Fig. 11.

Results for network Piola stress using the fixed solid volume fraction formulation. In this formulation, the number density of fibers varies as the solid volume concentration is held fixed, such that in a given volume there will be fewer but thicker fibers or more but thinner fibers to yield the same protein concentration. (a) Effect of estimated fiber length l on the final network Piola stress T_Rzz using five values of l from the most likely range of l from the probability distribution found in Kim et al. (2014), as discussed in Section 4.4. (b) Effect of final fiber radius R on final network Piola stress T_Rzz, for constant fiber length l = 0.5 μm. Thinner fibers contribute more network Piola stress T_Rzz. Since the solid volume fraction during polymerization is not constant, only the values calculated from the final time in the polymerization have been included. The final solid volume fraction for each of these points is ϕ_s = 0.01..