Answer:
There are many strength associated with adhesive - tensile, compresive, cleavage and peal. Adhesive failure is also determined by some of these factors. When two parts are bonded, they are then tested in a number of ways in order to gather technical information. During the tests a number of results are looked at, such as Cohesion Failur - which is failure of the adhesive, Adhesion failure - which is when the adhesive breaks away from the substartes or parts glued, and finally there is substrate failure - when the material that is being bonded fails....
Hope this helps