An attempt was made to consider two viscoelastic properties: the increase in tissue deformation over time with a constant load (creep) and the decrease in load with time at a constant tissue elongation (stress relaxation). The hypothesis was that nonlinear viscoelasticity of ligament requires a description more general than the separable quasilinear viscoeleasticity (QLV) formulation commonly used. This hypothesis was tested via creep and relaxation experiments performed at multiple levels in the physiologic region of recoverable loading.
Bibliographical noteFunding Information:
This work was thankfully funded in part by NSF Grant No. CMS-9907977, NASA Grant No. NAG9-1152, and the University of Wisconsin–Madison Graduate School. The authors thank Dennis Heisey for assistance with statistical analysis.
- Creep, ligament
- Quasilinear viscoelasticity (QLV)
- Stress relaxation