On necessary precautions when measuring solid polymer linear viscoelasticity with dynamic analysis in torsion
Solid polymer linear viscoelasticity in shear is often characterized by applying torsion and using the Saint-Venant solution when rectangular prismatic specimens are considered. It is shown that experimental dynamic torsion tests can show a dependency of the storage modulus and damping factor on the...
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| Veröffentlicht in: | Polymer testing 2017-10, Vol.63, p.275-280 |
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| creator | Diani, Julie Gilormini, Pierre |
| description | Solid polymer linear viscoelasticity in shear is often characterized by applying torsion and using the Saint-Venant solution when rectangular prismatic specimens are considered. It is shown that experimental dynamic torsion tests can show a dependency of the storage modulus and damping factor on the dimensions of the rectangular prismatic specimen when linear temperature ramps are applied. While the discrepancy of damping factor is explained by temperature heterogeneities and can be corrected easily by applying temperature steps, the inconsistency of storage modulus is due to an invalid application of the Saint-Venant solution. Finite element simulations allowed definition of the sample dimensions for which the Saint-Venant solution provides a good approximation, and a coefficient is given to correct the results obtained with commercial instruments when other sample dimensions are used. |
| doi_str_mv | 10.1016/j.polymertesting.2017.08.025 |
| format | Article |
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| ispartof | Polymer testing, 2017-10, Vol.63, p.275-280 |
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| source | Elsevier ScienceDirect Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Damping Dynamic analysis Engineering Sciences Finite element method Measuring instruments Mechanics Mechanics of materials Polymers Ramps Solid Storage modulus Temperature Torsion Torsion tests Viscoelasticity |
| title | On necessary precautions when measuring solid polymer linear viscoelasticity with dynamic analysis in torsion |
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