Dynamic Properties of Filled Rubber — Part I: Simple Model, Experimental Data and Simulated Results

2008 ◽  
Vol 81 (1) ◽  
pp. 1-18 ◽  
Author(s):  
H. R. Ahmadi ◽  
J. G. R. Kingston ◽  
A. H. Muhr
Keyword(s):  
Dynamic Properties ◽  
Cyclic Stress ◽  
Material Behavior ◽  
Stress Strain ◽  
Viscoplastic Model ◽  
Strain Behavior ◽  
Fitting Procedure ◽  
Filled Rubber ◽  
Constant Rate ◽  
Rubber Part

Abstract A simple “viscoplastic” model is used to capture the stress-strain behavior of a filled SBR vulcanizate; a key objective is to predict dynamic properties, in particular the Fletcher-Gent or Payne effect, from non-cyclic stress-strain data. A simple fitting procedure is described to obtain the parameters of the viscoplastic model from the stress relaxation data and stress-strain loading curves at constant rate. Special attention is given to keeping the numbers of parameters and of characterization tests small. Elastic models are incapable of representing several aspects of the material behavior whereas it is confirmed that the proposed “viscoplastic” approach captures the essence of the behavior.

DYNAMIC PROPERTIES OF FILLED RUBBER. PART II: PHYSICAL BASIS OF CONTRIBUTIONS TO THE MODEL

2011 ◽  
Vol 84 (1) ◽  
pp. 24-40 ◽  
Author(s):  
H. R. Ahmadi ◽  
A. H. Muhr
Keyword(s):  
Literature Review ◽  
Simple Shear ◽  
Time Domain ◽  
Dynamic Properties ◽  
Uniaxial Stress ◽  
Domain Model ◽  
Strain Behavior ◽  
Filled Rubber ◽  
Rubber Part ◽  
Analytical Expressions

Abstract A relatively simple time-domain model is proposed with the scope to capture those aspects of the uniaxial stress–strain behavior of filled rubber that are most significant in engineering applications, and is discussed in the context of a literature review. Its performance is investigated in simple shear using analytical expressions. Attention has been given to assembling the model from separate physical contributions, each already established in the literature, so that not only is the number of parameters small but also they may be at least semi-quantitatively related to the formulation of the elastomer. The small number of parameters helps to keep tests for fitting them simple, while their connection to mechanisms also enables a degree of utility of the model even when extrapolated to situations beyond those covered by tests.

Cyclic Stress-Strain Behavior of Reinforcing Steel Including Effect of Buckling

1999 ◽  
Vol 125 (6) ◽  
pp. 605-612 ◽  
Author(s):  
Mario E. Rodriguez ◽  
Juan C. Botero ◽  
Jaime Villa
Keyword(s):  
Cyclic Stress ◽  
Reinforcing Steel ◽  
Stress Strain ◽  
Strain Behavior

Hyperelastic Muscle Simulation

2007 ◽  
Vol 345-346 ◽  
pp. 1241-1244 ◽  
Author(s):  
Mohd. Zahid Ansari ◽  
Sang Kyo Lee ◽  
Chong Du Cho
Keyword(s):  
Skeletal Muscle ◽  
Silicone Rubber ◽  
Soft Tissues ◽  
Material Model ◽  
Incompressible Material ◽  
Material Behavior ◽  
Rubber Tube ◽  
Stress Strain ◽  
Element Analysis ◽  
Strain Behavior

Biological soft tissues like muscles and cartilages are anisotropic, inhomogeneous, and nearly incompressible. The incompressible material behavior may lead to some difficulties in numerical simulation, such as volumetric locking and solution divergence. Mixed u-P formulations can be used to overcome incompressible material problems. The hyperelastic materials can be used to describe the biological skeletal muscle behavior. In this study, experiments are conducted to obtain the stress-strain behavior of a solid silicone rubber tube. It is used to emulate the skeletal muscle tensile behavior. The stress-strain behavior of silicone is compared with that of muscles. A commercial finite element analysis package ABAQUS is used to simulate the stress-strain behavior of silicone rubber. Results show that mixed u-P formulations with hyperelastic material model can be used to successfully simulate the muscle material behavior. Such an analysis can be used to simulate and analyze other soft tissues that show similar behavior.

Cyclic stress–strain behavior and load sharing in duplex stainless steels: Aspects of modeling and experiments

2007 ◽  
Vol 55 (16) ◽  
pp. 5359-5368 ◽  
Author(s):  
R. Lillbacka ◽  
G. Chai ◽  
M. Ekh ◽  
P. Liu ◽  
E. Johnson ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Load Sharing ◽  
Cyclic Stress ◽  
Duplex Stainless Steels ◽  
Stress Strain ◽  
Strain Behavior ◽  
Modeling And Experiments

Low-Cycle Fatigue Evaluation Using the Weld Master S-N Curve

2006 ◽  
Author(s):  
P. Dong ◽  
Z. Cao ◽  
J. K. Hong
Keyword(s):  
Test Data ◽  
Low Cycle Fatigue ◽  
Strain Curve ◽  
Cyclic Stress ◽  
Structural Stress ◽  
Stress Strain ◽  
Strain Behavior ◽  
Scale Test ◽  
Stress Estimation ◽  
Fatigue Evaluation

In the context of fatigue evaluation in the low-cycle regime, the use of the master S-N curve in conjunction with elastic FE-based structural stress calculations is presented. An elastic pseudo structural stress estimation is introduced by assuming that Neuber’s rule applies in relating structural stress and strain concentration at a weld to the material’s cyclic stress-strain behavior. With the pseudo structural stress procedure, recent sources of recent full scale test data on pipe and vessel welds were analyzed as a validation of the proposed procedure. The estimated fatigue lives versus actual test lives show a reasonable agreement. Finally, the feasibility of using monotonic stress-strain curves as a first approximation is also examined for applications when cyclic stress-strain curve may not be readily found. The analysis results indicate that the life estimations using monotonic stress-strain curves are reasonable, with the recent test data falling within mean ± 2σ, where σ represents the standard deviation of the master S-N curve.

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