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Mechanical behavior assessment of sucrose using nanoindentation

Published online by Cambridge University Press:  31 January 2011

K.J. Ramos  and
D.F. Bahr
K.J. Ramos
Affiliation:
Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164
D.F. Bahr*
Affiliation:
Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164
*
a)Address all correspondence to this author. e-mail: dbahr@wsu.edu
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Abstract

An experimental study of the elastic and plastic properties of sucrose single crystals, which can be considered to be a model material for both pharmaceutical excipients and explosives, has been carried out using nanoindentation. Instrumented indentation was used to characterize the properties of both habit and cleavage planes on the (100) and (001) orientations; the elastic modulus on the (100) is 38 GPa, while the modulus on the (001) is 33 GPa. The hardness of sucrose is approximately 1.5 GPa. Nanoindentation enables assessment of the onset of plastic deformation on cleaved surfaces, and a maximum shear stress of 1 GPa can be supported prior to plastic deformation. The deformation in this material is crystallographically dependent, with pileup around residual indentation impressions showing evidence of preferential slip system activity.

Keywords

DislocationsOrganicStress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 7 , July 2007 , pp. 2037 - 2045
Copyright
Copyright © Materials Research Society 2007

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