determination of reduced stresses due to extreme heating
determination of reduced stresses due to extreme heating
(OP)
Hi all..I'm trying to locate a good source of information and formulae for calculating the stresses on mild steel ofter being heated with a torch. The component is a clevis that had a frozen pin that had to be pressed out due to corrosion on the clevis.
Any information is considered helpful.
Regards and thanks in advance
Any information is considered helpful.
Regards and thanks in advance





RE: determination of reduced stresses due to extreme heating
ISZ
RE: determination of reduced stresses due to extreme heating
Rate of heating, start/end temperatures
Thickness of material
Material's thermal expansion/conductivity/etc
Constraint and geometry
There are many interdependencies, FEA may be the way forwards. Otherwise aim for minimising stresses by trying to heat slowly, uniformly and relaxing any restraint counteracting the natural expansion direction.
Hope that helps
RE: determination of reduced stresses due to extreme heating
Does this help?
RE: determination of reduced stresses due to extreme heating
if it was normalised/annealled i don't think you can affect the material properties by heating it the way it was done.
if it is high strength steel there is a chance (i think) that you've reduced the properties locally.
i think the key issue is not the stresses induced by heating but the effect this has on material properties, and how well the piece was supported when the bearing was removed (and how carefully this was done, ie not with a sledge).
RE: determination of reduced stresses due to extreme heating
RE: determination of reduced stresses due to extreme heating
Just replace BOTH and you can sleep tonight.
RE: determination of reduced stresses due to extreme heating
replace the pin, not many choices there !
RE: determination of reduced stresses due to extreme heating
RE: determination of reduced stresses due to extreme heating
"worried about capacity ... design capacity of the actuator (20,000lbs) ... certain that the clevis isn't seeing those kinds of loads in operation ... not an option at this point being that the system has to get on a boat next week ... The good part of this is that there are failsafes on the system so I'm not dealing with a single point of failure."
mmart, would you stand under it with 20,000 lbs on it?
RE: determination of reduced stresses due to extreme heating
RE: determination of reduced stresses due to extreme heating
20,000 lbs on a lug that you don't want to reduce by boring 2/32. Hmmm.
Why was oilite chosen?
These guys say The best bronze based ones aren't good much beyond 10,000 psi static load
http://www.oilitebearings.com/materials
The holes should be finished at the same time, in the same setup to maintain alignment so the pin can be assembled. Align-bore, align-reamed, or honed.
If there are oncerns over future corrosion or galling I bet the right anti-seize or assembly paste would work nicely, no machine work required
RE: determination of reduced stresses due to extreme heating
RE: determination of reduced stresses due to extreme heating
Assuming your loads etc are okay,I agree with earlier posts that if its just mild steel then the heat shouldn't be a problem, however your problem began with corrosion and I am wondering how the steel and bronze will sit in terms of
corrosion?.
regards
desertfox
RE: determination of reduced stresses due to extreme heating