Figure 2From: Visco-hyperelastic constitutive modeling of soft tissues based on short and long-term internal variables The model fit for the stress relaxation of anterior cruciate ligament at 16% stretch. The experimental data were reproduced from the literature [36]. The stress was normalized to the peak stress obtained at the end of ramp loading. A rapid but continuous stress reduction is seen during early relaxation. These data were used to characterize the relaxation parameters, τ i and w i , in Table 1.Back to article page