boing
2006-01-16, 04:57
Hi everyone
I'm simulating the behaviour of small tubes made of PTFE exposed to bending (in ABAQUS), the tubes are bend until the ends touches one another. The objective is to investigate potential kink of the cross section. I have tensile test data for the tubes, the data is significantly different than those given in your article Jörgen. I guess this is due to the small dimension of the tube, different crystalinity resulting from the manufacturing proces. I have modelled the tubes using the classic metal plasticity. This may sound crazy, but I think it can be justified by the uniaxial stress state (pure bending) and the fact that no unloading occurs.
But no I planned to simulate the behaviour of the tubes with a more complex loading, and therefore I would like to use a better material model. I considered using one of the Hyperelastic material models, but which one? The ones that I have tried goes unstable in the compression zone (I only have data for tensile test), how can they be stabilized? Is it feasible to assume that PTFE behaves similar in compression, and therefore put a minus in front of the data from the tensile test and use those in ABAQUS to calibrate the model. Can anyone suggest which of the build in material model in ABAQUS is most suitable?
Thanks in advance.
Kind regards
I'm simulating the behaviour of small tubes made of PTFE exposed to bending (in ABAQUS), the tubes are bend until the ends touches one another. The objective is to investigate potential kink of the cross section. I have tensile test data for the tubes, the data is significantly different than those given in your article Jörgen. I guess this is due to the small dimension of the tube, different crystalinity resulting from the manufacturing proces. I have modelled the tubes using the classic metal plasticity. This may sound crazy, but I think it can be justified by the uniaxial stress state (pure bending) and the fact that no unloading occurs.
But no I planned to simulate the behaviour of the tubes with a more complex loading, and therefore I would like to use a better material model. I considered using one of the Hyperelastic material models, but which one? The ones that I have tried goes unstable in the compression zone (I only have data for tensile test), how can they be stabilized? Is it feasible to assume that PTFE behaves similar in compression, and therefore put a minus in front of the data from the tensile test and use those in ABAQUS to calibrate the model. Can anyone suggest which of the build in material model in ABAQUS is most suitable?
Thanks in advance.
Kind regards