Tension-Compression Behavior
Tension-Compression Behavior
(OP)
Hi,
I am trying to simulate a plastic with a hyperelastic model.
Input: Uniaxial test data
Output 1: stress-strain curve under tension
Output 2: stress-strain curve under compression
When I compare these two curves, I have different behavior. does anyone know what can be the cause of this difference?
regards
I am trying to simulate a plastic with a hyperelastic model.
Input: Uniaxial test data
Output 1: stress-strain curve under tension
Output 2: stress-strain curve under compression
When I compare these two curves, I have different behavior. does anyone know what can be the cause of this difference?
regards





RE: Tension-Compression Behavior
RE: Tension-Compression Behavior
Red line is under tension
Blue one is under compression
In order to make it easy, I put compression into the first quarter of the coordinate system.
RE: Tension-Compression Behavior
Your tension specimen probably yielded locally and then ultimately failed in net section failure. Your compression sample probably failed in buckling, but that is purely a guess.
Use the curve that is appropriate for your anticipated failure mode...time to be an engineer
RE: Tension-Compression Behavior
Actually, I could understand it if it was from experiment. What I do not understand is how simulation generates this.
RE: Tension-Compression Behavior
What software are you using and what "hyperelastic" model does it follow? Learn the "black box" and you will understand how the software uses this information to perform its calculations.
RE: Tension-Compression Behavior
Is delongation a word and the right word?
-- MechEng2005
RE: Tension-Compression Behavior
RE: Tension-Compression Behavior
I think it requires the model to be based on solids but then it should work just as described in the results.
Regards
Thomas
RE: Tension-Compression Behavior
I do not have any stress vs. strain data for compression(from experiment), and I do not know the behavior of the material under compression.
obviously, it is implemented in the model that way. Thanks for this valuable answers.