Hi,
My model is a unit cell of a woven plain weave composite.
I am trying to plot the stress strain relationship to deduce the young's modulus of my specimen. I have simulated the abaqus model as a simple tension test by setting a displacement of U2=1 and boundary condition U2=0 at the other side.
From using the SUM function, I was able to find the total forces applied on the surface. Hence the stress is deduced as force applied / cross sectional area.
The question is, how do you obtain the strain? Is it the deformation displacement divided by the original length of the unit cell?
Hi, Alan!
Your definition of strain seems to be classic. But keep in mind that cross sectional area changes during simulation.
Bests,
Victor
Dear Alan,
You can take volume average of stress and strain in all the elements along the load direction (numerical homogenization). Modulus can be obtained by dividing average stress with average strain. Are you using elastic or elasto-plastic material? In case of elasto-plastic material, you can find variation in the effective modulus with respect to strain once the yield point is crossed.
You can also obtain complete stiffness tensor by simulating different cases. Refer chapter 6 of the book by EJ Barbero on FE of composite using abaqus.
Regards,
Chandrashekhar
Perhaps you can rely on Abaqus to provide S22 and E22 (check material orientations first!) values for you? Why recalculate when the software has done it for you?
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