Estimation of model errors in the calibration of viscoelastic material models

2008 ◽  
Vol 76 (10) ◽  
pp. 1568-1582 ◽  
Author(s):  
Håkan Johansson ◽  
Fredrik Larsson ◽  
Kenneth Runesson
Keyword(s):  
Viscoelastic Material ◽  
Model Errors ◽  
Material Models

scholarly journals FE Prediction of Hysteretic Component of Rubber Friction

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
L. Pálfi ◽  
T. Goda ◽  
K. Váradi ◽  
E. Garbayo ◽  
J. M. Bielsa ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Storage Modulus ◽  
Viscoelastic Material ◽  
Loss Factor ◽  
Master Curve ◽  
Reaction Force ◽  
Maxwell Model ◽  
Material Models ◽  
Rubber Friction ◽  
Maxwell Models

The hysteretic part of the friction coefficient for rubber sliding on an ideal rigid, rough surface has been investigated by FE technique. The FE models were created by using two different FE softwares, ABAQUS and MSC.MARC. The surface roughness has been considered by using two different sine waves having a wavelength of 100 μm and 11.11 μm, as well as their superposition. Parameters of the viscoelastic material models of the rubber were gained, firstly from a fit to the measured storage modulus, secondly from a fit to the measured loss factor master curve of the rubber. The effect of viscoelastic material models, comparing 10-term and 40-term generalized Maxwell models was also considered together with the temperature effect between −50 and150°C. According to the results, both postprocessing methods, namely, the reaction force and the energy-based approach, show very similar coefficients of friction. The 40-term Maxwell model fitted to both the storage modulus and loss factor curve provided the most realistic results. The tendency of the FE results has been explained by semianalytical theory.

Rheological representation of fractional order viscoelastic material models

2010 ◽  
Vol 49 (4) ◽  
pp. 381-400 ◽  
Author(s):  
Katerina D. Papoulia ◽  
Vassilis P. Panoskaltsis ◽  
Nishu V. Kurup ◽  
Igor Korovajchuk
Keyword(s):  
Fractional Order ◽  
Viscoelastic Material ◽  
Material Models

On the numerical handling of fractional viscoelastic material models in a FE analysis

2012 ◽  
Vol 51 (6) ◽  
pp. 999-1012 ◽  
Author(s):  
Sebastian Müller ◽  
Markus Kästner ◽  
Jörg Brummund ◽  
Volker Ulbricht
Keyword(s):  
Viscoelastic Material ◽  
Fe Analysis ◽  
Material Models

scholarly journals Viscoelastic material models for more accurate polyethylene wear estimation

2018 ◽  
Vol 53 (5) ◽  
pp. 302-312 ◽  
Author(s):  
Gioacchino Alotta ◽  
Olga Barrera ◽  
Elise C Pegg
Keyword(s):  
Molecular Weight ◽  
Finite Element ◽  
Viscoelastic Material ◽  
Polyethylene Wear ◽  
Material Model ◽  
Elastoplastic Material ◽  
Material Behaviour ◽  
Material Models ◽  
Ultra High Molecular Weight ◽  
Implant Wear

Wear debris from ultra-high-molecular-weight polyethylene components used for joint replacement prostheses can cause significant clinical complications, and it is essential to be able to predict implant wear accurately in vitro to prevent unsafe implant designs continuing to clinical trials. The established method to predict wear is simulator testing, but the significant equipment costs, experimental time and equipment availability can be prohibitive. It is possible to predict implant wear using finite element methods, though those reported in the literature simplify the material behaviour of polyethylene and typically use linear or elastoplastic material models. Such models cannot represent the creep or viscoelastic material behaviour and may introduce significant error. However, the magnitude of this error and the importance of this simplification have never been determined. This study compares the volume of predicted wear from a standard elastoplastic model, to a fractional viscoelastic material model. Both models have been fitted to the experimental data. Standard tensile tests in accordance with ISO 527-3 and tensile creep recovery tests were performed to experimentally characterise both (a) the elastoplastic parameters and (b) creep and relaxation behaviour of the ultra-high molecular weight polyethylene. Digital image correlation technique was used in order to measure the strain field. The predicted wear with the two material models was compared for a finite element model of a mobile-bearing unicompartmental knee replacement, and wear predictions were made using Archard’s law. The fractional viscoelastic material model predicted almost ten times as much wear compared to the elastoplastic material representation. This work quantifies, for the first time, the error introduced by use of a simplified material model in polyethylene wear predictions, and shows the importance of representing the viscoelastic behaviour of polyethylene for wear predictions.

Bending Vibrations of a Viscoelastic Euler-Bernoulli Beam – Two Methods and Comparison

2015 ◽  
Vol 762 ◽  
pp. 47-54
Author(s):  
Andrei Craifaleanu ◽  
Nicolaie Orăşanu ◽  
Cristian Dragomirescu
Keyword(s):  
Internal Friction ◽  
Approximate Method ◽  
Viscoelastic Material ◽  
Material Model ◽  
Strain Rates ◽  
Bernoulli Beam ◽  
Bending Vibrations ◽  
Material Models ◽  
Euler Bernoulli Beam ◽  
Free Bending

The study of the bending vibrations of Euler-Bernoulli beams is typically performed based on pure elastic material models, which neglect the damping. However, in practice, due to the internal friction of the material, the vibrations are damped. This phenomenon can be taken into account by using a viscoelastic material model, in which supplementary strains, dependent on the strain rates, are considered. In the paper, free bending vibrations of homogeneous viscoelastic Euler-Bernoulli beams are studied by developing generalized forms of an exact and of an approximate method, respectively, used regularly in the study of pure elastic Euler-Bernoulli beams. The developed methods are applied and compared on a numerical example, highlighting their advantages and limitations.

Viscoelastic Material Models of Polypropylene for Thermoforming Applications

2010 ◽  
Vol 3 (S1) ◽  
pp. 599-602 ◽  
Author(s):  
CPJ O’Connor ◽  
P. J. Martin ◽  
G. Menary
Keyword(s):  
Viscoelastic Material ◽  
Material Models
Sign in / Sign up

Export Citation Format

Share Document