Environmental modification factor fe in fatigue analysis
Environmental modification factor fe in fatigue analysis
(OP)
Hi,
I am doing a fatigue analysis and I was having questions regarding the environmental modification factor fe (as per ASME Section VIII, div 2, art 3.F.2.2.c). Note that this vessel is div 1, so I don’t have a user's design specification from the client specifying this factor.
The code says "A value of fe= 4.0 shall be used unless there is specific information to justify an alternate value based on the severity of the material/environmental interaction."
Does anyone know how and based on what this value can be changed? Is there some guidelines to define this factor?
Thanks,
Biss
I am doing a fatigue analysis and I was having questions regarding the environmental modification factor fe (as per ASME Section VIII, div 2, art 3.F.2.2.c). Note that this vessel is div 1, so I don’t have a user's design specification from the client specifying this factor.
The code says "A value of fe= 4.0 shall be used unless there is specific information to justify an alternate value based on the severity of the material/environmental interaction."
Does anyone know how and based on what this value can be changed? Is there some guidelines to define this factor?
Thanks,
Biss





RE: Environmental modification factor fe in fatigue analysis
What is your "environment"? Are you in a high-cycle regime or low-cycle? Is there the potential for stress corrosion cracking? How about hydrogen-induced cracking? At the location of interest, can there be a passivation layer? Could such a passivation layer be eroded by the flow?