field variable dependency - hyperelastic material
field variable dependency - hyperelastic material
(OP)
I have been trying to assign field variable dependency for materials other than Marlow and running into issues. I have uniaxial tensile stress-strain data that I'd like to be able to scale with a field variable (from 0 to 1).
I guess I could scale it by "find and replace in place" using MATLAB or Python but I was hoping to avoid that.
It is a 3D model and the analysis is static.
I guess I could scale it by "find and replace in place" using MATLAB or Python but I was hoping to avoid that.
It is a 3D model and the analysis is static.
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RE: field variable dependency - hyperelastic material
What options do I have to scale the nonlinear stress-strain uniaxial tensile test data? Currently, I am doing the following:
*******************
*parameter
param=0.1
row1=0*param
row2=10*param
row3=20*param
..
..
..
*******************
Hyperelastic, ogden, test data input
*Uniaxial Test Data
<row1>,0
<row2>,0.5
<row3>,0.6
..
..
..
Also, just to be sure, isn't X-axis (direction 1) as defined in the orientation card assumed by ABAQUS to act as the primary axis of loading?
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RE: field variable dependency - hyperelastic material
RE: field variable dependency - hyperelastic material
Correct; I guess I am doing the same thing with a parameter definition except that in the approach you are suggesting all possible stress-strain curves are defined in the INP (intermediate ones being interpolated by ABAQUS) whereas in my current approach only one stress-strain law is defined for one value of the assigned parameter.
This sound problematic to me at first glace. I may have it wrong but I can't simply scale coefficients and expect a scaled non-linear relationship in uniaxial stress and strain out of a material model like Ogden, can I? I may have to do curve fits on a few possible curves, see how the parameters vary, and then, if possible, assign an appropriate profile to field variable dependency. What do you think?
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: field variable dependency - hyperelastic material