Evaluation of molecular linear viscoelastic models for polydisperse H polybutadienes

2011 ◽  
Vol 55 (6) ◽  
pp. 1341-1373 ◽  
Author(s):  
Si Wan Li ◽  
Heon E. Park ◽  
John M. Dealy
Keyword(s):  
Viscoelastic Models ◽  
Linear Viscoelastic

Linear viscoelastic models

2009 ◽  
Vol 156 (1-2) ◽  
pp. 129-138 ◽  
Author(s):  
Tommi Borg ◽  
Esko J. Pääkkönen
Keyword(s):  
Viscoelastic Models ◽  
Linear Viscoelastic

Optimization of a Viscoelastic Structure: The Seat-Belt Problem

1969 ◽  
Vol 36 (3) ◽  
pp. 565-572 ◽  
Author(s):  
W. Nachbar ◽  
J. B. Schipmo¨lder
Keyword(s):  
Seat Belt ◽  
Viscoelastic Model ◽  
Small Strain ◽  
The Body ◽  
Strain Rates ◽  
Maximum Displacement ◽  
Critical Displacement ◽  
Viscoelastic Models ◽  
Maximum Value ◽  
Linear Viscoelastic

Optimization of the parameters of elementary linear viscoelastic models is considered for the design of a lap seat belt in automobiles. The vehicle is assumed to stop abruptly on impact. The parameters are optimized to allow the speed of the vehicle before impact to have the largest permissible value consistent with constraints imposed for the safety of the user of the belt. The constraints chosen here are: (a) the maximum displacement of the body after impact is equal to or less than a prescribed critical displacement; (b) the forward speed of the body at the critical displacement does not exceed a prescribed maximum value; (c) the force exerted by the belt on the body during the motion following impact does not exceed a prescribed maximum value. It is found that the optimized Kelvin-Voigt viscoelastic model is nearly 40 percent more effective than the purely elastic material. It is nearly as effective as constant deceleration. An additional and advantageous property is proposed, moreover, for belts of viscoelastic materials. This is that the material should have a relatively low spring rate at relatively small strain rates. The optimized belts for the elementary viscoelastic models are shown to be quite stiff at low strain rates, however.

Linear viscoelastic models

2010 ◽  
Vol 165 (1-2) ◽  
pp. 24-31 ◽  
Author(s):  
Tommi Borg ◽  
Esko J. Pääkkönen
Keyword(s):  
Viscoelastic Models ◽  
Linear Viscoelastic

Linear viscoelastic models

2009 ◽  
Vol 156 (1-2) ◽  
pp. 121-128 ◽  
Author(s):  
Tommi Borg ◽  
Esko J. Pääkkönen
Keyword(s):  
Viscoelastic Models ◽  
Linear Viscoelastic

A Nonlinear Viscoelastic Model for the Relaxation Behavior of Tendon

2012 ◽  
Author(s):  
Frances M. Davis ◽  
Raffaella De Vita
Keyword(s):  
Stress Relaxation ◽  
Relaxation Function ◽  
Viscoelastic Model ◽  
Viscoelastic Behavior ◽  
Relaxation Behavior ◽  
Successful Model ◽  
Viscoelastic Models ◽  
Nonlinear Viscoelastic ◽  
Linear Viscoelastic ◽  
Nonlinear Viscoelastic Model

Tendons are viscoelastic materials which undergo stress relaxation when held at a constant strain. The most successful model used to describe the viscoelastic behavior of tendons is the quasi-linear viscoelastic (QLV) model [1]. In the QLV model, the relaxation function is assumed to be a separable function of time and strain. Recently, this assumption has been shown to be invalid for tendons [2] thus suggesting the need for new nonlinear viscoelastic models.

Non-linear viscoelastic models predict fingertip pulp force-displacement characteristics during voluntary tapping

2003 ◽  
Vol 36 (4) ◽  
pp. 497-503 ◽  
Author(s):  
Devin L. Jindrich ◽  
Yanhong Zhou ◽  
Theodore Becker ◽  
Jack Tigh Dennerlein
Keyword(s):  
Viscoelastic Models ◽  
Non Linear ◽  
Linear Viscoelastic ◽  
Force Displacement
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