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Coupled cellular electromechanics and distributed finite elasticity

These examples use coupled electro-mechanical cellular models to generate the
active fibre tension component for use in
ZCTG5A, as part of the general finite elastic deformation of the tissue. The
finite element strains are then used to compute the new extension ratios at
each of the grid points (*"cells"*).

The procedure used goes something like this...

- Define the model geometry, fibres, etc;
- Define the continuum/distributed mechanics equations, material
parameters, solution method, etc;
- Define the cellular model, material parameters, solution method,
etc;
- Time loop:
- Compute the cellular extension ratios from the continuum
strains/geometry;
- Solve the cellular model for the current time step;
- Compute the active fibre tension component of the tension tensor at
each gauss point from the grid points;
- Solve the continuum mechanics for the current time step.

This is very simplified - if you are interested in the full algorithm, you'll
need to carefully try and pick through the examples contained here.
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Current problems with this technique

So far, including the fading memory equations of the HMT model leads to severe
instability in the solution. This has been avoided by simply using the
*isometric tension* generated at each of the cells - i.e., treating each
of the cellular time steps as a semi steady state problem.

Examples are:

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