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How to find out the elongation with FEA?

How to find out the elongation with FEA?

How to find out the elongation with FEA?

(OP)
Hello guys,

I'm permforming a FEA in a cast iron part. On the material specsheet has the information "elongation at fracture 15%" how can I find out this value in % on the part with FEA?

Thanks in advance!

RE: How to find out the elongation with FEA?

stress >>> strain >>> elongation (in fact elongation, as a %age, = strain, no?)

another day in paradise, or is paradise one day closer ?

RE: How to find out the elongation with FEA?

(OP)
Yes, I agree with you. So, my FEA got 0.00315 of strain, if specsheet shows 0.15 of strain (15%) at fracture, it means that it won't fracture? Disregard Yield Stress, for the moment.

RE: How to find out the elongation with FEA?

it would sound like you're well within the fracture strain. if so, you should be well within the material Ftu.

another day in paradise, or is paradise one day closer ?

RE: How to find out the elongation with FEA?

(OP)
Thank you guys, for the answers.

@rb1957
The stress is below to the Ultimate Tensile Strength, but above to the Yield Tensile Strength.

@GregLocock
Yes, non-linear region. I'm performing linear FEA and convert to non-linear stress by Neuber calculation.

I know that this part doesn't broke on field and have infinite life, but when I perform FEA I reach values above to the Yield Stress. I asked to the responsable engineer for this part, and he reached values greater than mine. I believe that if FEA doesn't reach "elongation at fracture 15%" it won't broke, due to be cast iron (GJS-400-15).

See attachment:

http://files.engineering.com/getfile.aspx?folder=5...

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