Fatigue life of wire torsion springs
Fatigue life of wire torsion springs
(OP)
I am looking for info and methodology on calculating fatigue life of a Inconel X750 wire torsion spring. Does anyone have some suggestions or references.
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Fatigue life of wire torsion springs
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RE: Fatigue life of wire torsion springs
http://www.specialmetals.com/products/publication/tech_bulletin_x750.pdf
In general, for spring temper material (SAE AMS5699) at temperatures less than 260 C, the maximum stress should be kept below 690 MPa. This equates to ~ 45-55% of the ultimate tensile strength, depending on wire diameter. Some spring manufacturers use a more conservative 40% of UTS for the design stress.
Regarding methodology for analyzing fatigue life, I suggest investigating the Goodman method or a comparable fatigue life estimation method. The following link is an excellent paper that discusses the Goodman diagram:
http://www.read-eurowire.com/ist.htm
Also, there are numerous handbooks and guidelines available, such as these:
Compression, Extension, Torsion and Garter Springs
http://www.smihq.org/public/publications/encyclopedia.html#Anchor-Compressio-56695
Mechanical Springs by A.M.Wahl
http://www.smihq.org/public/pstorep.html#wahl
Advanced Spring Design Software Version 6 (ASD6)
http://www.smihq.org/public/pstores.html#asds6
Spring Design Manual
http://www.sae.org/servlets/productDetail?