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- Title
A comparative analysis of step loading and staircase testing for fatigue strength estimation of an engine component.
- Authors
Thompson, Todd; Liu, Jinqiang; Hu, Chao
- Abstract
Staircase testing is a standard method for evaluating the fatigue strength of components. However, staircase testing assumes a normal distribution, while components can display bimodal behavior due to flaws in material, or issues during the manufacturing process. Three unique step loading data sets on different production crankshafts provide evidence that step loading reliably identifies material or manufacturing issues, which lower a component's fatigue strength. Staircase testing has an 87% or greater chance of overestimating the component's fatigue strength, which in turn overestimates the component's expected reliability. For example, a component with a 99.9% reliability based on staircase testing would only have a 74% reliability based on step loading. If a component contains an undetectable manufacturing defect, staircase testing has a 99% chance of overestimating the component's fatigue strength. Step loading reliably improves the estimation of a component's fatigue strength distribution while providing insights into a component's defect tolerance. Highlights: Staircase testing overestimates a component's fatigue strength.Step loading reliably identifies issues that lower a component's fatigue strength.Step loading improves estimation of a component's fatigue strength distribution.
- Subjects
FATIGUE limit; FATIGUE testing machines; STAIRCASES; HIGH cycle fatigue; MANUFACTURING defects
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2023, Vol 46, Issue 2, p667
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.13898