JMSC21669 Revised Manuscript.pdf (827.4 kB)
Download file

Investigation of the effect of relative humidity on polymers by depth sensing indentation

Download (827.4 kB)
journal contribution
posted on 03.08.2011, 14:11 authored by Kazim Altaf, Ian A. Ashcroft, Richard J.M. Hague
Stereolithography (SL) resins absorb varying amounts of moisture dependent on the relative humidities, which can significantly affect the mechanical properties. In this work, the influence of relative humidity (RH) on the mechanical behaviour of an SL resin is investigated using depth sensing indentation (DSI). The samples were conditioned by two methods. In the first method, samples were pre-conditioned at 33.5, 53.8, 75.3 and 84.5% RH using saturated salt solutions. These preconditioned samples were tested at 33.5% RH, using a humidity control unit (HCU) to control RH in the DSI system. In the second method, samples were conditioned and tested at 33.5, 53.8, 75.3 and 84.5% RH by regulating humidity in the DSI system using the HCU. Temperature was kept constant at 22.5 C for the conditioning and DSI testing. It was seen that hardness and modulus decreased with increasing RH and conditioning time but recovered significantly when tested after drying. This study demonstrates that RH needs to be taken into account during the DSI testing of polymers.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

ALTAF, K., ASHCROFT, I.A. and HAGUE, R.J.M., 2011. Investigation of the effect of relative humidity on polymers by depth sensing indentation. Journal of Materials Science, 46 (23), pp. 7551-7557.

Publisher

© Springer

Version

AM (Accepted Manuscript)

Publication date

2011

Notes

This article was published in the serial, Journal of Materials Science [© Springer]. The definitive version is available from: http://www.springerlink.com/content/y2g413h8h2l6044m/

ISSN

0022-2461;1573-4803

Language

en