Nonlinear viscoelastic behaviour of canine arterial walls

摘要: The nonlinear viscoelastic behaviour of arterial walls subjected to large deformation is studied theoretically and experimentally. It assumed that the are thick-walled cylindrical vessels composed an incompressible, curvilinearly orthotropic material. radial displacement vessel simplified by superimposing a small time-dependent due pulse pressure on time-independent deformation. circumferential stresses expressed as functions histories strains in each direction. written terms series multiple integrals involving eight stress-relaxation functions. To determine these functions, experiments stress relaxation were performed with common carotid femoral arteries excised from mongrel dogs. For strain imposition within 1–100 s, power-law function time. On basis theoretical equations, diameter wall calculated time assuming sinusoidal intraluminal varying between 80 120 mm Hg applied lumen. creep phenomena shown be viscoelasticity walls. i.e. increases elapsed during fluctuations.