Loading regimes and designing helical coiled springs for safe fatigue life

Springs are loaded by harmonic forces very often. High cycles fatigue damage and failure can be found during its service loading. This paper shortly describes stress concentration factor for helical springs on the inner diameter of the spring wire and its evaluation by using FE Method. These results...

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Bibliographic Details
Published in:Research in Agricultural Engineering (Praha) 2005-06, Vol.51 (2), p.50-55
Main Authors: Růžička, M., Doubrava, K.
Format: Article
Language:English
Subjects:
Fatigue failure
Fatigue life
fatigue of materials
Finite element method
Helical springs
High cycle fatigue
loading regimes
Materials fatigue
Prestressing
safe fatigue life
Safety factors
springs
Stress concentration
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Summary:Springs are loaded by harmonic forces very often. High cycles fatigue damage and failure can be found during its service loading. This paper shortly describes stress concentration factor for helical springs on the inner diameter of the spring wire and its evaluation by using FE Method. These results have been compared with correction functions published in the literature. The fatigue safety factor has been derived for three typical loading regimes of springs. All cases are demonstrated in the Haigh diagram. It has been showed that loading cases with constant operational prestress give lowest safety factor then the proportional or constant middle stress regimes.
ISSN:1212-9151
1805-9376
DOI:10.17221/4902-RAE