Recurring Meeting of Cleveland Clinic - University of Utah

Date: April 23, 2014

Time: 3:00 PM EST

Means: Conference call

Attendees:

1. Ahmet Erdemir
2. Jason Halloran
3. Jeff Weiss
4. Steve Maas

Agenda:

1. Progress on in situ strain test problem.

   • http://wiki.simtk.org/openknee/Febio/InSituStrain

2. Update on local coordinate systems and connector elements.

   • http://wiki.simtk.org/openknee/Febio/RigidBodyMotions

3. Update on set definitions in FEBio input and output.

   • http://wiki.simtk.org/openknee/Febio/SetDefinitions

4. FEBio solution repeatability.
5. Decide action items for next meeting.
6. Other.

Immediate Action Items:

• Cleveland Clinic (TBD)
  • TBD
• University of Utah (TBD)
  • TBD

Notes:

1. Progress on in situ strain test problem.
   • Steve extended the capability for multidirectional prescription of in situ strain. The feature now works with any number of fiber directions. He submitted an abstract to CMBBE 2014, with Jeff, Ahmet, and Jason as co-authors. A copy of the abstract will be sent to the Cleveland Clinic team.
   • Steve noted that current formulation is uncoupled and accommodates residual strains in the deviatoric components not in the volumetric components. As a result when pre-strain is applied a deformation of the structure is observed. Ideally, when material, geometry and boundary conditions are compatible, no deformation should be observed. To address this issue, Steve will reimplement this feature for coupled constitutive formulation, test, and then move on to the uncoupled formulation with the an updated approach. Adaption of the iterative correction of the applied in situ strain is a novel feature when compared to previous literature. Steve will update the wiki to reflect these discussions.
2. Update on local coordinate systems and connector elements.
   • TBD
3. Update on set definitions in FEBio input and output.
   • TBD
4. FEBio solution repeatability.
   • TBD
5. Decide action items for next meeting.
   • TBD
6. Other.
   • TBD