Journal
POLYMER TESTING
Volume 43, Issue -, Pages 108-122Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2015.03.004
Keywords
Three-point bending; Five-point bending; Two-sense bending test
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A novel two-sense support for flexural tests has been designed and manufactured in Ikerlan. The aim of this support is to do two-sense bending fatigue tests. In order to reduce the displacement corresponding to a given stress, a novel test configuration, designated as five-point bending, is modelled analytically. Basically, it is a three-point configuration with two supports at the ends that exert forces in the same sense as the applied load. In this way, a partial clamping is obtained that can be modelled by concentrated loads. The model has been checked carrying out quasi-static three-point and five-point bending tests at different spans in unidirectional carbon/epoxy composite specimens. Flexural modulus and the out-of-plane shear modulus have been obtained by linear regression in both cases, after having obtained experimentally the stiffness of the system. (C) 2015 Elsevier Ltd. All rights reserved.
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