Before revision:  Stability results are developed for both the continuous and (semi-) discrete problems. For the mechanical part, we distinguish between elasticity and plasticity. We perform numerical validation to these constraints and provide a biological interpretation of the (in)stability.
After revision:  Stability results are developed for both the continuous and (semi-) discrete problem. We show that the truncation error between these eigenvalues associated with the continuous and semi-discrete problem is of order \mathcal{O perform numerical validation to these constraints and provide a biological interpretation of the (in)stability.