I am working on increasing the compliance of a hyper-elastic tube by cutting holes in it. I fit my material model to an ogden (n=3) strain-energy function using uniaxial tensile test from the lab. I am trying to recreate the stress/strain curve from the lab w/ two holes drilled through the middle of the tube. The tension of the tube is what is recorded in the lab tensile test. I am unable to see increased compliance of the tube no matter what I do.
I am having trouble figuring out which Output variables will give me the analogue of tension recorded in the lab. I originally thought that summing up the reaction forces (RF) on a nodal slice through the tube would give me the tension recorded in the lab. I see that the Reaction Forces are only calculated on the nodes where the displacement/load B.C. are applied. This makes it so there is no difference in reaction forces whether or not holes are present in the tube.
I also tried summing the Nodal Forces and Total Force (TF) over a nodal slice to give me the tension, and that didn't work either.
If anyone has an idea of a way to get my stress/strain curve of the tube w/ holes patterned into it to match the lab tensile test that would be great. I thought the easiest way to do it would be to get the tension in the tube (in abaqus) and divide by the engineering area to give the nominal stress of the tube.
Thanks A Lot,