Fatigue life at high temperatures
Fatigue life at high temperatures
(OP)
The SN fatigue curves commonly quoted generally seem to apply at room temperatures. What is the effect of high temperatures (say about 400 C) on the fatigue life of an unwelded carbon steel component?
corus






RE: Fatigue life at high temperatures
Ciao.
RE: Fatigue life at high temperatures
corus
RE: Fatigue life at high temperatures
RE: Fatigue life at high temperatures
I've noticed in various software packages that they make a correction for temperature, but don't say how. In design standards on fatigue I've seen a correction for the change in Young's modulus at different temperatures, but not for yield strength with temperature. Do you have a reference for your suggestion of scaling for yield strength?
corus
RE: Fatigue life at high temperatures
RE: Fatigue life at high temperatures
If that is some serious business, go for lab tests otherwise consider special steels like fired pressure vessel quality steel for which some temperature related information is available in standards.
Ciao.
RE: Fatigue life at high temperatures
there is also a limited amount of data on the effect of high temperature exposure on Fty and Ftu, this is highly dependent on the duration. you could use this, like israelkk's suggestion, to reform your goodman diagram.
but i think fatigue testing at elevated temps is very difficult.