low creep aluminum
low creep aluminum
(OP)
We are constructing high precision parallel spring flexure structures by EDM machining of aluminum parts and we have problems with creep effects of the final structures. Could anyboby tell me which aluminum alloy should we employ for lowest creep? Where may I find such data?





RE: low creep aluminum
2024-T6 is often employed for low capacity sensors.
There's couple charts for microyield behavior of of this alloy I could provide if you interested.
What kind of alloys have you tried so far?
Also if you find any other good references, please let me know.
Thanks,
Mark
RE: low creep aluminum
Are you certain that creep is the problem? Springs often have problems with high stresses near the limits of the intended travel, which can result in yielding. Creep is associated with elevated temperatures, so what is the temperature range of this design? Is the flexure essentially a cantilever beam with fully reversed loading? Reiterating Mark's previous question, what alloys have you used so far?
RE: low creep aluminum
Citation:
Creep resistant aluminium alloys and their applications
Robinson J.S.; Cudd R.L.; Evans J.T.
Materials Science and Technology, 1 February 2003, vol. 19, no. 2, pp. 143-155(13), Institute of Materials.
Regards
David.
RE: low creep aluminum
RE: low creep aluminum
MIL-HDBK-5H
http://www.grantadesign.com/MILpdfs/MIL5-H/MIL5H-3-7-4.pdf
Atlas of Creep and Stress-Rupture Curves
http://www.asminternational.org/Template.cfm?Section=BrowsebyTopic&template=Ecommerce/ProductDisplay.cfm&ProductID=10554
2. It doesn't sound as if your application involves creep-- time-dependent strain based on the application of a static force. I would recommend investigating the structure design & geometry, as there may be a problem with fixity/constraint, stresses, etc.