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Input Stress Vs Strain data from tensile test Experiment in to CAE.

Input Stress Vs Strain data from tensile test Experiment in to CAE.

Input Stress Vs Strain data from tensile test Experiment in to CAE.

(OP)
     I have True-Stress vs True-Strain data from tensile test experiments. this data has more than thousand points(x,y) to totally define the stress-strain curve starting with the initial linear elastic response followd by plasticity (hardening) till necking.

Now the questions are

(1) Do i need to input all this data in to the plasticity model availabe in CAE or just the data starting from non linear response?
(2) Is there a way to import this data (from excel or text file) if i neeed to input all the points ?
(3) Can i define this curve by picking a few points (about 20) so that the shape of the curve is still close?

Any help is geatly appreciated.

Thanks,
Nodal

RE: Input Stress Vs Strain data from tensile test Experiment in to CAE.

Typical approachs consist of a bilinear or trilinear model, meaning two or the linear lines to approximate the curve.  

You can put it as many data points as you like, but going beyond a trilinear model proabaly won't affect the result too much.  In short, I would just make a piecewise linear model that best fits the data.  I can't answer how many lines that you feel are adequate to approximate your curve, but if you are using more than a handful you are probably just wasting time. The raw data from the test is just that, raw.  It's up to you to digest it for FEM use.  

Brian
www.espcomposites.com

RE: Input Stress Vs Strain data from tensile test Experiment in to CAE.

(OP)
Thanks much brian.  

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