scholarly journals Evolution of the Nanostructure and Viscoelastic Properties of Nitrile Rubber upon Mechanical Rejuvenation and Physical Aging

2021 ◽  
Author(s):  
Valentine Hervio ◽  
Bruno Bresson ◽  
Annie Brûlet ◽  
Ingrid J. Paredes ◽  
Ayaskanta Sahu ◽  
...  
Keyword(s):  
Viscoelastic Properties ◽  
Physical Aging ◽  
Nitrile Rubber

Changes in Elastic and Viscoelastic Properties of Poly(Methyl methacrylate) by Physical Aging

2011 ◽  
Vol 314-316 ◽  
pp. 914-917
Author(s):  
Wen Bo Luo ◽  
Chu Hong Wang ◽  
Xiu Liu ◽  
Qiang Shen
Keyword(s):  
Aging Time ◽  
Viscoelastic Properties ◽  
Physical Aging ◽  
Creep Compliance ◽  
Aging Effect ◽  
Glassy Polymers ◽  
Time Range ◽  
Asymptotic Values ◽  
Constant Rate ◽  
Linear Manner

The influence of physical aging on mechanical properties of glassy polymers was investigated in this paper. After annealing above Tg to release the previous thermal and stress history, the polymethyl methacrylate (PMMA) samples were quenched to 27°C, aged for various times (ta), and were then stretched at the same temperature by two ways: (1) step stresses with four different magnitudes varying from 15MPa to 30MPa; (2) constant rate stretch up to fracture. The physical aging effect was monitored by measuring the initial instantaneous elastic modulus (E) and the fracture strength (σf) from the stress-strain curves as a function of ta up to 1368h. It is shown that both E and σf of the material increase with aging time and approach to their asymptotic values, which satisfy the KWW rule, while the isochronous creep compliance decreases with log ta in a linear manner within the aging time range considered in this paper.

Dynamic viscoelastic properties of polyvinyl chloride with physical aging

2015 ◽  
Vol 27 (4) ◽  
pp. 259-266 ◽  
Author(s):  
Fang Tian ◽  
Yingshe Luo ◽  
Shuiping Yin ◽  
Hong Wang ◽  
Chun Cao
Keyword(s):  
Polyvinyl Chloride ◽  
Viscoelastic Properties ◽  
Physical Aging

scholarly journals Payne Effect in Filled Nitrile Rubber Submitted to Cyclic Loadings

2012 ◽  
Author(s):  
Pierre P. Garnier ◽  
Jean-Benoît J. B. Le Cam ◽  
Michel M. Grédiac
Keyword(s):  
Cyclic Loading ◽  
Strain Amplitude ◽  
Viscoelastic Properties ◽  
Nitrile Rubber ◽  
Loading Conditions ◽  
Payne Effect ◽  
Two Temperatures ◽  
Loading Tests ◽  
Number Of Cycles ◽  
Cyclic Loading Tests

This study deals with the viscoelastic properties of filled nitrile rubber submitted to cyclic loading conditions. Classic strain amplitude sweeps were first carried out on both a filled and an unfilled nitrile rubber. Tests were performed at two temperatures ambient and 80 °C. Some specimens were then subjected to a high number of cycles to study the variations in the viscoelastic properties and the sensitivity of the Payne effect to cyclic loading tests at several given strain amplitudes.

scholarly journals Theoretical and Numerical Analysis of Anterior Cruciate Ligament Injury and its Prevention

2020 ◽  
pp. 43-54
Author(s):  
Lixiang Yang
Keyword(s):  
Risk Factors ◽  
Finite Element ◽  
Anterior Cruciate Ligament ◽  
Viscoelastic Properties ◽  
Physical Aging ◽  
Cruciate Ligament ◽  
Acl Injury ◽  
Polymer Materials ◽  
Sport Activities ◽  
Anterior Cruciate

Anterior cruciate ligament (ACL) injury is one of major risks for most athletes. ACL injury can be caused by many risk factors such as anatomic risk factors, biomechanical risk factors and environmental risk factors. In this article, numerical and theoretical analysis are conducted to investigate biomechanical risk factors. An entire three-dimensional finite element knee model was built based on MRI data. Anterior Tibial Translations (ATT) at different knee flexion angles are simulated by finite element models. In the simulations, more attentions are given to material properties of different knee components and their effects on ACL injury. Mechanical response of ACL during sport activities is highly determined by its viscoelastic properties. Unfortunately, viscoelastic properties of two bundles of ACL will change dramatically even with several hours’ physical aging. As a consequence, ACL will experience mechanical ductile to brittle transition due to daily physical aging. Theory of physical aging from polymer science is, for the first time, introduced to understand ACL injury and its prevention. By analogy to physical aging of amorphous polymer materials, we think physical aging of two bundles of ACL will largely increase risk of ACL injury. Besides, physical aging will also build a heterogeneous stress and strain in ACL due to its natural anatomic structure, which is a large risk for athletes. The specific designed prevention programs for ACL injury such as plyometrics, strengthening and other neuromuscular training exercises [1] are believed to erase physical aging of ACL. ACL with less physical aging is less likely to get injured in sport activities. In this article, a virtual physical aging simulation is built to validate current hypothesis. Erasing physical aging of ACL may provide an accurate and quantitative way to prevent ACL injury.

Structure, Viscoelastic Properties and Damping Mechanisms of Reactive Butadiene-nitrile Rubber/Epoxy Polymer Blends

2008 ◽  
Vol 36 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Hajime Kishi ◽  
Atsushi Nagao ◽  
Yusaku Kobayashi ◽  
Satoshi Matsuda ◽  
Toshihiko Asami ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Viscoelastic Properties ◽  
Epoxy Polymer ◽  
Nitrile Rubber ◽  
Butadiene Nitrile Rubber

Viscoelastic properties of nitrile rubber filled with lignite fly ash

2010 ◽  
pp. NA-NA
Author(s):  
Manuchet Nillawong ◽  
Narongrit Sombatsompop ◽  
Chakrit Sirisinha
Keyword(s):  
Fly Ash ◽  
Viscoelastic Properties ◽  
Nitrile Rubber ◽  
Lignite Fly Ash

Viscoelastic properties of a bent and straight dimeric liquid crystal

1993 ◽  
Vol 3 (5) ◽  
pp. 597-602 ◽  
Author(s):  
Gregory A. DiLisi ◽  
E. M. Terentjev ◽  
Anselm C. Griffin ◽  
Charles Rosenblatt
Keyword(s):  
Liquid Crystal ◽  
Viscoelastic Properties
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