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Single-Element Uniaxial Test

Single-Element Uniaxial Test

Single-Element Uniaxial Test

(OP)
Hi all,

I have created a hyperelastic material in ABAQUS/Explicit using experimental data from a uniaxial tension test. When I use the "Evaluate Material" option in ABAQUS/CAE the material is found to be stable over the strain range and the predicted uniaxial nominal stress vs strain curve is in good comparison with my experimental data.

http://files.engineering.com/getfile.aspx?folder=938e37e4-59ef-471c-bef1-cef949a240c0&file=02.bmp

As a further evaluation I have set up a single-element (C3D8R) uniaxial tension test. There are many sample input files for single-element tests in the Verification Manual and I have set up my constraints as shown in these cases. I then use displacement control to simulate the tension test.

To calculate nominal stress from the results I have summed the reaction forces at the displaced nodes and divided by the original area of the element. To calculate the nominal strain I have divided the displacement at the displaced nodes by the original depth of the element. In both cases I have considered only the components in the direction of the displacement (RF3 and U3).

When I plot these results against the experimental data there is a small discrepency between the experimental and numerical plots that becomes more significant as strain increases.

http://files.engineering.com/getfile.aspx?folder=9b56d079-4840-4d97-9082-32bc7c86f87e&file=01.bmp

Have I missed something with my post-processing method? Any suggestions would be appreciated.

Thanks!
Dave

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