Mechanical Fatigue of A321 SS
Mechanical Fatigue of A321 SS
(OP)
Hey folks,
Just a question regarding the properties of A321 stainless. I'm a structural engineer by trade, and am not too familiar with more exotic material properties and would appreciate a little direction.
I've been doing some looking online for A321 properties, and have found some consensus, but would appreciate a nod from the folks that know - I hate taking stuff from online at face value.
It seems to say online that the fatigue endurance limit for A321 is approximately 35% of the tensile strength. For my application, the operating temperature is about 550 degrees Celsius, and service time is about 100,000 hours.
So the properties that I am currently working with are:
yield strength = 150-190 MPa
Ult Tensile Str = 360-390 MPa
Endurance Limit = 0.35*360 = 125 MPa <- this number seems kind of high?
I know it seems to be tough to nail down some good figures, but I am selecting design values which are very conservative with respect to the numbers listed above, and would just like to get a nice warm fuzzy feeling that the final numbers that I've selected have an ample buffer of safety/uncertainty.
thanks
DRW
Just a question regarding the properties of A321 stainless. I'm a structural engineer by trade, and am not too familiar with more exotic material properties and would appreciate a little direction.
I've been doing some looking online for A321 properties, and have found some consensus, but would appreciate a nod from the folks that know - I hate taking stuff from online at face value.
It seems to say online that the fatigue endurance limit for A321 is approximately 35% of the tensile strength. For my application, the operating temperature is about 550 degrees Celsius, and service time is about 100,000 hours.
So the properties that I am currently working with are:
yield strength = 150-190 MPa
Ult Tensile Str = 360-390 MPa
Endurance Limit = 0.35*360 = 125 MPa <- this number seems kind of high?
I know it seems to be tough to nail down some good figures, but I am selecting design values which are very conservative with respect to the numbers listed above, and would just like to get a nice warm fuzzy feeling that the final numbers that I've selected have an ample buffer of safety/uncertainty.
thanks
DRW





RE: Mechanical Fatigue of A321 SS
Then you need strengths at 550C to work with.
Are you really looking for fatigue, or is creap and stress rupture the more important.
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RE: Mechanical Fatigue of A321 SS
My primary concern was fatigue due to fairly low loading (about 10MPa stress), but relatively high cycles (1-2,000,000,000 estimated cycles).