Abstract
Cast steel components are affected by manufacturing process-based imperfections, which severely limit their fatigue strength. In this work, the linear-elastic strain energy density concept is applied to assess the fatigue behaviour of bulk defect-afflicted components made of high-strength cast steel alloy G12MnMo7-4+QT. Based on analytical calculations, an energy-based design limit curve is derived which merges experimental results of notched and unnotched small–scale specimens into a statistically proven scatter band. The stress ratio dependency is also investigated. Moreover, a numerical methodology is introduced, which facilitates the energy-based fatigue assessment of complex spatial imperfections on the basis of radiographs. Validation of the established framework utilizing experimental results of defect-afflicted large–scale specimens leads to sound accordance of numerically and experimentally derived fatigue strength values, showing an average deviation of about only eight percent.
Original language | English |
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Article number | 3768 |
Number of pages | 23 |
Journal | Applied Sciences : open access journal |
Volume | 13.2023 |
Issue number | 6 |
DOIs | |
Publication status | Published - 15 Mar 2023 |
Keywords
- Cast steel
- Local fatigue assessment
- Defects
- Strain energy density