Abstract
Moisture-assisted crack growth at various polymer/glass interfaces was measured as a function of applied strain energy release rate and relative humidity using a four-point flexure apparatus coupled with an inverted microscope. The specimens consisted of two glass plates bonded together with a thin layer of commercially available epoxy-acrylate, urethane-acrylate or epoxy adhesive. The crack front at the epoxy-acrylate and epoxy interfaces was relatively smooth and, above a threshold strain energy release rate, the crack growth rate was dependent on the applied strain energy release rate via a power law relationship. Crack growth along the urethane-acrylate interface was characterized by the development of finger-like perturbations along the advancing crack front. These finger-like perturbations grew until they reached a steady-state length. Once the fingers reached steady-state, the crack growth rate of the overallcrack front was dependent on the applied strain energy release rate via a power law function. With all the polymer adhesives crack growth rates increased with higher relative humidities.
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