View Full Version : S - N Curve for Cold Drawn Seamless
Alexisonsmith
05-20-2010, 02:31 PM
Hey Does anyone know where I can get the S- N curve for Cold Drawn Seamless on the internet, I do not have the time to contact the manufacturer I need it asap ,
Thanks,
Alexisonsmith
05-20-2010, 02:31 PM
Hey Does anyone know where I can get the S- N curve for Cold Drawn Seamless on the internet, I do not have the time to contact the manufacturer I need it asap ,
Thanks,
exFSAE
05-20-2010, 02:39 PM
What alloy? What temper?
Alexisonsmith
05-20-2010, 02:45 PM
Just normal CDS, it is just to get a rough idea of an anlysis
exFSAE
05-20-2010, 03:46 PM
Check your textbooks... mine had some S-N curves I believe.
Hector
05-20-2010, 06:15 PM
Your library will have this information.
vandit
05-21-2010, 05:19 AM
@ Alexisonsmith, can you be little specific as to which material you are interested in. Cold Drawn Seamless or CDS is a manufacturing process.
in any case, you should google 'Atlas of fatigue curves'(not posting the link, as it sometimes takes time to get approved).
There is a google book version of this and there are thousands of S-N curves. On a quick look in index section 2 will be of your interest.
Adambomb
05-21-2010, 12:03 PM
If you dig through the materials tables in Solidworks Simulation I believe they have S-N curves. Otherwise I've normally used textbook values.
Alexisonsmith
05-22-2010, 12:41 AM
Thanks that ia great help
Alexisonsmith
05-24-2010, 11:41 PM
So I have looked in the Atlas of fatigue curves however there is no S-N curve for CDS steel tubing. Also there is nothing in the solidworks simulation package. Could I just use a mild strength steel to have an idea of the fatigue characteristics?
Alexisonsmith
fixitmattman
05-25-2010, 09:36 AM
Of course there isn't going to be a 'S-N curve for CDS tubing.' You need to calculate it yourself using the base material curve, loading conditions, and various other modifying factors. This is a 20 min calculation if you have the shigley text, or any other text with a half decent section on fatigue.
Alexisonsmith
05-25-2010, 01:10 PM
So If I use say a medium strength S-N curve and then use the basic loading conditions etc? Could you reccomend a book?
Alexisonsmith
Demon Of Speed
06-08-2010, 11:55 AM
"Shigley's Mechanical Engineering Design" page 280-285 or so.
For our control arms (with the loading conditions, material, finish, size, temp, reliability, welding, etc. that we wanted/had) if made from 1018 steel was around 13ksi, and 4130 steel was around 22 ksi, for example. As you can see that is around 0.2-0.3 of the ultimate strength. A rule of thumb for infinite fatigue life is 1/3 of the yield strength.
see h t t p : / / f s a e . c o m /eve/forums/a/tpc/f/125607348/m/509108474?r=610107284#610107284
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