Time-dependent viscoelastic properties along rat small intestine

Math 1 Math(A1).

Figure 1 Schematic diagram of wall thickness (w), inner diameter (d), and opening angle (q) for a ring radially cut into a sector.

Figure 2 Kelvin body, a mechanical model for a standard linear solid viscoelastic material. m1 and m0 are spring constants; h1 is a coefficient of viscosity; u is the displacement including u1 for dashpot and u1’ for spring; F is the sum of the force.

Math 2 Math(A1).

Math 3 Math(A1).

Math 4 Math(A1).

Math 5 Math(A1).

Figure 3 Changes of opening angle and normalized opening angle as function of time.

Figure 4 Experimental data and predicted data in rat 10.