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Pressure sensitive flow and constraint factor in amorphous materials below glass transition

Published online by Cambridge University Press:  31 January 2011

K. Eswar Prasad ,
V. Keryvin  and
U. Ramamurty
K. Eswar Prasad
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India
V. Keryvin
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India; and LARMAUR, EA 410, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France
U. Ramamurty*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India
*
a) Address all correspondence to this author. e-mail: ramu@materials.iisc.ernet.in
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Abstract

The constraint factor, C (given by the hardness-yield strength ratio H/Y in the fully plastic regime of indentation), in metallic glasses, is greater than three, a reflection of the sensitivity of their plastic flow to pressure. Furthermore, C increases with increasing temperature. In this work, we examine if this is true in amorphous polymers as well, through experiments on amorphous poly(methyl methacrylate) (PMMA). Uniaxial compression as well as spherical indentation tests were conducted in the 248–348 K range to construct H/Y versus indentation strain plots at each temperature and obtain the C-values. Results show that C increases with temperature in PMMA as well. Good correlation between the loss factors, measured using a dynamic mechanical analyzer, and C, suggest that the enhanced sensitivity to pressure is possibly due to β-relaxation. We offer possible mechanistic reasons for the observed trends in amorphous materials in terms of relaxation processes.

Keywords

AmorphousHardnessPolymer
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 890 - 897
Copyright
Copyright © Materials Research Society 2009

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