April 10, 2023 at 6:53 pmBenhour AmirianSubscriber
I was wondering if you could help me how to import stress strain curve for material definition in dyna. I am trying to use that for defining composite material.
April 11, 2023 at 5:31 pmReno GenestAnsys Employee
Which material model are you using? Which software are you using to create the model?
April 13, 2023 at 5:09 pmBenhour AmirianSubscriber
Thanks for your reply. I am new to LS-Dyna.
I am using LS-Prepost for creating the model and I need to simulate a simple 2D model under uniaxial tensile loading. Suppose that I am using a linear elastic model.
April 13, 2023 at 6:02 pmReno GenestAnsys Employee
If you are using a linear elastic model (*MAT_001 in LS-DYNA), you don't need stress-strain curves. Only density, young's modulus, and Poisson's ratio.
Importing a stress-strain curve makes sense for a material model with plasticity such as *MAT_024 (for modelling metals).
April 13, 2023 at 6:37 pmBenhour AmirianSubscriber
Thanks Reno for your quick response.
Actually, I need to mdel a single element composite matrial, which I believe I need to use MAT_052. Besides, suppose that I am creating a model for MAT_024. What is the approach for importing the stress-strain curve?
I appreciate your help.
April 14, 2023 at 9:41 pmAndreas KoutrasAnsys Employee
Are you referring to MAT_054, which is a popular material for modeling composites? MAT_054 does not support direct use of stress-strain data. Instead you can determine the material constants based on your data.
In MAT_024, LCSS is used to define stress-strain data in terms of effective stress -vs- effective plastic strain. When LCSS references a load curve, the curve of the stress-strain data is defined with *DEFINE_CURVE. Further details are shown in the section of MAT_024 in Manual Vol II https://lsdyna.ansys.com/manuals/
Some examples are available here:
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