Experimental Study of Three- and Four-Point Shear Test Specimens

    Volume 17, Issue 4 (October 1995)

    ISSN: 0884-6804

    CODEN: CTROAD

    Page Count: 9


    Adams, DF
    Professor and M.S. Candidate, University of Wyoming, Laramie, WY

    Lewis, EQ
    Professor and M.S. Candidate, University of Wyoming, Laramie, WY

    Abstract

    The measured short beam (three-point) shear strength was found to be strongly influenced by the support span-to-specimen thickness l/t ratio, and to a lesser extent, by the specimen thickness and the diameters of the loading and support cylinders. As the l/t ratio decreased, the shear strength increased. Transverse compressive stresses, induced by the support and loading cylinders, may have progressively inhibited shear failures as the separation of the cylinders decreased with decreasing l/t ratio. Nevertheless, shear failure modes were typically observed. Local compressive damage under the loading cylinder was a minor secondary event, if it occurred at all. Similar results were obtained for the four-point shear test specimen configuration. The four-point shear test method yielded shear strengths similar to those for the short-beam shear test for the unidirectional glass/epoxy composite but lower shear strengths for the unidirectional carbon/epoxy composite.


    Paper ID: CTR10454J

    DOI: 10.1520/CTR10454J

    ASTM International is a member of CrossRef.

    Author
    Title Experimental Study of Three- and Four-Point Shear Test Specimens
    Symposium , 0000-00-00
    Committee D30