The nonlinear viscoelastic response and apparent rejuvenation of an epoxy glass
作者:
W. K. Waldron,
G. B. McKenna,
M. M. Santore,
期刊:
Journal of Rheology
(AIP Available online 1995)
卷期:
Volume 39,
issue 2
页码: 471-497
ISSN:0148-6055
年代: 1995
DOI:10.1122/1.550708
出版商: The Society of Rheology
关键词: EPOXIDES;VISCOELASTICITY;GLASS;AGING;POLYMERS;STRESS RELAXATION;TORSION;STRAINS;GLASS TRANSFORMATIONS;STRESS−STRAIN RELATION
数据来源: AIP
摘要:
Following a quench from above the glass transition temperatureTgto below, it is known that the mechanical response evolves (physical aging) and can be represented by a time‐aging time superposition principle. The value of the aging time shift factorateis known to depend on the magnitude of the applied stress or strain. Here the viscoelastic response of a material undergoing physical aging and subjected to a single large strain ‘‘probe’’ (step deformation followed by a step to zero deformation) followed by small strain probes is analyzed. It was found that a Bernstein, Kearsley, and Zapas (BKZ) constitutive equation which includes an aging clock that depends upon the deformation magnitude describes the response. The results are discussed and related to the apparent ‘‘rejuvenation’’ described by Struik in similar thermomechanical histories.
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