ABSTRACT
The reason for this difference is the incomparable stress of the coating bond by a uniaxial tensile load at the determination of the pull-off strength in contrast to a peel stress between coating and substrate at the development of a blister. Both these basically different stress states at the determination of the pull-off strength as well as at the delamination of a coating are schematically presented below in figure 2. At a developing blister, the illustrated peel stresses do not occur only in one direction, they appear, however, in an axially symmetric way as a result of the circular shape of the blister.
