Figure 1. Adhesive Failure Modes (a) Adhesion Failure (b) Adhesion/Cohesion Failure (c) Cohesion Failure and (d) Substrate Failure

From

Variation of Adhesive Strength in Single Lap Joint (SLJ) with Surface Irregularities

Aditya V. Natu, Ankit R. Sharma, Nitinkumar R. Anekar

American Journal of Mechanical Engineering. 2019, 7(2), 61-67 doi:10.12691/ajme-7-2-2