Ultrasonic biopolymer characterisation by hysteresis quantification

0483323 - ÚT 2018 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Zatloukalová, Jana - Tokar, Daniel - Kopecká, Karolína - Převorovský, Zdeněk
Ultrasonic biopolymer characterisation by hysteresis quantification.
NDT in PROGRESS. Praha: Institute of Thermomechanics AS CR, v .v. i., 2017 - (Převorovský, Z.), s. 109-117. ISBN 978-80-87012-63-5.
[International Workshop of NDT Experts /9./. Praha (CZ), 09.10.2017-11.10.2017]
Grant CEP: GA ČR GA17-22615S
Institucionální podpora: RVO:61388998
Klíčová slova: hysteresis * ultrasound * biopolymers
Obor OECD: Acoustics

Nonlinear characteristics are advanced indicators of the structure of viscoelastic materials. In this contribution, we focus on biopolymers (such as articular cartilage and skin tissue), and their typical amount of energy lost by mechanical loading/unloading represented by a hysteresis curve. For hysteresis modeling we use the PreisachMayergoyz space model, and restricted power distribution (Guyer extended distribution). Besides the power distribution parameters, the stress protocol is required as an input to obtain the modeled hysteresis curve, and to compare with experimental results. Knowing the experimental curve, an iterative numerical procedure for identification of true density function of opening and closing pressures was applied, and an optimization algorithm sought for the best (characteristic) distribution parameters for the specific soft tissue. Material properties can be evaluated based on the described quantification, and potentially used for medical purposes and healing or cosmetics treatment evaluation.
Trvalý link: http://hdl.handle.net/11104/0279213