On the Nonlinear Creep and Recovery of Open Cell Earplug Foams

Calcagno, B.; Garcia, Marjorie; Kuhns, Melissa A; Lakes, Roderic S.

doi:10.1177/026248930802700302

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…The magnet providing the driving torque was a light weight cube about 1 mm on a side glued to the end piece. This earplug foam (a polyurethane foam) has a relatively small cell size similar to that of earplug foam studied previously [12].…”

Section: Methodsmentioning

confidence: 58%

Frequency Dependence of Poisson's Ratio of Viscoelastic Elastomer Foam

Lakes

2011

Cellular Polymers

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All polymer foams are viscoelastic; for foams used in earplugs, this response is essential to their function. Poisson's ratio was inferred from viscoelastic response of earplug foam in torsion and bending. Poisson's ratio increases with frequency as a result of stress induced air flow. Air within the pores contributes to the overall bulk modulus at high frequency, but not at low frequency at which it easily flows when the foam is deformed. Such behaviour is the opposite of that of solid polymers in which the shear modulus varies with frequency much more than the bulk modulus.

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Section: Methodsmentioning

confidence: 58%

Frequency Dependence of Poisson's Ratio of Viscoelastic Elastomer Foam

Lakes

2011

Cellular Polymers

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Measurement of the local static mechanical pressure of earplugs

Melo,

Dalaq,

Sgard

et al. 2024

International Journal of Mechanical Sciences

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Creep Modelling of a Material by Non-Linear Modified Schapery’s Viscoelastic Model

Atchounga¹,

Kamdjo²,

Foadieng³

et al. 2017

WJET

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This research work aims at modeling the creep behavior of a material by a non-linear schapery's viscoelastic model. We started with analytical part where three powerful methods of creep modeling have been developed and compared. That is the Heaviside, the Nordin and Varna and lastly our own proposed methods. From this preliminary study, it came out that our method is different to the two others because we took into account the loading time at the creep beginning. Besides we studied several loading programs and retained a five order non-linear polynomial which is the program that gave us satisfactory results. The other loading functions led to divergent results and wasn't present here as consequence. In the second part of this work, we devoted ourselves to the determination of non-linear parameters in the schapery's viscoelasticity equation, through a well developed and illustrated methodology. From this study, it is straight forward that non-linear parameters are stress dependent; confirming the results of several authors that preceded us in this studying field.

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On the Nonlinear Creep and Recovery of Open Cell Earplug Foams

Cited by 3 publications

References 7 publications

Frequency Dependence of Poisson's Ratio of Viscoelastic Elastomer Foam

Frequency Dependence of Poisson's Ratio of Viscoelastic Elastomer Foam

Measurement of the local static mechanical pressure of earplugs

Creep Modelling of a Material by Non-Linear Modified Schapery’s Viscoelastic Model

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