Volume 16, Issue 4 (October 1994)

    Effect of Through Thickness Tensile and Compressive Stresses on Delamination Propagation Fracture Energy

    CODEN: CTROAD

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    Abstract

    Strain energy release rate criteria are often used for predicting delamination. However, the fracture energy for delamination propagation is not a material constant, but varies depending on the through thickness normal stress. For tensile normal stresses this problem is usually overcome by using a mixed mode fracture criterion. However, the mixed mode approach fails to take into account compressive through thickness normal stresses. These can greatly increase the delamination stress and therefore cannot be simply ignored. A new approach is proposed in which it is assumed that the fracture energy for delamination propagation is a linear function of the average through thickness normal stress. Comparison with experimental results for unidirectional specimens with discontinuous plies shows excellent correlation, and accounts for a number of experimental observations that cannot be explained using the standard fracture mechanics approach.


    Author Information:

    Jones, MI
    Reader and experimental officer, University of Bristol, Bristol,

    Wisnom, MR
    Reader and experimental officer, University of Bristol, Bristol,

    Cui, W
    Senior engineer, China Ship Scientific Research Centre, Wuxi, Jiangsu


    Stock #: CTR10593J

    ISSN: 0884-6804

    DOI: 10.1520/CTR10593J

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    Author
    Title Effect of Through Thickness Tensile and Compressive Stresses on Delamination Propagation Fracture Energy
    Symposium , 0000-00-00
    Committee D30