Nonlinear viscoelastic material property estimation for lower extremity residual limbs

Date

1999-12-01

Author

Tönük, Ergin

Metadata

Show full item record

Item Usage Stats

48
views

0
downloads

Human soft tissue is known to exhibit a nonlinear stress-strain relationship, as well as time dependent behavior such as creep and relaxation. The ability of computer models to simulate the response of lower extremity soft tissue loading is dependent on how well the tissue material properties approximate actual tissue behavior. Axisymmetric finite element models of residual limb soft tissue in the vicinity of an indentor test site were constructed to estimate parameters of a viscoelastic material formulation. A two-term Prony series viscoelastic material model approximates the relaxation and creep behavior of the lower extremity residual soft tissue in compression fairly well.

Subject Keywords

Biomechanics, Computer simulation, Finite element method, Strain, Stresses, Tissue

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0033341159&origin=inward
https://hdl.handle.net/11511/77304

Collections

Department of Mechanical Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Formulation and implementation of a fractional order viscoelastic material model into finite element software and material model parameter identification using in-vivo indenter experiments for soft biological tissues Demirci, Nagehan; Tönük, Ergin; Department of Mechanical Engineering (2012) Soft biological tissue material models in the literature are frequently limited to integer order constitutive relations where the order of differentiation of stress and/or strain is integer-valued. However, it has been demonstrated that fractional calculus theory applied in soft tissue material model formulation yields more accurate and reliable soft tissue material models. In this study, firstly a fractional order (where the order of differentation of stress in the constitutive relation is non-integer-valu...
Non-integer viscoelastic constitutive law to model soft biological tissues to in-vivo indentation Demirci, Nagehan; Tönük, Ergin (2014-01-01) Purpose: During the last decades, derivatives and integrals of non-integer orders are being more commonly used for the description of constitutive behavior of various viscoelastic materials including soft biological tissues. Compared to integer order constitutive relations, non-integer order viscoelastic material models of soft biological tissues are capable of capturing a wider range of viscoelastic behavior obtained from experiments. Although integer order models may yield comparably accurate results, non...
An extended eight-chain model for hyperelastic and finite viscoelastic response of rubberlike materials: Theory, experiments and numerical aspects Dal, Hüsnü; Açıkgöz, Kemal (Elsevier BV, 2020-12-01) Rubberlike materials exhibit strong rate-dependent mechanical response which manifests itself in creep and relaxation tests as well as in the hysteresis curves under cyclic loading. Unlike linear viscoelasticity, creep and relaxation response of rubber is nonlinear and amplitude-dependent. Within this context, the contribution of this work is three fold. (i) On the experimental side, the characterization of equilibrium and non-equilibrium responses are carried out by means of uniaxial and equibiaxial extens...
Nonlinear Finite Element Analysis Versus Ex Vivo Strain Gauge Measurements on Immediately Loaded Implants Eser, Atilim; AKÇA, KIVANÇ; Eckert, Steven; Cehreli, Murat Cavit (2009-05-01) Purpose: To evaluate the level of agreement between nonlinear finite element stress analysis (NL-FEA) and ex vivo strain gauge analysis (EV-SGA) on immediately loaded implants. Materials and Methods: Four 4.1-mm-diameter, 12-mm-long implants were placed bilaterally into the lateral and first premolar regions of completely edentulous maxillae of four human cadavers. Two-element 90-degree rosette strain gauges were bonded to the labial cortical bone around the implants, and 100 N maximal load was applied over...
Generalized finitedifference method in elastodynamics using perfectly matched layer Korkut, Fuat; Tokdemir, Turgut; Department of Engineering Sciences (2012) This study deals with the use of the generalized finite difference method (GFDM) in perfectly matched layer (PML) analysis of the problems in wave mechanics, in particular, in elastodynamics. It is known that PML plays the role of an absorbing layer, for an unbounded domain, eliminating reflections of waves for all directions of incidence and frequencies. The study is initiated for purpose of detecting any possible advantages of using GFDM in PML analysis: GFDM is a meshless method suitable for any geometry...

Citation Formats

E. Tönük, “Nonlinear viscoelastic material property estimation for lower extremity residual limbs,” Atlanta, GA, USA, 1999, vol. 1, p. 645, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0033341159&origin=inward.