Frequency Dependence of Poisson's Ratio of Viscoelastic Elastomer Foam

Lakes, Roderic S.

doi:10.1177/026248931103000601

Cited by 15 publications

(11 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In rubbery state GF/PDMS and PDMS foam behave like viscous polymer but the inclusion of graphene does not allow much of the interfacial slippage in polymer so the difference in tan delta values is negligible. longer for the mitigation of applied force, the modulus of porous cells gets relaxed to zero [41] and with the increase in frequency polymer chains become more immobile and energy loss decreases due to decrease in damping. However, after an optimum frequency (13 Hz in this case), tan delta value enhanced with the increase in frequency.…”

Section: Temperature Dependence Of Storage Modulus and Tan Deltamentioning

confidence: 99%

“…Hence, the energy loss increases with the increasing frequency. However, after a certain frequency (here approximately 20 Hz) in the rubbery state, tan delta value fluctuates more due to the presence of air within the porous structure [41] for both GF/PDMS and PDMS foam. Hence, a similar behavior is observed at both the temperatures.…”

Section: Temperature Dependence Of Storage Modulus and Tan Deltamentioning

confidence: 99%

See 1 more Smart Citation

Temperature dependent compressive behavior of graphene mediated three-dimensional cellular assembly

Ghosh

Reddy

Sridhar

et al. 2016

Carbon

View full text Add to dashboard Cite

Section: Temperature Dependence Of Storage Modulus and Tan Deltamentioning

confidence: 99%

Section: Temperature Dependence Of Storage Modulus and Tan Deltamentioning

confidence: 99%

Temperature dependent compressive behavior of graphene mediated three-dimensional cellular assembly

Ghosh

Reddy

Sridhar

et al. 2016

Carbon

View full text Add to dashboard Cite

“…5 In addition, frequency-dependent Poisson's ratio of elastomer foam has been revealed to show Zener-type behavior. 6 In this paper, theoretical estimations and experimental determinations of torque and bending moment are presented. Linear viscoelastic properties of PMMA are deduced form our experimental data, and qualitatively compared with predictions from the standard linear solid model.…”

Section: Introductionmentioning

confidence: 99%

Accurate Determination of Torsion and Pure Bending Moment for Viscoelastic Measurements

Wang

Shiau

2013

Int. J. Mod. Phys. Conf. Ser.

View full text Add to dashboard Cite

Measurements of time-dependent material properties in the context of linear viscoelasticity, at a given frequency and temperature, require accurate determination of both loading and deformation that are subjected to the testing materials. A pendulum-type viscoelastic spectroscopy is developed to experimentally measure loss tangent and the magnitude of dynamic modulus of solid materials. The mechanical system of the device is based on the behavior of the cantilever beam, and torsion and pure bending moment are generated from the interaction between a permanent magnet and the Helmholtz coils. The strength of the magnetic interactions may be determined with a material with known mechanical properties, such as aluminum 6061T4 alloy. The sensitivity of the torque measurement is on the order of one micro N-m level. With the high accurate torque measurement and deformation detection from a laser-based displacement measurement system, viscoelastic properties of materials can be experimentally measured in different frequency regimes. Sinusoidal driving signals are adopted for measuring complex modulus in the sub-resonant regime, and dc bias driving for creep tests in the low frequency limit. At structural resonant frequencies, the full-width-at-half-maximum (FWHM) method or Lorentzian curve fitting method is adopted to extract material properties. The completion of determining material properties in the wide frequency spectrum may help to identify the deformation mechanisms of the material and to create better models for simulation work.

show abstract

“…

1IntroductionThe viscoelastic Poisson's ratio, n(t), is amaterialm echanical property,w hich is closely related to time,t emperature, and strain [1][2][3][4][5][6][7][8][9][10][11].S olid propellants are viscoelastic materials and the Poisson's ratio of solid propellants is an essential input parameter in structural integrity analysis of solid rocket motors (SRM). It has been shown that changes of the Poisson's ratio in micrometer level have great influence on the structural integrity analysis of solid rocket motors [12,13].I ti sc ommonly assumed thatt he Poisson'sr atio is am aterial constant and independent of temperature and strain [14,15].I na ddition, the aging effect on the Poisson's ratio attracts attention in the shelf life predictiono fp ropellants [16].T hus, there are practical as well as theoretical aspects that make it highly desirable to stimulatet he experimental determination of the Poisson's ratio of solid propellants on as ecure analyticalf oundation.Previously,i th as been attempted to use manyd irect or indirect methods measure viscoelastic Poisson's ratio for al ong time.

…”

mentioning

confidence: 99%

“…Measurements of viscoelastic moduli in torsiona nd bending have been conducted at ambientt emperature,2 2 8C, using broadbandv iscoelastic spectroscopy by Dong. The Poisson'sr atio was inferred from frequency-dependent torsional and bendingm oduli [9].Based on the integral transform relationso fs tress relaxation modulus, body modulus and viscoelastic Poisson's ratio, the viscoelastic Poisson's ratio of solid propellants was calculated by using the inversion of Laplace transform and numerical integral [1].H ee tal. built cylindrical motors methodt od eterminet he Poisson'sr atio of solid propellants [5].A ccording to the maximum radial deformations of the perforations of cylindrical motors with two different outer-inner radial ratios after having been cured and drop-[a] H.Abstract:D igital image correlation methodsw ere used for further studieso ft he viscoelastic Poisson'sr atio of solid propellants.…”

mentioning

confidence: 99%

Study on the Viscoelastic Poisson‘s Ratio of Solid Propellants Using Digital Image Correlation Method

Cui

Tang

Shen

2016

Propellants Explo Pyrotec

View full text Add to dashboard Cite

Digital image correlation methods were used for further studies of the viscoelastic Poisson's ratio of solid propellants. The Poisson's ratio and the Young's relaxation modulus of solid propellants were separately determined in a single stress relaxation test. In addition, the effects of temperature, longitudinal strain, preload and storage time on the Poisson's ratio of solid propellants were discussed. The Poisson's ratio master curve and the Young's relaxation modulus master curve were constructed based on the time‐temperature equivalence principle. The obtained results showed that the Poisson's ratio of solid propellants is a monotone non‐decreasing function of time, the instantaneous Poisson's ratio increased from 0.3899 to 0.4858 and the time of the equilibrium Poisson's ratio occurred late when the temperature was varied from −30 °C to 70 °C. The Poisson's ratio increased with temperature and longitudinal strain, decreased with preload and storage time, while the amplitude Poisson's ratio increased with preload, decreases with longitudinal strain and storage time. The time of the equilibrium Poisson's ratio occurred in advance with the increase of longitudinal strain, preload and storage time.

show abstract

Frequency Dependence of Poisson's Ratio of Viscoelastic Elastomer Foam

Cited by 15 publications

References 12 publications

Temperature dependent compressive behavior of graphene mediated three-dimensional cellular assembly

Temperature dependent compressive behavior of graphene mediated three-dimensional cellular assembly

Accurate Determination of Torsion and Pure Bending Moment for Viscoelastic Measurements

Study on the Viscoelastic Poisson‘s Ratio of Solid Propellants Using Digital Image Correlation Method

Contact Info

Product

Resources

About