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Hi, I've been using the itk::fem framework to simulate soft tissue deformation for a vtkUnstructuredGrid model. I am using the SolverHyperbolic class and it works as far as applying external forces goes. My problem is that there is no "internal" force counteracting external forces. For example, if I apply a LoadGravConst to a beam with Boundary Conditions on its ends, then the middle continues to sag more and more every dTime. At no point does the fem model become stable. Furthermore, when any external forces are removed (such as LoadGravConst or LoadNode), then the model remains as it was and never returns to its original shape.<br><br>Changing material properties simply affects how great the displacement is for each dTime.<br><br>Am I missing something, doing something wrong, or is this simply not implemented (I know itk::fem framework is aimed at segmentation)?<br>
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Thanks,<br>
Ryan
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