Viscoelastic and failure properties of spine ligament collagen fascicles.
The microstructural volume fractions, orientations, and interactions among components vary widely for different ligament types. If these variations are understood, however, it is conceivable to develop a general ligament model that is based on microstructural properties. This paper presents a part of a much larger effort needed to develop such a model. Viscoelastic and failure properties of porcine posterior longitudinal ligament (PLL) collagen fascicles were determined. A series of subfailure and failure tests were performed at fast and slow strain rates on isolated collagen fascicles from porcine lumbar spine PLLs. A finite strain quasi-linear viscoelastic model was used to fit the fascicle experimental data. There was a significant strain rate effect in fascicle failure strain (P < 0.05), but not in failure force or failure stress. The corresponding average fast-rate and slow-rate failure strains were 0.098 ± 0.062 and 0.209 ± 0.081. The average failure force for combined fast and slow rates was 2.25 ± 1.17 N. The viscoelastic and failure properties in this paper were used to develop a microstructural ligament failure model that will be published in a subsequent paper.
Lucas
Scott R
SR
Exponent Failure Analysis Associates, Biomechanics Practice, 3401 Market Street, Suite 300, Philadelphia, PA 19104, USA. slucas@exponent.com
Bass
Cameron R
CR
Crandall
Jeff R
JR
Kent
Richard W
RW
Shen
Francis H
FH
Salzar
Robert S
RS
D000818:Animals; D001696:Biomechanical Phenomena; D003094:Collagen / Q000737:chemistry*; D003198:Computer Simulation; D004548:Elasticity; D004867:Equipment Design; D020342:Finite Element Analysis; D008022:Ligaments / Q000473:pathology / Q000503:physiopathology; D008023:Ligaments, Articular / Q000503:physiopathology; D017846:Longitudinal Ligaments / Q000293:injuries / Q000503:physiopathology*; D015233:Models, Statistical; D015203:Reproducibility of Results; D013131:Spine / Q000503:physiopathology*; D013314:Stress, Mechanical; D013552:Swine; D013718:Tensile Strength; D013997:Time Factors; D014783:Viscosity
D003094:Collagen