Torsion and normal force responses of glassy polymers in the sub-yield regime |
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| Affiliation: | 1. State Key Laboratory for Strength and Vibration of Mechanical Structures and School of Aerospace, State Key Laboratory for Manufacturing Systems Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. Collaborative Innovation Center for Advanced Aero-Engine, Xue Yuan Road No. 37, Hai Dian District, Beijing 100191, China;1. Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China;2. Mechanical & Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA;3. Normandie Univ, UNIROUEN, Lab SMS, 76000 Rouen, France;4. Normandie Univ, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France |
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| Abstract: | While there is a major body of literature relating the non-linear response of both elastomers and polymer melts with the molecular structure and topology of the chains, the same cannot be said of the non-linear response, especially that below the yield point, for polymer glasses. Here we take an approach that uses ideas of finite deformation elasticity and apply them to the isochronal response of glassy polymers in torsional deformations. We find that, while the torsional (shear) responses are similar for different molecular structures, there seems to be a strong effect of side group relaxations on the normal forces. The results are discussed in terms of the strain energy density function and the opportunities for future research. |
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| Keywords: | Torsion Normal force Glass Polymer Strain energy function Non-linear viscoelasticity |
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