NDLI: The Assumption of a Negligible Preload on the Determination of Viscoelastic Properties Based on the Quasi-linear Viscoelastic (QLV) Theory

Content Provider	IEEE Xplore Digital Library
Author	Xiaoyan Zhang Fisher, M.B. Woo, S.L.-Y. Guotai Jiang Abramowitch, S.D.
Copyright Year	2007
Description	Author affiliation: Tongji Univ., Shanghai (Xiaoyan Zhang)
Abstract	When performing a stress-relaxation test of soft tissues, a small preload is usually applied to the specimen to remove slack and provide a gauge length. This preload is generally assumed to be negligible. However, for tissues with a low stiffness, such as healing ligaments and tendons, the preload, which corresponds to a prestress, may be a significant percentage of its peak stress. In this study, the effects of such an assumption on the parameters describing the viscoelastic behavior of soft tissue based on the quasi-linear viscoelastic (QLV) theory were evaluated. Simulated data were generated by inputting a single set of constants into the QLV theory and adjusting the strain rate. With the ramp time held constant, seven different strain rates were inputted to yield data sets with 7 different peak stresses. A prestress of 0.5 MPa was applied to each data set. Two different approaches were then utilized to curve-fit the simulated data to determine the values of the inputted constants -I) a strain history approach which does not account for the preload, and 2) a preload approach which includes a modification to the strain history approach to account for the preload. The constants determined by both approaches were compared with the inputted values and the percent error reflected the bias caused by assuming a negligible preload. In the strain history approach, the preload had a significant effect on the estimation of the viscoelastic properties when the ratio of prestress caused by preload to peak stress is higher than 0.01. However, the modification made in the preload approach improved the estimation providing an accurate determination, i.e. within 10%, of the inputted constants for all data sets. The results suggest that the preload should be to taken into account when charactering the viscoelastic behavior of tissues with a low stiffness and that the preload approach presented in this study provides an accurate estimate of the constants describing the QLV theory.
Starting Page	1617
Ending Page	1620
File Size	278991
Page Count	4
File Format	PDF
ISBN	9781424410774
DOI	10.1109/ICCME.2007.4382020
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-05-23
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Viscosity Performance evaluation Biological tissues Elasticity Capacitive sensors History Ligaments Stress Testing Tendons
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in