Every problem is unique, but our team of expert engineers have collected some of the most frequently asked questions to give you a good idea of the kinds of factors to consider.
Tensile stress is pull perpendicular to the plane and away from the adhesive bond. Force is distributed equally across the entire bond area. (Compression stress is in the opposite direction, where the substrates are pushed together perpendicular to the bond plane.)
Shear stress is pull directed across the adhesive, forcing the substrates to slide past one another. Here the force is in the same plane as the bond and distributed across the entire area.
Cleavage stress is concentrated at one edge of the joint, exerting a prying force on the bond as the substrates separate. While that end of the adhesive joint is experiencing concentrated stress, the other edge of the joint is theoretically under zero stress. Cleavage occurs between two rigid substrates.
Peel is also concentrated at one edge of the joint. At least one of the substrates is flexible, resulting in even more concentration at the leading edge than with cleavage stress.