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Endurance limit of Ti wire

Endurance limit of Ti wire

Endurance limit of Ti wire

(OP)
Can anyone give me an allowable fatigue stress for 3/8" diameter titanium spring wire?  I need 4 million cycles of life, which I am assuming is near the endurance limit.

I am trying to design a helical round wire spring which acts as both a torsional and compression spring. I am using the Von Mises critera.  Any help will be appreciated.

Thanks,
Ed

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