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Compressive strength of composite laminates with delamination-induced interaction of panel and sublaminate buckling modes


Reference:

Rhead, A. T., Butler, R. and Hunt, G. W., 2017. Compressive strength of composite laminates with delamination-induced interaction of panel and sublaminate buckling modes. Composite Structures, 171, pp. 326-334.

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    Official URL:

    https://doi.org/10.1016/j.compstruct.2017.03.011

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    Abstract

    Compression After Impact (CAI) strength is critical to the safety and weight of carbon fibre aircraft. In this paper, the standard aerospace industry practice of using separate analyses and tests for panel buckling and CAI strength is challenged. Composite panels with a range of stacking sequences were artificially delaminated and subject to compression testing in a fixture that allowed local sublaminate and global panel buckling modes to interact. Compared to panels without delamination, interaction of buckling modes reduced panel buckling strains by up to 29%. Similarly, compared to delaminated panels restrained against panel buckling, interaction reduced delamination propagation strains by up to 49%. These results are the first to indicate that restriction of interaction during CAI testing is unconservative and therefore potentially unsafe. A novel integration of an analytical Strip model, for sublaminate buckling driven delamination propagation, and a Shanley model, for determining increased local strain due to sublaminate-buckling-induced panel curvature, is used to calculate the reduction in strength due to buckling mode interaction. Assuming a typical sublaminate post to pre-buckling stiffness ratio of 0.65, the difference in integrated model and experimental results is <11% – a level of accuracy that will allow the integrated model to drive initial design studies.

    Details

    Item Type Articles
    CreatorsRhead, A. T., Butler, R. and Hunt, G. W.
    DOI10.1016/j.compstruct.2017.03.011
    Related URLs
    URLURL Type
    http://www.scopus.com/inward/record.url?scp=85015826147&partnerID=8YFLogxKUNSPECIFIED
    https://doi.org/10.1016/j.compstruct.2017.03.011Free Full-text
    Uncontrolled Keywordsbuckling,compression after impact,delamination,strength,ceramics and composites,civil and structural engineering
    DepartmentsFaculty of Engineering & Design > Mechanical Engineering
    Research CentresEPSRC Centre for Doctoral Training in Statistical Mathematics (SAMBa)
    RefereedYes
    StatusPublished
    ID Code55388

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