An approach to characterize nonlinear viscoelastic material behavior using dynamic mechanical tests and analyses

1997 ◽  
Author(s):  
Hunter Golden ◽  
Thomas Strganac ◽  
Richard Schapery ◽  
Hunter Golden ◽  
Thomas Strganac ◽  
...  
Keyword(s):  
Viscoelastic Material ◽  
Mechanical Tests ◽  
Material Behavior ◽  
Dynamic Mechanical ◽  
Nonlinear Viscoelastic Material ◽  
Nonlinear Viscoelastic

An Approach to Characterize Nonlinear Viscoelastic Material Behavior Using Dynamic Mechanical Tests and Analyses

1999 ◽  
Vol 66 (4) ◽  
pp. 872-878 ◽  
Author(s):  
H. J. Golden ◽  
T. W. Strganac ◽  
R. A. Schapery
Keyword(s):  
Viscoelastic Model ◽  
Dynamic Test ◽  
Mechanical Analysis ◽  
Mechanical Tests ◽  
Material Behavior ◽  
Dynamic Mechanical ◽  
Nonlinear Characterization ◽  
Nonlinear Viscoelastic ◽  
Linear Viscoelastic ◽  
Nonlinear Viscoelastic Model

Linear viscoelastic properties may be rapidly identified using dynamic mechanical analysis methods, yet these traditional methods do not properly identify nonlinear viscoelastic response. Herein, dynamic mechanical methodologies are extended to provide an approach for nonlinear characterization. The proposed method is based on Schapery's nonlinear viscoelastic model extended to dynamic mechanical theory. The oscillatory loading during a dynamic test is addressed within the nonlinear viscoelastic model. An experimental protocol is established. Analyses and experiments are performed for the characterization of thin-film polyethylene to validate the approach.

A Numerical Study of Plane Longitudinal Waves in a Nonlinear Viscoelastic Material

1974 ◽  
Vol 41 (1) ◽  
pp. 111-116 ◽  
Author(s):  
T. R. Blake ◽  
J. F. Wilson
Keyword(s):  
Wave Propagation ◽  
Viscoelastic Material ◽  
Numerical Study ◽  
Numerical Procedure ◽  
Constitutive Relationship ◽  
Longitudinal Waves ◽  
First Order ◽  
Nonlinear Viscoelastic Material ◽  
Nonlinear Viscoelastic ◽  
Lagrangian Form

A numerical study of plane longitudinal waves in a nonlinear viscoelastic material is presented. The constitutive relationship and the conservation equations, in Lagrangian form, are formulated in an explicit first-order finite-difference manner. The mechanical behavior of the material is described by means of state and orientation variables and the associated differential equations. With the use of the numerical procedure we model wave-propagation experiments in polymethyl methacrylate and derive a constitutive relationship for that material. We then use this constitutive equation in a numerical study of the evolution of steady-state waves and we show that the time for the formation of these waves is inversely proportional to magnitude of the imposed velocity.

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