Fig. 6. Lap shear bonding test data. (a) Polymer glue is placed between two adherends and pulled to failure: (i) adhesion failure is failure between the adhesive and the surface of the adherends; while (ii) cohesion failure is failure within the adhesive. (b) A photograph of a lap shear test specimen (H1/TA26) after pulling apart. (c) Representative force–extension curves for an adhesive single-lap-joint made from Hx/TAy. Maximum adhesion is indicated by the peak of the extension (in millimeters) versus force (in newtons) plot. (d) The adhesion lap shear strength values of Hx/TAy cured at different ratios. Error bars represent standard deviation from four specimens.