residual stresses may have a strong impact on fatigue life. In strain-controlled fatigue tests with constant and variable amplitudes, the influence of overloads on the lifetime was investigated. The overload was applied with the objective to create high tensile residual stresses. During fatigue testing the transient material behavior, cyclic hardening, cyclic relaxation of the residual stresses as well as quasi static creep effects, of the EN-GJS-400-18-LT was recorded and evaluated. To quantify the influence of the transient material behavior on the calculated lifetime, fatigue analyses are carried out with the strain-life approach, both with and without consideration of the transient material behavior. The results show that conservative damage sums are derived if the transient material behavior, especially the relaxation of tensile residual stresses, is neglected.

Peer review status:ACCEPTED

16 Dec 2020Submitted to Fatigue & Fracture of Engineering Materials & Structures
16 Dec 2020Submission Checks Completed
16 Dec 2020Assigned to Editor
17 Dec 2020Reviewer(s) Assigned
07 Jan 2021Review(s) Completed, Editorial Evaluation Pending
08 Jan 2021Editorial Decision: Revise Major
07 Apr 20211st Revision Received
07 Apr 2021Submission Checks Completed
07 Apr 2021Assigned to Editor
07 Apr 2021Reviewer(s) Assigned
21 Apr 2021Review(s) Completed, Editorial Evaluation Pending
27 Apr 2021Editorial Decision: Revise Minor
07 May 20212nd Revision Received
07 May 2021Submission Checks Completed
07 May 2021Assigned to Editor
07 May 2021Review(s) Completed, Editorial Evaluation Pending
09 May 2021Editorial Decision: Revise Minor
10 May 20213rd Revision Received
22 May 2021Assigned to Editor
22 May 2021Submission Checks Completed
22 May 2021Reviewer(s) Assigned
22 May 2021Review(s) Completed, Editorial Evaluation Pending
23 May 2021Editorial Decision: Accept