Time-aging time-stress superposition in soft glass under tensile deformation field

Shaukat, Asima ; Sharma, Ashutosh ; Joshi, Yogesh M. (2010) Time-aging time-stress superposition in soft glass under tensile deformation field Rheologica Acta, 49 (11-12). pp. 1093-1101. ISSN 0035-4511

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Official URL: http://www.springerlink.com/content/0447wkx85q2582...

Related URL: http://dx.doi.org/10.1007/s00397-010-0469-2

Abstract

We have studied the tensile deformation behaviour of thin films of aging aqueous suspension of Laponite, a model soft glassy material, when subjected to a creep flow field generated by a constant engineering normal stress. Aqueous suspension of Laponite demonstrates aging behaviour wherein it undergoes time-dependent enhancement of its elastic modulus as well as its characteristic relaxation time. However, under application of the normal stress, the rate of aging decreases and in the limit of high stress, the aging stops with the suspension now undergoing a plastic deformation. Overall, it is observed that the aging that occurs over short creep times at small normal stresses is the same as the aging that occurs over long creep times at large normal stresses. This observation allows us to suggest an aging time-process time-normal stress superposition principle, which can predict rheological behaviour at longer times by carrying out short time tests.

Item Type:Article
Source:Copyright of this article belongs to Springer.
Keywords:Soft Glass Material; Aging; Thixotropy; Laponite
ID Code:47028
Deposited On:06 Jul 2011 11:08
Last Modified:06 Jul 2011 11:08

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