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Errors in crack closure measurements caused by flexure test fixture support effects
Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Engineering Materials .
Linkoping Univ, Dept Mech Engn, Div Engn Mat, S-58183 Linkoping, Sweden Open Univ, Dept Mat Engn, Milton Keynes MK7 6AA, Bucks, England.
2001 (English)In: Experimental mechanics, ISSN 0014-4851, Vol. 41, no 1, 47-51 p.Article in journal (Refereed) Published
Abstract [en]

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 curves 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.

Place, publisher, year, edition, pages
2001. Vol. 41, no 1, 47-51 p.
Keyword [en]
flexural bend testing, fatigue crack closure, back-face strain, strain gage techniques
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-49376OAI: diva2:270272
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-13

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