A constant load-point displacement rate method is used to test double-cantilever-beam specimens of 2024-T3 aluminium alloy bonded with AF126 adhesive. The elastic energy release rate, G(1), was calculated from measured values of load and load-point displacement. Measurements in humid air at 50 degrees C showed that G(1) depended strongly on load-point displacement rate. At high rates, the bond was not degraded and G(1) was equivalent to G(1c). At very low rates, the bond was degraded and G(1) was equivalent to G(1scc). In a region between these extremes, G(1) was sensitive to load-point displacement rate because moisture degraded the bond at a rate similar to the crack velocity. Selection of data where G(1) was unstable with load-point displacement rate leads to a crack velocity, which may be used as a bond durability indicator.