Abstract
A design method accounting for the time-dependent fracture of structural adhesive joints is proposed. For both a mineral-filled epoxy and a rubber-toughened epoxy, it is demonstrated that a wedge test may be used to estimate an effective threshold energy release rate for no crack growth in planar structural adhesive joints under the full range of mode ratios. Using viscoelastic fracture mechanics, and experimental results from creep tests and constant energy release rate tests, it is shown that the energy release rates measured from the wedge tests are not sufficiently low for design with no creep crack growth. Crack speeds as a function of the applied energy release rates are reduced from the wedge test data, and it is demonstrated with theory and experimental results how the mode I wedge test data may be extended for designing adhesive joints over a wide range of mode ratios.
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