Errors in crack closure measurements caused by flexure test fixture support effects

Johansson, S. and Fitzpatrick, M. E. (2001). Errors in crack closure measurements caused by flexure test fixture support effects. Experimental Mechanics, 41(1) pp. 47–51.

URL:	http://www.springerlink.com/content/dj176t7146ru11...
DOI (Digital Object Identifier) Link:	https://doi.org/10.1007/BF02323103
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Abstract

Flexural tests are sometimes used for the evaluation of fatigue and fracture properties, especially for thin cross sections such as plate material where compact tension specimens cannot be used, or where material thickness is limited in the direction required for data generation. The method is also useful for evaluation of crack closure provided the force transfer occurs correctly. This paper shows how the inﬂuence of incorrect test ﬁxture supports, which are outside the standard testing arrangement for such test specimens, can affect the force-displacement cur ves as evidenced using the back-face strain method. The results show that incorrect test ﬁxture supports may cause deviations in the force-displacement trace as an artifact of the testing conditions. This effect can severely inﬂuence crack closure measurements. The effect was also modeled with ﬁnite element analysis.

Item Type:	Journal Item
ISSN:	0014-4851
Keywords:	Flexural bend testing; fatigue crack closure; back-face strain; strain gage techniques;
Academic Unit/School:	Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID:	10377
Depositing User:	Michael E. Fitzpatrick
Date Deposited:	18 Feb 2008
Last Modified:	04 Oct 2016 10:08
URI:	http://oro.open.ac.uk/id/eprint/10377
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