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View Full Version : Fatigue material data for Titanium Alloy (Ti-6AI-4V) !



kcoghlan
09-22-2009, 02:00 AM
Hello Shaban,

The terms you should use in your search for this information are
"endurance limit", "fatigue strength" or "fatigue limit"
http://en.wikipedia.org/wiki/Fatigue_limit
Also, you appear to have used the letter "i" instead of the letter "L"
in your abbreviation of Aluminum. Using an "L" as in "Ti-6AL-4V"
resulted in many more relevant hits in a Bing/Google search.

You'll find that the endurance limit (or fatigue limit) of most alloys
that have one (essentially steels and Titanium alloys) depends a lot
on the surface finish of the part. The finer & more perfect the
finish, the better the endurance. Any surface imperfections (cracks,
notches, threads, other stress raisers) will significantly decrease
the fatigue strength. So, it's hard to provide an exact answer for
your question.

That said, this data sheet has some numbers, but they appear to be
simply estimated based on UTS. So take caution in using these numbers
and note the warning at the bottom of the page:
http://www.tifab.com/pdf/Ti%20Grades%20summary.pdf

You may also find these papers useful:
http://www.astm.org/JOURNALS/JAI/PAGES/838.htm
http://journals.lww.com/spinejournal/pages/articleviewer.aspx?year=2003&issue=05010&article=00008&type=abstract

Hope this helps,
Kieran Coghlan, BSME, MSBME

2009/9/22 Shaban ALMOUAHED :
> Dear all,
>
>
> I am a Ph.D. student working in the field of orthopaedic instrumentation.
> I’m doing a fatigue stress analysis of an assembly made of Titanium Alloy
> (Ti-6AI-4V). So could anyone tell me, please, where I could find the
> stress-life data (Alternating Stress VS Life) for this material and thank
> you in advance.
>
>
> I would be so grateful for any information you could share with me.
>
>
>
> Brest regards,
> ------------------------------------------------
>
> Shaban ALMOUAHED - Doctorant
>
> Département Image et Traitement de l'Information
>
> TELECOM Bretagne / LATIM - INSERM U650
>
>
>
>
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