SYMPOSIA PAPER Published: 01 January 1997

Experimental Compliance Calibration for the Mixed-Mode Bending (MMB) Specimen


A novel method to control the mixed-mode bending (MMB) specimen is presented. By maintaining a constant opening, or Mode I, displacement rate, stable delamination growth is achieved for all mixed-mode ratios. A constant-opening displacement rate is achieved by attaching a second displacement transducer to the hinges of the specimen. The test machine is then controlled externally by the second displacement transducer. By achieving stable delamination growth and monitoring the opening displacement, an experimental compliance calibration may be derived for the Modes I and II parts. This new approach to control the test and determine the experimental compliance calibration, overcomes the potential inaccuracies of the previously used beam theory expressions to determine compliance and to separate the modal values of G.

Author Information

Martin, RH
Materials Engineering Research Laboratory, Hertford, UK
Hansen, PL
Materials Engineering Research Laboratory, Hertford, UK
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Developed by Committee: D30
Pages: 305–323
DOI: 10.1520/STP19934S
ISBN-EB: 978-0-8031-5353-0
ISBN-13: 978-0-8031-2411-0