Static and dynamic strain-dependent viscoelastic behavior of black-filled EPDM vulcanizates

1994 ◽  
Vol 53 (7) ◽  
pp. 877-889 ◽  
Author(s):  
C. S. S. Namboodiri ◽  
D. K. Tripathy
Keyword(s):  
Viscoelastic Behavior ◽  
Dynamic Strain ◽  
Strain Dependent

Thermally Induced Crosslinking between Polyacrylic Acid and Epoxidised Natural Rubber: Effect of Carbon Black Filler on Strain Dependent Dynamic Mechanical Properties

1994 ◽  
Vol 67 (5) ◽  
pp. 845-853 ◽  
Author(s):  
A. Mallick ◽  
D. K. Tripathy ◽  
S. K. De
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
Natural Rubber ◽  
Strain Amplitude ◽  
Polyacrylic Acid ◽  
Dynamic Mechanical Properties ◽  
Dynamic Strain ◽  
Thermally Induced ◽  
Dynamic Mechanical ◽  
Strain Dependent

Abstract Increases in dynamic strain amplitude (DSA) causes changes in the dynamic mechanical properties of high abrasion furnace (HAF) carbon black filled polyacrylic acid (PAA) and epoxidised natural rubber (ENR) blends. But the changes are more prominent in comparison to conventional rubber vulcanizates. It is believed that crosslinking between PAA and ENR in the presence of carbon black results in the formation of a network-induced-agglomerate superstructure which, however, breaks down on the application of dynamic strain.

scholarly journals A Recruitment Model of Tendon Viscoelasticity That Incorporates Fibril Creep and Explains Strain-Dependent Relaxation

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Tom Shearer ◽  
William J. Parnell ◽  
Barbara Lynch ◽  
Hazel R. C. Screen ◽  
I. David Abrahams
Keyword(s):  
Soft Tissues ◽  
Length Distribution ◽  
Viscoelastic Behavior ◽  
Mechanical Tests ◽  
The Matrix ◽  
Tail Tendon ◽  
Fibril Length ◽  
Changes Over Time ◽  
Constitutive Parameters ◽  
Strain Dependent

Abstract Soft tissues exhibit complex viscoelastic behavior, including strain-rate dependence, hysteresis, and strain-dependent relaxation. In this paper, a model for soft tissue viscoelasticity is developed that captures all of these features and is based upon collagen recruitment, whereby fibrils contribute to tissue stiffness only when taut. We build upon existing recruitment models by additionally accounting for fibril creep and by explicitly modeling the contribution of the matrix to the overall tissue viscoelasticity. The fibrils and matrix are modeled as linear viscoelastic and each fibril has an associated critical strain (corresponding to its length) at which it becomes taut. The model is used to fit relaxation tests on three rat tail tendon fascicles and predict their response to cyclic loading. It is shown that all of these mechanical tests can be reproduced accurately with a single set of constitutive parameters, the only difference between each fascicle being the distribution of their fibril crimp lengths. By accounting for fibril creep, we are able to predict how the fibril length distribution of a fascicle changes over time under a given deformation. Furthermore, the phenomenon of strain-dependent relaxation is explained as arising from the competition between the fibril and matrix relaxation functions.

Mouse paternal-RNAs initiate pattern of metabolic disorders in a strain dependent manner

2016 ◽  
Author(s):  
Guzide Satir Basaran ◽  
Yagut Akbarova ◽  
Kezban Korkmaz ◽  
Kursad Unluhizarci ◽  
Francois Cuzin ◽  
...  
Keyword(s):  
Metabolic Disorders ◽  
Dependent Manner ◽  
Strain Dependent

Atomistic Simulation Study of Controlled Nanostructure Patterning

2003 ◽  
Vol 775 ◽  
Author(s):  
Byeongchan Lee ◽  
Kyeongjae Cho
Keyword(s):  
Diffusion Barrier ◽  
Atomistic Simulation ◽  
Degrees Of Freedom ◽  
Embedded Atom Method ◽  
Surface Kinetics ◽  
Bulk Properties ◽  
Embedded Atom ◽  
Kinetics Of ◽  
Dissociation Barrier ◽  
Strain Dependent

AbstractWe investigate the surface kinetics of Pt using the extended embedded-atom method, an extension of the embedded-atom method with additional degrees of freedom to include the nonbulk data from lower-coordinated systems as well as the bulk properties. The surface energies of the clean Pt (111) and Pt (100) surfaces are found to be 0.13 eV and 0.147 eV respectively, in excellent agreement with experiment. The Pt on Pt (111) adatom diffusion barrier is found to be 0.38 eV and predicted to be strongly strain-dependent, indicating that, in the compressive domain, adatoms are unstable and the diffusion barrier is lower; the nucleation occurs in the tensile domain. In addition, the dissociation barrier from the dimer configuration is found to be 0.82 eV. Therefore, we expect that atoms, once coalesced, are unlikely to dissociate into single adatoms. This essentially tells that by changing the applied strain, we can control the patterning of nanostructures on the metal surface.

Nonlinear Viscoelastic Finite Element Analysis of Adhesive Joints

1988 ◽  
Vol 16 (3) ◽  
pp. 146-170 ◽  
Author(s):  
S. Roy ◽  
J. N. Reddy
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Viscoelastic Behavior ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Adhesively Bonded Joints ◽  
Nonlinear Viscoelastic ◽  
Structural Failures ◽  
Updated Lagrangian

Abstract A good understanding of the process of adhesion from the mechanics viewpoint and the predictive capability for structural failures associated with adhesively bonded joints require a realistic modeling (both constitutive and kinematic) of the constituent materials. The present investigation deals with the development of an Updated Lagrangian formulation and the associated finite element analysis of adhesively bonded joints. The formulation accounts for the geometric nonlinearity of the adherends and the nonlinear viscoelastic behavior of the adhesive. Sample numerical problems are presented to show the stress and strain distributions in bonded joints.

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