Large Strain Stress Relaxation and Recovery Behavior of Amorphous Ethylene−Styrene Interpolymers

1999 ◽  
Vol 32 (22) ◽  
pp. 7587-7593 ◽  
Author(s):  
H. Y. Chen ◽  
E. V. Stepanov ◽  
S. P. Chum ◽  
A. Hiltner ◽  
E. Baer
Keyword(s):  
Stress Relaxation ◽  
Large Strain ◽  
Recovery Behavior ◽  
Strain Stress

Nonseparable Behavior in Rubber Viscoelasticity

1989 ◽  
Vol 62 (1) ◽  
pp. 68-81 ◽  
Author(s):  
J. L. Sullivan ◽  
K. A. Mazich
Keyword(s):  
Stress Relaxation ◽  
Relaxation Spectrum ◽  
Loss Modulus ◽  
Large Strain ◽  
Viscoelastic Behavior ◽  
Strain Effects ◽  
Mixed Response ◽  
Strain Stress ◽  
Necessary And Sufficient ◽  
Solid Liquid

Abstract New large-strain rubber viscoelasticity results for a filled and an unfilled IIR vulcanizate and previously published results for two NR gum vulcanizates have been discussed. The data show that the “mixed” response functions of large-strain stress relaxation, and the incremental storage and relaxation moduli do not demonstrate factorizability of time and strain effects. This is a consequence of the elastic and relaxation contributions in each of the mixed functions being different. The incremental dynamic data also show that the loss modulus for the filled IIR and unfilled NR vulcanizates (unavailable for the unfilled IIR) are separable functions of time and strain. This directly shows that the relaxation spectra for the filled IIR and unfilled NR vulcanizates are independent of strain for the deformations studied. In fact, it is argued that a necessary and sufficient condition for the relaxation spectrum to be independent of strain is that the loss modulus is a factorizable function of time and strain effects. The quantitative success of the Generalized Solid-Liquid (GSL) model in representing the viscoelastic behavior of the gum NR vulcanizate has been reviewed. Although the GSL model applies only to unfilled vulcanizates, it has also been successfully used to qualitatively interpret the results for the filled IIR compounds. Both successes are attributed to the physical assumptions intrinsic to the GSL model; more specifically, 1) the relaxation spectrum is independent of the state of strain, and 2) the deformational dependences of elastic and relaxation contributions to the overall response of the system need not be the same. Physical arguments justifying these assumptions have been covered. It has also been shown with the aid of the GSL model, that a material might exist which demonstrates factorizability in stress relaxation and incremental loss modulus behaviors but nonfactorizability in the incremental storage and relaxation moduli.

Strain, Stress and Stress Relaxation in Oxidized Zrcual-Based Bulk Metallic Glass

2020 ◽  
Author(s):  
Saber Haratian ◽  
Frank Niessen ◽  
Flemming B. Grumsen ◽  
Mitchell J. B. Nancarrow ◽  
Elena Pereloma ◽  
...  
Keyword(s):  
Stress Relaxation ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Strain Stress

scholarly journals A New Hybrid Viscoelastic Soft Tissue Model based on Meshless Method for Haptic Surgical Simulation

2013 ◽  
Vol 7 (1) ◽  
pp. 116-124 ◽  
Author(s):  
Yidong Bao ◽  
Dongmei Wu ◽  
Zhiyuan Yan ◽  
Zhijiang Du
Keyword(s):  
Soft Tissue ◽  
Stress Relaxation ◽  
Surgical Simulation ◽  
Viscoelastic Model ◽  
Stress Strain ◽  
Tissue Model ◽  
The Real ◽  
Strain Stress ◽  
Formula Derivation ◽  
Stability And Accuracy

This paper proposes a hybrid soft tissue model that consists of a multilayer structure and many spheres for surgical simulation system based on meshless. To improve accuracy of the model, tension is added to the three-parameter viscoelastic structure that connects the two spheres. By using haptic device, the three-parameter viscoelastic model (TPM) produces accurate deformationand also has better stress-strain, stress relaxation and creep properties. Stress relaxation and creep formulas have been obtained by mathematical formula derivation. Comparing with the experimental results of the real pig liver which were reported by Evren et al. and Amy et al., the curve lines of stress-strain, stress relaxation and creep of TPM are close to the experimental data of the real liver. Simulated results show that TPM has better real-time, stability and accuracy.

