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Advances in Materials Science and Engineering
Volume 2014, Article ID 769206, 8 pages
http://dx.doi.org/10.1155/2014/769206
Research Article

Characterization of Material Stiffness on Injection Moulded Microspecimens Using Different Test Methods

Institute of Polymer Technology, University Erlangen-Nuernberg, Am Weichselgarten 9, 91058 Erlangen, Germany

Received 10 March 2014; Accepted 25 June 2014; Published 10 July 2014

Academic Editor: Steve Bull

Copyright © 2014 Dietmar Drummer et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Injection moulding of polymer microparts can result in modified material behaviour due to process-induced changes in the internal properties. Thus, a transfer of the mechanical material properties in microparts, determined and valid on standardized test specimens, is only partially possible and should be verified on microtest specimens. This paper investigates both tensile and bending test methods for a suitable characterization of material stiffness in polymer microparts. For this purpose a down-scaled standard specimen is used and tested with different testing methods. The investigations reveal that the different testing methods result in comparable mechanical values. The effects of process-induced modified mechanical behaviour are observable in the investigated testing methods. Consequently, a microbending test is potentially a suitable method for characterizing material stiffness using microspecimens.