TY - JOUR
T1 - Modeling of the transient responses of the vocal fold lamina propria
AU - Zhang, Kai
AU - Siegmund, Thomas
AU - Chan, Roger W.
N1 - Funding Information:
This work was supported by the National Institute on Deafness and Other Communication Disorders, NIH grant no. R01 DC006101.
PY - 2009/1
Y1 - 2009/1
N2 - The human voice is produced by flow-induced self-sustained oscillation of the vocal fold lamina propria. The mechanical properties of vocal fold tissues are important for understanding phonation, including the time-dependent and transient changes in fundamental frequency (F0). Cyclic uniaxial tensile tests were conducted on a group of specimens of the vocal fold lamina propria, including the superficial layer (vocal fold cover) (5 male, 5 female) and the deeper layers (vocal ligament) (6 male, 6 female). Results showed that the vocal fold lamina propria, like many other soft tissues, exhibits both elastic and viscous behavior. Specifically, the transient mechanical responses of cyclic stress relaxation and creep were observed. A three-network constitutive model composed of a hyperelastic equilibrium network in parallel with two viscoplastic time-dependent networks proves effective in characterizing the cyclic stress relaxation and creep behavior. For male vocal folds at a stretch of 1.4, significantly higher peak stress was found in the vocal ligament than in the vocal fold cover. Also, the male vocal ligament was significantly stiffer than the female vocal ligament. Our findings may help explain the mechanisms of some widely observed transient phenomena in F0 regulation during phonation, such as the global declination in F0 during the production of declarative sentences, and local F0 changes such as overshoot and undershoot.
AB - The human voice is produced by flow-induced self-sustained oscillation of the vocal fold lamina propria. The mechanical properties of vocal fold tissues are important for understanding phonation, including the time-dependent and transient changes in fundamental frequency (F0). Cyclic uniaxial tensile tests were conducted on a group of specimens of the vocal fold lamina propria, including the superficial layer (vocal fold cover) (5 male, 5 female) and the deeper layers (vocal ligament) (6 male, 6 female). Results showed that the vocal fold lamina propria, like many other soft tissues, exhibits both elastic and viscous behavior. Specifically, the transient mechanical responses of cyclic stress relaxation and creep were observed. A three-network constitutive model composed of a hyperelastic equilibrium network in parallel with two viscoplastic time-dependent networks proves effective in characterizing the cyclic stress relaxation and creep behavior. For male vocal folds at a stretch of 1.4, significantly higher peak stress was found in the vocal ligament than in the vocal fold cover. Also, the male vocal ligament was significantly stiffer than the female vocal ligament. Our findings may help explain the mechanisms of some widely observed transient phenomena in F0 regulation during phonation, such as the global declination in F0 during the production of declarative sentences, and local F0 changes such as overshoot and undershoot.
UR - http://www.scopus.com/inward/record.url?scp=55249103390&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=55249103390&partnerID=8YFLogxK
U2 - 10.1016/j.jmbbm.2008.05.005
DO - 10.1016/j.jmbbm.2008.05.005
M3 - Article
C2 - 19122858
AN - SCOPUS:55249103390
SN - 1751-6161
VL - 2
SP - 93
EP - 104
JO - Journal of the Mechanical Behavior of Biomedical Materials
JF - Journal of the Mechanical Behavior of Biomedical Materials
IS - 1
ER -