Experimental Characterization and Finite Element Prediction of Large Strain Spring-Back Behavior of Poly(Methyl Methacrylate)

2019 ◽  
Vol 141 (3) ◽  
Author(s):  
D. Mathiesen ◽  
A. Kakumani ◽  
R. B. Dupaix
Keyword(s):  
Finite Element ◽  
Glass Transition ◽  
Methyl Methacrylate ◽  
Large Strain ◽  
Hot Embossing ◽  
Large Strains ◽  
Spring Back ◽  
Simulation Accuracy ◽  
Poly Methyl Methacrylate ◽  
Strain Stress

Spring-back of poly(methyl methacrylate) (PMMA) at large strains, various embossing temperatures, and release temperatures below glass transition is quantified through modified unconfined recovery tests. Cooling, as well as large strains, is shown to reduce the amount of spring-back. Despite reducing the amount of spring-back, these experiments show that there is still a substantial amount present that needs to be accounted for in hot embossing processes. Spring-back is predicted using finite element simulations utilizing a constitutive model for the large strain stress relaxation behavior of PMMA. The model's temperature dependence is modified to account for cooling and focuses on the glass transition temperature region. Spring-back is predicted with this model, capturing the temperature and held strain dependence. Temperature assignment of the sample is found to have the largest effect on simulation accuracy. Interestingly, despite large thermal gradients in the PMMA, a uniform temperature approximation still yields reasonably accurate spring-back predictions. These experiments and simulations fill a substantial gap in knowledge of large strain recovery of PMMA under conditions normally found in hot embossing.

The Torsional Impedance test: short-time, large-strain stress response in tough polymers

Polymer ◽  
1998 ◽  
Vol 39 (25) ◽  
pp. 6347-6355 ◽  
Author(s):  
S.J.K. Ritchie ◽  
P.S. Leevers
Keyword(s):  
Stress Response ◽  
Large Strain ◽  
Strain Stress ◽  
Short Time

The Bending and Recovery of Fabrics under Conditions of Changing Temperature and Relative Humidity

1976 ◽  
Vol 46 (2) ◽  
pp. 113-122 ◽  
Author(s):  
B. M. Chapman
Keyword(s):  
Stress Relaxation ◽  
Relative Humidity ◽  
Relaxation Behavior ◽  
Bending Stress ◽  
Relaxation Data ◽  
Viscoelastic Parameter ◽  
Stress Relaxation Behavior ◽  
Recovery Behavior ◽  
Linear Viscoelastic ◽  
Viscoelastic Element

The bending stress relaxation and recovery behavior of fabrics under conditions of changing temperature and humidity has been investigated. The fabric recovery is successfully predicted, from its stress relaxation behavior and a frictional parameter, using a previously presented model consisting of a generalized linear viscoelastic element in parallel with a frictional element. Furthermore, a viscoelastic parameter, simply obtainable from the relaxation data, together with the frictional parameter, have been shown to correlate well with observed recovery and may be useful as convenient indicators of fabric wrinkle performance.

scholarly journals Stress Relaxation of Polymer Solutions under Large Strain

1971 ◽  
Vol 2 (4) ◽  
pp. 550-552 ◽  
Author(s):  
Yoshiyuki Einaga ◽  
Kunihiro Osaki ◽  
Michio Kurata ◽  
Shin-ichi Kimura ◽  
Mikio Tamura
Keyword(s):  
Stress Relaxation ◽  
Polymer Solutions ◽  
Large Strain

Strain, stress and stress relaxation in oxidized ZrCuAl-based bulk metallic glass

2020 ◽  
Vol 200 ◽  
pp. 674-685
Author(s):  
Saber Haratian ◽  
Frank Niessen ◽  
Flemming B. Grumsen ◽  
Mitchell J.B. Nancarrow ◽  
Elena V. Pereloma ◽  
...  
Keyword(s):  
Stress Relaxation ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Strain Stress
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