Mechanical Behavior of Amorphous Polymers in Shear

ZHANG Yun; HUANG Zhu-ping

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ZHANG Yun, HUANG Zhu-ping. Mechanical Behavior of Amorphous Polymers in Shear[J]. Applied Mathematics and Mechanics, 2004, 25(10): 997-1006.

Citation:

ZHANG Yun, HUANG Zhu-ping. Mechanical Behavior of Amorphous Polymers in Shear[J]. Applied Mathematics and Mechanics, 2004, 25(10): 997-1006.

Citation:

ZHANG Yun, HUANG Zhu-ping. Mechanical Behavior of Amorphous Polymers in Shear[J]. Applied Mathematics and Mechanics, 2004, 25(10): 997-1006.

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Mechanical Behavior of Amorphous Polymers in Shear

State Key Labora tory for Tur bulence and Complex Systems,Department of Mechanics and Engineering Science, Peking University, Beijing 0087, P. R. China

Received Date: 2003-06-03
Rev Recd Date: 2004-06-08
Publish Date: 2004-10-15

Abstract

Abstract

Based on the non-equilibrium thermodynamic theory,a new thermo-viscoelastic constitutive model for an incompressible material is proposed.This model can be considered as a kind of generalization of the non-Gaussian network theory in rubber elasticity to include the viscous and the thermal effects.A set of second rank tensorial internal variables was introduced,and in order to adequately describe the evolution of these internal variables,a new expression of the Helmholtz free energy was suggested.The mechanical behavior of the thermo-viscoelastic material under simple shear deformation was studied,and the/viscous dissipation induced0 anisotropy due to the change of orientation distribution of molecular chains was examined.Influences of strain rate and thermal softening produced by the viscous dissipation on the shear stress were also discussed.Finally,the model predictions were compared with the experimental results performed by G.Sell et al,thus the validity of the proposed model is verified.
- thermo-viscoelastic constitutive theory,
- non-Gaussian network model,
- finite deformation,
- simple shear deformation,
- non-equilibrium thermodynamics

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References(15)

References

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