Viscoelastic properties of plant cell walls. IV. Physical meaning of parameter K in mathematical formulation for stress-relaxation and load-extension processes

Abstract
When the function ϕ (K, A; B) is defined by the equation ϕ ( K , A ; B ) = B ( 1 + A B ) 1 + B − K A the stress-relaxation process at a fixed strain has been represented in the previous papers of this series as follows: S = b k · ln ϕ ( K , t p ; t +